Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?

A
\(^*CH_3-CH_2-Cl\)

B
\(^*CH_3-CH_2-Mg^+Cl^-\)

C
\(^*CH_3-CH_2-Br\)

D
\(^*CH_3-CH_2-CH_3\)

Solution

Order of electronegativity of the attached group is as follows:

Cl > Br > C > Mg

More electronegative group attached to the C will give more positive charge.
Question 2
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Ionic species are stabilized by the dispersal of charge. Which of the following carboxylate ion is the most stable?

A
\(CH_3-\overset{\overset{O}{||}}{C}-O^-\)

B
\(Cl-CH_2-\overset{\overset{O}{||}}{C}-O^-\)

C
\(F-CH_2-\overset{\overset{O}{||}}{C}-O^-\)

D
\(^{^F\backslash}_{_F/}CH-\overset{\overset{O}{||}}{C}-O^-\)

Solution

The stabilsation of carboxylate ion depends on dispersal of negative charge. The negative charge is dispersed by two factors, i.e., +R effect of the carboxylate ion and Inductive effect of the halogens. In all the above structures, +R effect is common but halogen atoms are different. Therefore, dispersal of negative charge depends upon halogen atoms. F is most electronegative, in structure (iv) two F atoms are present and more dispersal of negative charge is there.
Question 3
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Note : Consider the following four compounds for answering questions

I. \(CH_3-CH_2-CH_2-CH_2-\overset{\overset{O}{||}}{C}-H\)

II. \(CH_3-CH_2-CH_2-\overset{\overset{O}{||}}{C}-CH_3\)

III. \(CH_3-CH_2-\underset{\underset{O}{||}}{C}-CH_2-CH_3\)

IV. \(CH_3-\underset{\underset{CH_3}{|}}{CH}-CH_2-\underset{\underset{O}{||}}{C}-H\)

Which of the following pairs are not functional group isomers?

(i) II and III

(ii) II and IV

(iii) I and IV

(iv) I and II

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Solution

Two or more compounds with same molecular formula but different functional groups are called functional isomers. In the given compounds

I. Aldehydic group. II. Ketonic group. III. Ketonic group. IV. Aldehydic group.

Hence II and III, I and IV are not functional isomers
Question 4
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Match the intermediates given in Column I with their probable structure in Column II.

Column I Column II

(i) Free radical (a) Trigonal planar

(ii) Carbocation (b) Pyramidal

(iii) Carbanion (c) Linear

A
(i) → (a), (ii) → (c) (iii) → (b)

B
(i) → (a), (ii) → (a) (iii) → (b)

C
(i) → (a), (ii) → (a) (iii) → (c)

D
(i) → (c), (ii) → (a) (iii) → (b)
Question 5
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Nucleophile is a species that should have

(i) a pair of electrons to donate

(ii) positive charge

(iii) negative charge

(iv) electron deficient species

A
(i),(iv)

B
(ii),(iii)

C
(i),(iii)

D
(i),(ii)

Solution

Nucleophiles are -vely charged or electron rich (lone pair of electrons) species.
Question 6
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by Carious method.

Reason (R): Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.

A
Both A and R are correct and R is the correct explanation of A

B
Both A and R are correct but R is not the correct explanation of A

C
Both A and R are not correct

D
A is not correct but R is correct

Solution

Sulphur is estimated by Carius method in the form of white precipitate of \(BaSO_4\) on heating with fuming and \(BaCl_2 \). If light yellow solid is obtained means impurities are present. It is filtered washed and then dried to get pure \(BaSO_4\).

Question 7

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Match the ions given in Column I with their nature given in Column II.

Column I	Column II
(i) \(CH_3-\underset{..}{\overset{..}{O}}-\overset{\oplus}{C}H-CH_3\)	(a) Stable due to resonance
(ii) \(F_3-C^{\oplus}\)	(b) Destabilized due to inductive effect
(iii) \(CH_3-\underset{CH_3}{\overset{\overset{\overset{CH_3}{\|}}{C^{\ominus}}}{\|}}\)	(c) Stabilized by hyperconjugation
(iv) \(CH_3-\overset{\oplus}{C}H-CH_3\)	(d) A secondary carbocation

(i) → (a), (b), (d) (ii) → (d) (iii) → (b) (iv) → (c), (d)

(i) → (a), (c), (d) (ii) → (b) (iii) → (b) (iv) → (c), (d)

(i) → (a), (b), (d) (ii) → (b) (iii) → (b) (iv) → (c), (d)

(i) → (c), (b), (d) (ii) → (b) (iii) → (b) (iv) → (a), (d)

Question 8
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.

Reason (R): The colored components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

A
Both A and R are correct and R is the correct explanation of A

B
Both A and R are correct but R is not the correct explanation of A

C
Both A and R are not correct

D
A is not correct but R is correct

Solution

In paper chromatography, a special quality paper known as chromatography paper, is used. Chromatography paper contains water trapped in it, which acts as the stationary phase. A strip of chromatography paper spotted at the base with the solution of the mixture is suspended in a suitable solvent or a mixture of solvents. This solvent acts as the mobile phase. The solvent rises up the paper by capillary action and flows over the spot. The paper selectively retains different components according to their differing partition in the two phases. The paper strip so developed is known as a chromatogram. The spots of the separated coloured compounds are visible at different heights from the position of initial spot on the chromatogram.
Question 9
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The branch of chemistry which deals with the separation, identification and quantitative determination of the composition of different substances is called.......... chemistry.

A
Organic

B
Inorganic

C
Analytical

D
Bio
Question 10
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......... chemistry deals with the chemistry of elements other than carbon and of their compounds.

A
Organic

B
Inorganic

C
Physical

D
Bio

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Column I	Column II
(i) Free radical	(a) Trigonal planar
(ii) Carbocation	(b) Pyramidal
(iii) Carbanion	(c) Linear

Organic Chemistry Some Basic Principles and Techniques Test - 10

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Organic Chemistry Some Basic Principles and Techniques Test - 10

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Question 1

\(^*CH_3-CH_2-Cl\)

\(^*CH_3-CH_2-Mg^+Cl^-\)

\(^*CH_3-CH_2-Br\)

\(^*CH_3-CH_2-CH_3\)

Solution

Question 2

\(CH_3-\overset{\overset{O}{||}}{C}-O^-\)

\(Cl-CH_2-\overset{\overset{O}{||}}{C}-O^-\)

\(F-CH_2-\overset{\overset{O}{||}}{C}-O^-\)

\(^{^F\backslash}_{_F/}CH-\overset{\overset{O}{||}}{C}-O^-\)

Solution

Question 3

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Solution

Question 4

(i) → (a), (ii) → (c) (iii) → (b)

(i) → (a), (ii) → (a) (iii) → (b)

(i) → (a), (ii) → (a) (iii) → (c)

(i) → (c), (ii) → (a) (iii) → (b)

Question 5

(i),(iv)

(ii),(iii)

(i),(iii)

(i),(ii)

Solution

Question 6

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

Both A and R are not correct

A is not correct but R is correct

Solution

Question 7

(i) → (a), (b), (d) (ii) → (d) (iii) → (b) (iv) → (c), (d)

(i) → (a), (c), (d) (ii) → (b) (iii) → (b) (iv) → (c), (d)

(i) → (a), (b), (d) (ii) → (b) (iii) → (b) (iv) → (c), (d)

(i) → (c), (b), (d) (ii) → (b) (iii) → (b) (iv) → (a), (d)

Question 8

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

Both A and R are not correct

A is not correct but R is correct

Solution

Question 9

Organic

Inorganic

Analytical

Bio

Question 10

Organic

Inorganic

Physical

Bio

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