Aldehydes, Ketones and Carboxylic Acids Test 7

Result

Aldehydes, Ketones and Carboxylic Acids Test 7

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-10) 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(CH₂OH)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
Question 11
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Statement Type
Direction (Q. Nos. 11-14) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Statement I : In aldol condensation, enoiates are nucleophilic and reversibly attack the carbonyl carbon of aldehyde or ketone in the aldoi condensation.
Statement II : An aldoi on refluxing with dilute base gives back the carbonyl compound.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Reversibility of aldol into carbonyls establishes that carbanion nucleophile is formed in first fast reversible step.
Question 12
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Statement I : When a mixture of ethanal and propanal is treated with aqueous Na₂CO₃, four aldol (excluding stereoisomers) are formed.
Statement II : In mixed aldol condensation, two self and two cross condensation products are always formed.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

It would be true only if both carbonyls are capable of forming enolates, i.e. possesses α-H
Question 13
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Statement I : When is treated with dilute base.
is formed.
Statement II : In the given compound, γ-H is most acidic, forms the required enolate.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution
Question 14
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Statement I : In the reaction below,
A single aldol product is formed in 100% yield.
Statement II : Cross aldol product is formed as major product.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Both self-aldol of cyclohexanone (although minor one) and cross aldol are formed.