Amines Test

Result

Amines Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Read the passage given below and answer the following questions:
Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH₃ group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH₃ group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH₃ to –C₂H₅ results in change of the order of basic strength.
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion (A): (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃ is the order of basic strength in case of methyl substituted amines.
Reason (R): The inductive effect, solvation effect and steric hindrance of the alkyl group decides the basic strength of alkyl amines in the aqueous state.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

(CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃ is the order of basic strength in case of methyl substituted amines as the inductive effect, solvation effect and steric hinderance of the alkyl group decides the basic strength of alkyl amines in the aqueous state.
Question 2
1 / -0

Read the passage given below and answer the following questions:
Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH₃ group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH₃ group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH₃ to –C₂H₅ results in change of the order of basic strength.
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion (A): Amines behave as a Lewis base.
Reason (R): Amines have an unshared pair of electrons on nitrogen atom.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

Amines behave as a Lewis base as they have an unshared pair of electrons on nitrogen atom.
Question 3
1 / -0

Read the passage given below and answer the following questions:
Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH₃ group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH₃ group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH₃ to –C₂H₅ results in change of the order of basic strength.
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion (A): (C₂H₅) ₂NH > (C₂H₅) ₃N > C₂H₅NH₂ > NH₃ is the order of basic strength in case of ethyl substituted amines.
Reason (R): The change of nature of the alkyl group, does not result in change of the order of basic strength.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

(C₂H₅)₂NH > (C₂H₅)₃N > C₂H₅NH₂ > NH₃ is the order of basic strength in case of ethyl substituted amines. The change of nature of the alkyl group, results in change of the order of basic strength.
Question 4
1 / -0

Read the passage given below and answer the following questions:
Greater is the stability of the substituted ammonium cation, stronger should be the corresponding amine as a base. Thus, the order of basicity of aliphatic amines should be: primary > secondary > tertiary, which is opposite to the inductive effect based order. Secondly, when the alkyl group is small, like –CH₃ group, there is no steric hindrance to H-bonding. In case the alkyl group is bigger than CH₃ group, there will be steric hinderance to H-bonding. Therefore, the change of nature of the alkyl group, e.g., from –CH₃ to –C₂H₅ results in change of the order of basic strength.
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion (A): Greater is the stability of the substituted ammonium cation, stronger is the corresponding amine as a base.
Reason (R): The order of basicity of aliphatic amines is: primary > secondary > tertiary.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

Greater is the stability of the substituted ammonium cation, stronger is the corresponding amine as a base but the inductive effect, solvation effect and steric hinderance of the alkyl group decides the basic strength of alkyl amines in the aqueous state.
Question 5
1 / -0

Read the passage given below and answer the following questions:
Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices :
Assertion (A): Benzene ring is aniline is highly deactivated.
Reason (R): In aniline, the sharing of lone pair of nitrogen with the ring increases the electron density on the ring.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

Benzene ring in aniline is highly activated.
Question 6
1 / -0

Read the passage given below and answer the following questions:
Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices :
Assertion (A): The amino group of aniline is acetylated before bromination.
Reason (R): It is due to the strong deactivating effect of –NH₂ group.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

–NH₂ group of aniline is acetylated before bromination due to the strong activating effect of –NH₂ group.
Question 7
1 / -0

Read the passage given below and answer the following questions:
Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices :
Assertion (A): In aniline –NH₂ group facilitates the electrophilic attack.
Reason (R): It is due to decrease in electron density on the ring.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

In aniline, –NH₂ group facilitates the electrophilic attack because the sharing of lone pair of nitrogen with the ring increases the electron density on the ring.
Question 8
1 / -0

Read the passage given below and answer the following questions:
Benzene ring in aniline is highly activated. This is due to the sharing of lone pair of nitrogen with the ring which results in increase in the electron density on the ring and hence facilitates the electrophilic attack. The substitution mainly takes place at ortho and para positions because electron density is more at ortho and para positions. On reaction with aqueous bromine all the ortho and para positions get substituted resulting in the formation of 2,4,6-tribromoaniline. To get a monobromo compound, the amino group is acetylated before bromination. After bromination, the bromoacetanilide is acid hydrolysed to give the desired halogenated amine.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices :
Assertion (A): In aniline, the substitution mainly takes place at ortho and para positions.
Reason (R): The electron density is more at ortho and para positions.

A
A. Assertion and reason both are correct statements and reason is correct explanation for assertion.

B
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.

C
C. Assertion is correct statement but reason is wrong statement.

D
D. Assertion is wrong statement but reason is correct statement.

Solution

In aniline, the electron density is more at ortho and para positions than meta position, so, the substitution mainly takes place at ortho and para positions.
The above resonating structures of aniline show more electron density at the ortho and para positions.
Question 9
1 / -0

Read the passage given below and answer the following questions :
The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their very high reactivity. Substitution tends to occur at ortho and para positions. If we have to prepare monosubstituted aniline derivative, how can the activating effect of –NH2 group be controlled? This can be done by protecting the –NH2 group by acetylation with acetic anhydride, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substituted amine.
Q. Give the major product of the following reaction:

A

B

C

D
None of the above

Solution
Question 10
1 / -0

Read the passage given below and answer the following questions :
The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their very high reactivity. Substitution tends to occur at ortho and para positions. If we have to prepare monosubstituted aniline derivative, how can the activating effect of –NH2 group be controlled? This can be done by protecting the –NH2 group by acetylation with acetic anhydride, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substituted amine.
Q. Aniline is a resonance hybrid of

A
A. 3 structures

B
B. 6 structures

C
C. 2 structures

D
D. 5 structures

Solution
Question 11
1 / -0

Read the passage given below and answer the following questions :
The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their very high reactivity. Substitution tends to occur at ortho and para positions. If we have to prepare monosubstituted aniline derivative, how can the activating effect of –NH2 group be controlled? This can be done by protecting the –NH2 group by acetylation with acetic anhydride, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substituted amine.
Q. What is the major product A of the following reaction:

A

B

C

D
None of the above

Solution
Question 12
1 / -0

Read the passage given below and answer the following questions :
The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their very high reactivity. Substitution tends to occur at ortho and para positions. If we have to prepare monosubstituted aniline derivative, how can the activating effect of –NH2 group be controlled? This can be done by protecting the –NH2 group by acetylation with acetic anhydride, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substituted amine.
Q. Why is the activating effect of -NHCOCH₃ group in the above reaction less than the activating effect of amino group?

A
A. Due to mesomeric effect of benzene ring.

B
B. Due to inductive effect of alkyl group.

C
C. Due to resonance effect of acetanilide.

D
D. All of the above.

Solution

The lone pair of electrons on nitrogen of acetanilide interacts with oxygen atom due to resonance as shown below
Hence, the lone pair of electrons on nitrogen is less available for donation to benzene ring by resonance. Therefore, activating effect of – NHCOCH₃ group is less than that of amino group.
Question 13
1 / -0

Read the passage given below and answer the following questions:
A mixture of two aromatic compounds (A) and (B) was separated by dissolving in chloroform followed by extraction with aqueous KOH solution. The organic layer containing compound (A), when heated with alcoholic solution of KOH produce C₇H₅N (C) associated with unpleasant odour.
The following questions are multiple choice question. Choose the most appropriate answer:
Q. Direct nitration of an aromatic compounds (A) is not feasible because

A
A. the reaction cannot be stopped at the mononitration stage

B
B. a mixture of o, m and p-nitroaniline is always obtained

C
C. nitric acid oxidises most of the aromatic compounds to give oxidation products along with only a small amount of nitrated products

D
D. all of the above

Solution

Direct nitration of aniline is not a feasible process because nitric acid oxidises most of aniline to give tarry oxidation products along with only a small amount of nitrated products.
Question 14
1 / -0

Read the passage given below and answer the following questions:
A mixture of two aromatic compounds (A) and (B) was separated by dissolving in chloroform followed by extraction with aqueous KOH solution. The organic layer containing compound (A), when heated with alcoholic solution of KOH produce C₇H₅N (C) associated with unpleasant odour.
The following questions are multiple choice question. Choose the most appropriate answer:
Q. What is A?

A
A. C₆H₅NH₂

B
B. C₆H₅CH₃

C
C. C₆H₅CHO

D
D. None of these

Solution

Aniline is an organic compound with the formula C₆H₅NH₂. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine. It is an industrially significant commodity chemical, as well as a versatile starting material for fine chemical synthesis.
Question 15
1 / -0

Read the passage given below and answer the following questions:
A mixture of two aromatic compounds (A) and (B) was separated by dissolving in chloroform followed by extraction with aqueous KOH solution. The organic layer containing compound (A), when heated with alcoholic solution of KOH produce C₇H₅N (C) associated with unpleasant odour.
The following questions are multiple choice question. Choose the most appropriate answer:
Q. The alkaline aqueous layer (B) when heated with chloroform and then acidified give a mixture of isomeric compounds of molecular formula C₇H₆O₂. (B) is

A
A. C₆H₅CHO

B
B. C₆H₅COOH

C
C. C₆H₅CH₃

D
D. C₆H₅OH

Solution

Benzaldehyde is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful. It is a colorless liquid with a characteristic almond-like odor.