Aldehydes, Ketones and Carboxylic Acids Test 5

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Aldehydes, Ketones and Carboxylic Acids Test 5

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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.
Arrange the following in the increasing order of reactivity with NH₃.
I. CH₂O
II. CH₃CHO
III. CH₃—CO—CH₃

A
I < II < III < IV

B
IV < III < II < I

C
III < IV < I < II

D
II < I < IV < III

Solution

This is because of steric hindrance because NH₃ attack carbonyl carbon as nucleophile (Sn₂) and then steric hindrance is the main factor.
Question 2
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The major organic product formed in the following reaction is

A

B

C

D

Solution
Question 3
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Which carbonyl compound below gives the reddish orange precipitate with 2, 4-dinitrophenyl hydrazine?

A

B

C

D

Solution

Conjugated aldehydes and ketones give reddish orange precipitate with 2,4-dinitrophenyl hydrazine. Non-conjugated aldehydes and ketones give orange precipitate in the same reaction.
Question 4
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Which carbonyl compound below forms a single semicarbazone when allowed to react with semicarbazide?

A

B

C

D

Solution

It is symmetrical ketone, forms single semicarbazone with semicarbazide. All others are unsymmetrical, forms more than one stereoisomers of semicarbazones in the same reaction.
Question 5
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A hydrocarbon X (C₇H₁₄) on ozonolysis followed by work-up with Zn- H₂O gives C₆H₁₂O as one of the product which on subsequent treatment with KOH/I₂ gives yellow precipitate and salt of a chiral acid. Hence, X could be

A

B

C

D

Solution

Ozonolysis of X gives C₆H₁₂O which has one carbon less than X. Hence, X must contain double bond at terminal carbon.
Question 6
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Which gives more than one oximes on treatment with hydroxylamine?

A

B

C

D

Solution

It is unsymmetrical aldehyde, forms syn and anti oximes with hydroxylamine. All others are symmetrical, forms single oxime
Question 7
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Which forms an unsaturated amine on treatment with cyclopentanone in slightly acidic medium?

A
CH₃NH₂

B
(CH₃)3N

C
NH₃

D

Solution

Secondary amine forms enamine with aldehydes or ketones.
Question 8
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Consider the following reaction,
Q.
X (major) in the above reaction is

A

B

C

D

Solution
Question 9
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What is the final major product Y in the following reaction?

A

B

C

D

Solution
Question 10
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What is the final major product in the following reaction?

A

B

C

D

Solution