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Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - NEET MCQ


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21 Questions MCQ Test Topic-wise MCQ Tests for NEET - Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives

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Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 1

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

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 1

This is because of steric hindrance because NH3 attack carbonyl carbon as nucleophile (Sn2) and then steric hindrance is the main factor.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 2

The major organic product formed in the following reaction is

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 2

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Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 3

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

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 3

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.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 4

Which carbonyl compound below forms a single semicarbazone when allowed to react with semicarbazide?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 4

It is symmetrical ketone, forms single semicarbazone with semicarbazide. All others are unsymmetrical, forms more than one stereoisomers of semicarbazones in the same reaction.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 5

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

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 5

Ozonolysis of X gives C6H12O which has one carbon less than X. Hence, X must contain double bond at terminal carbon.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 6

Which gives more than one oximes on treatment with hydroxylamine?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 6

It is unsymmetrical aldehyde, forms syn and anti oximes with hydroxylamine. All others are symmetrical, forms single oxime

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 7

Which forms an unsaturated amine on treatment with cyclopentanone in slightly acidic medium? 

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 7

Secondary amine forms enamine with aldehydes or ketones.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 8

Consider the following reaction,

Q. 

X (major) in the above reaction is

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 8

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 9

What is the final major product Y in the following reaction?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 9

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 10

What is the final major product in the following reaction?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 10

*Multiple options can be correct
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 11

One or More than One Options Correct Type

Direction (Q. Nos. 11-14) 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?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 11

*Multiple options can be correct
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 12

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

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 12

Aldehydes and ketones containing α-H form enamines when treated with secondary amine in slightly acidic medium.

*Multiple options can be correct
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 13

The compound(s) which form a pair of diastereomers with hydroxylamine is/are

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 13

All of these form more than one oxim es with H2N—OH

*Multiple options can be correct
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 14

The compound(s) below that gives yellow precipitate with KOH/I2 is/are

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 14

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

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 15

Comprehension Type

Direction (Q. Nos. 15-17) 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?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 15

At very low pH (highly acidic condition), amines get protonated and its nucleophilic character is lost.

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 16

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 CH3NH2?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 16

Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 17

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?

Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 17

*Answer can only contain numeric values
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 18

One Integer Value Correct Type

Direction (Q. Nos. 18-21) 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?


Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 18


Six isomers (stereoisomers) are possible for X.

*Answer can only contain numeric values
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 19

Consider the isomeric aldehydes with molar mass 100, if all the isomers (only structural) are treated independently with NH2OH, how many of them would give more than two stereomeric oximes?


Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 19

MW = 100 indicates that molecular formula of aldehyde is C6H12O . For obtain ing more than two oximes, aldehyde must exist stereomeric.

All the above has one chiral carbon each. Hence, when reacted with H2NOH, forms more than two oximes.

*Answer can only contain numeric values
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 20

When formaldehyde reacts with ammonia, a typical compound called hexamethylene tetramine is formed. How many six membered rings are present in this compound?


Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 20

*Answer can only contain numeric values
Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 21

The smallest acyclic ketone that gives pair of diastereomers with CH3NH2 in slightly acidic medium has how many carbon atoms?


Detailed Solution for Test: Reactions With Amines, Ammonia, Hydrazine & Its Derivatives - Question 21

The ketone must contain a chiral carbon.

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