Haloalkanes and Haloarenes Test 21

Result

Haloalkanes and Haloarenes Test 21

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Read the passage given below and answer the following questions:

Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of –OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes.

Q. Name the major monohalo product of the following reaction:

A
1-Iodo-1-methyl cyclohexane

B
1-Iodomethyl cyclohexane

C
1-Chloro cyclohexane

D
None of the above

Solution

According to Markovnikov ’s rule, iodine will add to the carbon atom having less number of hydrogen atoms.
Question 2
1 / -0

Read the passage given below and answer the following questions:

Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of –OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes.

Q. Which of the following is halogen exchange reaction?

A
RX → RI + NaX

B

C

D

Solution

RX → RI + NaX
It is halogen exchange reaction as in this reaction both R and Na exchanges halogens.
Question 3
1 / -0

Read the passage given below and answer the following questions:

Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of –OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes.

Q. Complete the reaction:
H₃C-Br + AgF →

A
H₃C-Br + AgF → H₃C-F + AgBr

B
H₃C-Br + AgF → Br-CH₂-F + AgH

C
H₃C-Br + AgF → [Ag(CH₃)]F + Br

D
None of the above

Solution

H₃C-Br + AgF → H₃C-F + AgBr.
Question 4
1 / -0

Read the passage given below and answer the following questions:

Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of –OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes.

Q. 2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane Write the compound which is most reactive towards β-elimination reaction.

A
2-Bromopentane

B
1- Bromopentane

C
2-Bromo-2-methylbutane

D
None of the above

Solution
Question 5
1 / -0

Read the passage given below and answer the following questions:

Alkyl/Aryl halides may be classified as mono, di or polyhalogen compounds depending on one, two or more halogen atoms in their structures. Alkyl halides are prepared by free radical halogenation of alkanes, addition of halogen acids to alkenes and replacement of –OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution to arenes.

Q. Arrange the following compounds in increasing order of their boiling points.

A
(ii) < (iii) < (i)

B
(i) < (ii) < (iii)

C
(iii) < (i) < (ii)

D
(iii) < (ii) < (i)

Solution

Boiling point of (i) is 364 K, boiling point of (ii) is 375 K. boiling point of (iii) is 346 K As the branching increases in the isomeric alkyl halides, the boiling point decreases.
Question 6
1 / -0

Read the passage given below and answer the following questions:

The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.

Q. In this questions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.
Assertion (A): A racemic mixture containing two enantiomers in equal proportions will have zero optical rotation.
Reason (R): This is because the rotation due to one isomer will be cancelled by the rotation due to the other isomer.

A
Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

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

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but Reason is correct statement.

Solution

A racemic mixture is an equimolar mixture of d and l forms. It is optically inactive due to external compensation as rotation of one form is cancelled by other form.
Question 7
1 / -0

Read the passage given below and answer the following questions:

The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.

Q. In this questions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.
Assertion (A): Propan-2-ol is an achiral molecule.
Reason (R): Carbon is called asymmetric carbon or stereocentre.

A
Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

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

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but Reason is correct statement.

Solution

Propan-2-ol is an achiral molecule as it does not contain an asymmetric carbon, as all the four groups attached to the tetrahedral carbon are not different.
Question 8
1 / -0

Read the passage given below and answer the following questions:

The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.

Q. In this 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 stereoisomers related to each other as non-superimposable mirror images are called enantiomers
Reason (R): Enantiomers possess identical physical properties.

A
Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

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

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but Reason is correct statement.

Solution

The stereoisomers related to each other as non-superimposable mirror images are called enantiomers and they possess identical physical properties.
Question 9
1 / -0

Read the passage given below and answer the following questions:

The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.

Q. In this questions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.
Assertion (A): Butan-2-ol is a chiral molecule.
Reason (R): It has 4 different groups attached to carbon atom.

A
Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

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

C
Assertion is correct statement but reason is wrong statement.

D
Assertion is wrong statement but Reason is correct statement.

Solution

Butan-2-ol is a chiral molecule as it has 4 different functional groups attached to the tetrahedral carbon atom.
Question 10
1 / -0

Read the passage given below and answer the following questions:

Aryl halides are extremely less reactive towards nucleophilic substitution reactions due to the following reasons:
(i) In haloarenes, the electron pairs on halogen atom are in conjugation with π-electrons of the ring.
(ii) In haloalkane, the carbon atom attached to halogen is sp³ hybridised while in case of haloarene, the carbon atom attached to halogen is sp² -hybridised.
(iii) In case of haloarenes, the phenyl cation formed as a result of self-ionisation will not be stabilised by resonance.

Q. Which of the following alkyl halides will undergoes S_N1 reaction most readily?

A
(CH₃)₃C—F

B
(CH₃)₃C—Cl

C
(CH₃)₃C—Br

D
(CH₃)₃C—I

Solution

(CH)₃C-I being a tertiary alkyl halide will most readily undergo S_N1 reaction.
Question 11
1 / -0

Read the passage given below and answer the following questions:

Aryl halides are extremely less reactive towards nucleophilic substitution reactions due to the following reasons:
(i) In haloarenes, the electron pairs on halogen atom are in conjugation with π-electrons of the ring.
(ii) In haloalkane, the carbon atom attached to halogen is sp³ hybridised while in case of haloarene, the carbon atom attached to halogen is sp² -hybridised.
(iii) In case of haloarenes, the phenyl cation formed as a result of self-ionisation will not be stabilised by resonance.

Q. Reaction of C₆H₅CH₂Br with aqueous sodium hydroxide follows _______.

A
S_N1 mechanism

B
S_N2 mechanism

C
Any of the above two depending upon the temperature of reaction

D
Saytzeff rule.

Solution

C₆H₅-CH₂ is stable cation so favours the progress of reaction by S_N1 mechanism.
Question 12
1 / -0

Read the passage given below and answer the following questions:

Aryl halides are extremely less reactive towards nucleophilic substitution reactions due to the following reasons:
(i) In haloarenes, the electron pairs on halogen atom are in conjugation with π-electrons of the ring.
(ii) In haloalkane, the carbon atom attached to halogen is sp³ hybridised while in case of haloarene, the carbon atom attached to halogen is sp² -hybridised.
(iii) In case of haloarenes, the phenyl cation formed as a result of self-ionisation will not be stabilised by resonance.

Q. A primary alkyl halide would prefer to undergo ________.

A
S_N1 reaction

B
S_N2 reaction

C
α-Elimination

D
Racemisation

Solution

A primary alkyl halide would prefer to undergo S_N2 reaction.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Haloalkanes and Haloarenes Test 21

Result

Haloalkanes and Haloarenes Test 21

Score

-

Rank

-

SHARING IS CARING

Question 1

1-Iodo-1-methyl cyclohexane

1-Iodomethyl cyclohexane

1-Chloro cyclohexane

None of the above

Solution

Question 2

RX → RI + NaX

Solution

Question 3

H3C-Br + AgF → H3C-F + AgBr

H3C-Br + AgF → Br-CH2-F + AgH

H3C-Br + AgF → [Ag(CH3)]F + Br

None of the above

Solution

Question 4

2-Bromopentane

1- Bromopentane

2-Bromo-2-methylbutane

None of the above

Solution

Question 5

(ii) < (iii) < (i)

(i) < (ii) < (iii)

(iii) < (i) < (ii)

(iii) < (ii) < (i)

Solution

Question 6

Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but Reason is correct statement.

Solution

Question 7

Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but Reason is correct statement.

Solution

Question 8

Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but Reason is correct statement.

Solution

Question 9

Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

Assertion and Reason both are correct statements but Reason is not correct explanation for Assertion.

Assertion is correct statement but reason is wrong statement.

Assertion is wrong statement but Reason is correct statement.

Solution

Question 10

(CH3)3C—F

(CH3)3C—Cl

(CH3)3C—Br

(CH3)3C—I

Solution

Question 11

SN1 mechanism

SN2 mechanism

Any of the above two depending upon the temperature of reaction

Saytzeff rule.

Solution

Question 12

SN1 reaction

SN2 reaction

α-Elimination

Racemisation

Solution

User

Question Analysis

My Perfomance

H₃C-Br + AgF → H₃C-F + AgBr

H₃C-Br + AgF → Br-CH₂-F + AgH

H₃C-Br + AgF → [Ag(CH₃)]F + Br

(CH₃)₃C—F

(CH₃)₃C—Cl

(CH₃)₃C—Br

(CH₃)₃C—I

S_N1 mechanism

S_N2 mechanism

S_N1 reaction

S_N2 reaction