Carboxylic Acids Test

Result

Carboxylic Acids Test - 3

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type

Direction (Q, Nos. 1-9) This section contains 9 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Which of the following will give a racemic mixture on reduction with NaBH₄ followed by acid work-up?

A

B

C

D

Solution

NaBH₄ brings about reduction of carbonyls by hydrid e transfer mechanism at planar sp² carbon. Hence, if a chiral carbon is generated, racemic mixture is always produced.
Question 2
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What would be the major product in the following reaction?

A

B

C

D

Solution

LiAIH₄ reduces both carbonyls and carboxylic groups but does not reduce olefinic bond.
Question 3
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Which of the following on reaction with excess of NaHSO₃ in aqueous solution will give mixture of salts which can be separated into two fractions by fractional crystallisation?

A

B

C

D

Solution

In the above reaction, four stereoisomers, two pairs of enantiomers are formed. Each member of a pair of enantiomer is diastereomer of each member of other pair of enantiomer. Hence, fractional crystallisation would give two fractions, each containing racemic mixture.
Question 4
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Which is the most suitable reagent for the following transformation?

A
Zn(Hg)-HCI

B
N₂ H₄ /NaOH/Heat

C
LiAIH₄

D
NaBH₄

Solution

Clemmensen reduction is suitable for reductio n of carbonyls containing additional acidic functional group.
Question 5
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Which is the most suitable reagent for the following transformation?

A
Zn(Hg)-HCI

B
N₂ H₄ /NaOH/Heat

C
LiAlH₄

D
NaBH₄

Solution

Wolff-Kishner reduction is suitable for reduction of carbonyls containing olefinic bonds. If Clemmensen reduction is done, HCI also attacks olefinic bonds.
Question 6
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The reagent which can best bring about the following transformation is

A
LiAIH₄

B
NaBH₄

C
Zn(Hg)-HCI

D
AI[(CH₃ )₂ CHO]₃

Solution

With aluminium isopropoxide (MPV reduction), carbonyls are selectively reduced to alcohols leaving other groups intact.
Question 7
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The most probable product of the following reaction is

A

B

C

D

Solution

If possible, intramolecular reaction is preferred over intermolecular reaction.
Question 8
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Consider the following reaction,
Q.
The most likely organic product X is

A

B

C

D

Solution
Question 9
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Consider the following reaction,
Q.
The most likely organic product X is

A

B

C

D

Solution
Question 10
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Consider the following reaction,

Q.

The organic product(s) formed above is/are

A

B

C

D

Solution

In MPV reduction, carbonyl is reduced to alcohol while isopropoxide fraction of reducing agent is oxidised to acetone.