Carboxylic Acids Test

Result

Carboxylic Acids Test - 5

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type

Direction : This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Which is the major product in the following reaction?

A

B

C

D

Solution
Question 2
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Consider the following reaction,
Q.
Which of the labeiled C —C bond formation is not possible in the above reaction?

A
only i

B
only ii

C
only iii

D
only iv

Solution

An α-βC —C bond is always formed in aidol reaction .
Question 3
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In a mixed aldoi condensation with ethanal as one aidehyde, which other from the following is expected to give maximum yield of cross condensation product?

A

B

C

D

Solution

Nucleophilic addition at carbonyl carbon of cyclopropane releases angle strain.
Question 4
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In the following reaction,
The major organic product is

A

B

C

D

Solution
Question 5
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Consider the following aldol condensation reaction,
Q.
The nucleophile is

A

B

C

D

Solution

In acid catalysed aldo! condensation, enol acts as a nucleophile.
Question 6
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In the following reaction,
Q.
The major final product is

A
HO —CH₂ —CH₂ —CHO

B

C

D
C(CH₂ OH)₄

Solution

Repeated aidol condensation occur due to very high reactivity of formaldehyde towards nucleophile.
Question 7
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Identify the starting reagent needed to make the following compound by mixed aldol condensation.

A
Benzaldehyde and 3-pentanone

B
Benzaldehyde and 2-pentanone

C
Acetophenone and 2-butanon

D
Acetophenone and butanal

Solution
Question 8
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The incorrect statement regarding aldol condensation is

A
It accomplishes the formation of a new C —C bond

B
The enolate is favoured at equilibrium

C
The key step in the mechanism of base catalysed reaction is attack of α-carbon of an enolate ion on the carbonyl carbo

D
Dehydration of aldol gives α, β-unsaturated carbonyl compound

Solution

Enolate is formed in first fast step which undergo nucleophilic addition in second slow step.
Question 9
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Which of the following could result as a product in the aldol condensation reaction?

A
4-methyl-3-penten-2-on

B
4-methyl-4-penten-2-one

C
4-methyl-5-hexen-2-one

D
3-methyl-4-hexen-2-one

Solution

It is an α, β-unsaturated ketone which can be formed in an aldol condensation followed by dehydration.
Question 10
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What is the major final product of the following sequence of reaction?

A

B

C

D

Solution