Aldehydes and Ketones Test

Result

Aldehydes and Ketones Test - 2

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Predict the major product in the given reaction,

A

B

C

D
Both (a) and (b)

Solution
Question 2
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The major organic product in the following reaction is

A

B

C

D

Solution
Question 3
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What is the major product in the following reaction ?

A

B

C

D

Solution
Question 4
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The major organic product in the following reaction is

A

B

C

D

Solution
Question 5
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In the reaction given below,
Q.
The final major product is

A

B

C

D

Solution
Question 6
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One or More than One Options Correct Type

Direction (Q. Nos. 6-9) This section contains 4 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

In the reaction given below,

Q.

which reagent(s) below would undergo addition at olefinic bond?

A
HCl

B
NH₃

C
CH₃ MgBr

D
NaH

Solution

Weak nucleophiles (Cl , NH₃ ) undergo conjugate addition. Strong nucleophiles (R^- , H^- ) undergo direct addition.
Question 7
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In the reaction given below,

Q.

which reagent(s) will bring about nucleophilic addition at carbonyl carbon?

A
NH₃

B
HBr

C
CH₃ MgBr

D
CH₃ Li

Solution

Strong nucleophiles (CH₃ MgBr, CH₃ Li) undergo direct addition.
Question 8
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What is/are true about nucleophilic addition reaction at α, β-unsaturated carbonyl compound of type

A
LiAIH₄ brings about addition at carbonyl carbon

B
(CH₃ )₂ CuLi brings about addition at conjugate (olefinic) position

C
CH₃ NH₂ brings about conjugate (olefinic) addition

D
All are correct

Solution

Strong nucleophiles (like H^- from LiAIH₄ ) un dergo direct addition while weak nucleophiles (like R₂ CuLi, RNH₂ etc.) undergo conjugate addition at olefinic bond.
Question 9
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Consider the following reaction,

Q.

The correct stalement(s) regarding mechanism of the above reaction and the reaction outcome is/are

A
The indicated product is major one

B
The reaction proceeds by nucleophilic attack of acid at protonated carbonyl at conjugate position

C
Some aldol product is also formed

D
Some .cyclic ester is also formed

Solution

CH₃ COOH undergoes nucleophilic addition at conjugate position giving indicated product as major one.
Question 10
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Comprehension Type
Direction (Q. Nos. 10-12) This section contains a paragraph, describing theory, experiments, data, etc.
Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
Passage
Consider the following multistep synthesis :

Q.
The hydrocarbon X is

A
C₂ H₄

B
C₂ H₂

C

D

Solution

Y has 2 carbon extra than unsaturated ketone, hence starting compound must be acetylene and nucleophile undergoing conjugate addition is
Question 11
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Consider the following multistep synthesis :

Q.
The structure of compound Y is

A

B

C

D

Solution
Question 12
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Consider the following multistep synthesis :

Q.
If X is replaced by pentane -2 ,4 -dione, product equivalent to Y would be

A

B

C

D

Solution
Question 13
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One Integer Value Correct Type

Direction (Q. Nos. 13-15) This section contains 3 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q.

In the reaction given below, how many different stereoisomers of major product are possible?

A
4

B
3

C
2

D
1

Solution
Question 14
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In the reaction given as,

some of the hydrogen undergo exchange by deuterium. At the most, how many deuterium atoj*is incorporation are possible per molecule of keton ?

A
1

B
2

C
3

D
8

Solution
Question 15
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Consider the following sequence of reaction,

Q.

How many different stereoisomers of diol are formed ?

A
1

B
3

C
8

D
9

Solution