Aldehydes and Ketones Test

Result

Aldehydes and Ketones Test - 8

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Weekly Quiz Competition

Question 1
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One or More than One Options Correct Type

Direction (Q. Nos. 1-4) 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.

Q.

What is/are expected product(s) in the following reaction?

A
CH₃ CN

B
CH₃ NH —CHO

C
N₂

D
All are correct

Solution
Question 2
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Which of the following form enamine on heating with a secondary amine in weakly acidic medium ?

A

B

C

D
Option B,C are Correct

Solution

Aldehydes and ketones containing α-H form enamines when treated with secondary amine in slightly acidic medium.
Question 3
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The compound(s) which form a pair of diastereomers with hydroxylamine is/are

A

B

C

D
All are correct

Solution

All of these form more than one oxim es with H₂ N —OH
Question 4
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The compound(s) below that gives yellow precipitate with KOH/I₂ is/are

A
CH₃ CH₂ OH

B

C

D
Option A,C are Correct

Solution

Aldehydes and ketones with groups form iodoform with NaOH/I₂ . Besides, aldehydes and ketones, alcohols with group also form iodofom in the same reaction.
Question 5
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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

Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows

The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

Q.

What happens if imine form ation is carried out at very low pH?

A
Reaction occur at very fast rate

B
Amine gets protonated and becomes non-nucleophilic

C
Imine formed gets hydrolysed very easily

D
Imine formed gets protonated favouring backward reaction

Solution

At very low pH (highly acidic condition), amines get protonated and its nucleophilic character is lost.
Question 6
1 / -0.25

Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows

The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

Q.

Which of the following is expected to give more than one imine when treated with CH₃ NH₂ ?

A
CH₃ CHO

B

C
H₂ CO

D
(C₆ H₅ )₂ CO

Solution
Question 7
1 / -0.25

Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows

The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

Q.

What is the product X in the following reaction?

A

B

C

D

Solution
Question 8
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One Integer Value Correct Type

Direction : This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q.

In the following reaction, how many isomers of trioximes are formed?

A
6

B
5

C
4

D
1

Solution

Six isomers (stereoisomers) are possible for X.
Question 9
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Consider the isomeric aldehydes with molar mass 100, if all the isomers (only structural) are treated independently with NH₂ OH, how many of them would give more than two stereomeric oximes?

A
1

B
3

C
4

D
0

Solution

MW = 100 indicates that molecular formula of aldehyde is C₆ H₁₂ O . For obtain ing more than two oximes, aldehyde must exist stereomeric.

All the above has one chiral carbon each. Hence, when reacted with H₂ NOH, forms more than two oximes.
Question 10
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When formaldehyde reacts with ammonia, a typical compound called hexamethylene tetramine is formed. How many six membered rings are present in this compound?

A
0

B
1

C
4

D
9

Solution
Question 11
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The smallest acyclic ketone that gives pair of diastereomers with CH₃ NH₂ in slightly acidic medium has how many carbon atoms?

A
9

B
5

C
4

D
6

Solution

The ketone must contain a chiral carbon.