Aldehydes and Ketones Test

Result

Aldehydes and Ketones Test - 6

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Weekly Quiz Competition

Question 1
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Consider the following reaction,

(A pure enantiomer)

Q.

The incorrect statement regarding X is

A
It is an aldehyde

B
Product has inverted configuration at the α-carbon

C
X is a racemic mixture

D
Product can be either laevorotatory or dextrorotatory isomer

Solution

X will be a pure enantiomer of aldehyde.
Question 2
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Consider the following reaction sequence,

Q.

The correct statement regarding X is

A
It has an aldehyde functional group

B
It has a ketone functional group

C
It has both aldehyde and ketone functional groups

D
It has a ketone and an acid functional group

Solution
Question 3
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One or More than One Options Correct Type

Direction : This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (dj, out of which ONE or MORE THAN ONE are correct.

Q.

In which of the following reactions, an aldehyde is formed as major product?

A

B

C

D
All are correct

Solution

(b) In option (b), aldehyde is not formed. When a terminal alkyne is oxidised with KMnO₄ , a carboxylic acid is always formed.
All options are preparation of aldehydes.
Question 4
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In which of the following reactions, ketone is formed as the major organic product?

A

B

C

D
Option A,C are Correct

Solution

If acid derivatives like nitrile, acid chlorid e or ester is taken in excess in Grignard synthesis, second addition of Grignard ’s reagent on carbonyl product does not succeed and carbonyls are obtained as major products.
In option (b), carboxylic acids and in option (d), an aldehyde is formed.
Question 5
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Consider the following reaction,

Q.

The correct statement(s) regarding the above reaction is/are

A
It involves cleavage of sigma C —C bond

B
Product is a dialdehyde

C
Reaction proceeds via cyclic intermediate

D
All are correct

Solution

Trans diastereomer of the above diol does not react due to its inability to form cyclic intermediate.
Question 6
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Consider the reaction mentioned below,

Q.

The expected organic product(s) is/are

A

B

C

D
Option B,C are Correct

Solution

Formylation of double bond (oxo process) occurs. However, the reaction is not regioselective, hence both isomers of aldehyde are formed.
Question 7
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Consider the following reaction,

Q.

Reagent(s) that can bring about the above reaction successfully is/are

A
Pd/BaSO₄

B
[(CH₃ )₂ CHO]₃ AI

C
Li[{(CH₃ )₃ CO}₃ AIH] at - 80 °C

D
Option A,C are Correct

Solution

Both Rosenmund reduction (Pd/BaSO₄ )and reduction with Li[{(CH₃ )CO}₃ AIH] at - 80 °C are effective in reducing acid chlorides into aldehydes.
Question 8
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Comprehension Type

Direction : 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

A hydrocarbon A (C₁₀ H₁₈ ) is capable of showing both enantiomerism as well as diastereomerism. Treatment of A either with HgSO₄ / H₂ SO₄ or B₂ H₆ / H₂ O₂ -NaOH results in the same carbonyl compound B. Also,

C can also be obtained as one of the product in the following reaction.

Q.

What is the most likely structure of B?

A

B

C

D

Solution

Compound A has a triple bond and it is symmetrical because its partially reduced product B gives single ozonolysis product C, Also, A shows both enantiomerism and diastereomerism, it must be

As shown above, A has two chiral carbons but simultaneously, it is symmetrical. Hence, it has both meso and a pair of enantiomers as stereoisomers.
Question 9
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A hydrocarbon A (C₁₀ H₁₈ ) is capable of showing both enantiomerism as well as diastereomerism. Treatment of A either with HgSO₄ / H₂ SO₄ or B₂ H₆ / H₂ O₂ -NaOH results in the same carbonyl compound B. Also,

C can also be obtained as one of the product in the following reaction.

Q.

What is the structure of compound C?

A

B

C

D

Solution

Compound A has a triple bond and it is symmetrical because its partially reduced product B gives single ozonolysis product C, Also, A shows both enantiomerism and diastereomerism, it must be

As shown above, A has two chiral carbons but simultaneously, it is symmetrical. Hence, it has both meso and a pair of enantiomers as stereoisomers.
Question 10
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A hydrocarbon A (C₁₀ H₁₈ ) is capable of showing both enantiomerism as well as diastereomerism. Treatment of A either with HgSO₄ / H₂ SO₄ or B₂ H₆ / H₂ O₂ -NaOH results in the same carbonyl compound B. Also,

C can also be obtained as one of the product in the following reaction.

Consider the reaction given below,

Q.

How many different alcohols are expected?

A
1

B
2

C
3

D
4

Solution

Compound A has a triple bond and it is symmetrical because its partially reduced product B gives single ozonolysis product C, Also, A shows both enantiomerism and diastereomerism, it must be

As shown above, A has two chiral carbons but simultaneously, it is symmetrical. Hence, it has both meso and a pair of enantiomers as stereoisomers.
Question 11
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One Integer Value Correct Type

Direction : This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q.

How many different aldehyde isomers exist for C₅ H₁₀ O ?

A
5

B
4

C
3

D
2

Solution
Question 12
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How many different ketones isomer exist for C₆ H₁₂ O ?

A
1

B
0

C
7

D
8

Solution
Question 13
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How many different alcohol isomers with molecular formula C₅ H₁₂ O can be oxidised to ketones using K₂ Cr₂ O₇ - H₂ SO₄ ?

A
1

B
5

C
4

D
3

Solution

All secondary alcohol isomers can be oxidised to ketones.
Question 14
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If all the ketone isomers of C₆ H₁₀ O are reduced independently with NaBH₄ , how many of them will produce racemic mixture of alcohols?

A
5

B
1

C
3

D
2

Solution

All the above shown ketones on reduction with NaBH₄ will produce racemic mixtures of alcohols. The isomer below already has a chiral carbon, show enantiomerism. A pure enantiomer of this ketone, on reduction with NaBH₄ , will produce pair of diastereomers.
Question 15
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Consider the following reaction,

Q.

How many different diols are expected at the end of the above reaction?

A
1

B
2

C
3

D
4

Solution