Previous Year Questions (2014-19) - Amines Notes | EduRev

Chemistry 28 Years Past year papers for NEET/AIPMT Class 12

NEET : Previous Year Questions (2014-19) - Amines Notes | EduRev

The document Previous Year Questions (2014-19) - Amines Notes | EduRev is a part of the NEET Course Chemistry 28 Years Past year papers for NEET/AIPMT Class 12.
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Q.1. The correct order of the basic strength of methyl substituted amines in aqueous solution is:    (2019)  
A: (CH3)2NH > CH3NH2 > (CH3)3N
B: (CH3)3N > CH3NH2 > (CH3)2NH
C: (CH3)3N > (CH3)2NH > CH3NH2
D: CH3NH2 > (CH3)2NH > (CH3)3N
Ans: A
Solution:

In aqueous solution, electron donating inductive effect, solvation effect (H-bonding) and steric hindrance all together affect basic strength of substituted amines
Basic character:
Previous Year Questions (2014-19) - Amines Notes | EduRev

Q.2. Nitration of aniline in strong acidic medium also gives m-nitroaniline because     (2018)
A: In spite of substituents nitro group always goes to only m-position.
B: In electrophilic substitution reactions amino group is meta directive.
C: In absence of substituents nitro group always goes to m-position
D: In acidic (strong) medium aniline is present as anilinium ion.
Ans: 
D
Solution:

Previous Year Questions (2014-19) - Amines Notes | EduRev
In acidic medium aniline is protonated to form anilinium ion which is metadirecting.

Q.3. Which of the following reactions is appropriate forconverting acetamide to methanamine ?    (2017)
A: Hoffmann hypobromamide reaction
B: Stephens reaction
C: Gabriels phthalimide synthesis
D: Carbylamine reaction
Ans: 
A
Solution:

Previous Year Questions (2014-19) - Amines Notes | EduRev

This reaction is known as hoffmann hypobromamide reaction.

Q.4. The correct statement regarding the basicity of arylamines is :    (2016)
A: Arylamines are generally more basic than alkylamines, because the nitrogen atom in arylamines is sp-hybridized.
B: Arylamines are generally less basic than alkylamines because the nitrogen lone pair electrons are delocalized by interaction with the aromatic ring π electrons system.
C: Arylamines are generally more basic than alkylamines because the nitrogen lone pair electrons are not delocalized by interaction with the aromatic ring π electron system.
D: Arylamines are generally more basic than alkylamines because of aryl group
Ans: 
B
Solution:

In arylamines, lone pair of electrons on nitrogen atom is delocalised over the benzene ring, thus, not available for donation. So, arylamines are less basic than alkylamines.

Q.5. The electrolytic reduction of nitrobenzene in strongly acidic medium produces:    (2015)
A: Aniline
B: p-Aminophenol
C: Azoxybenzene
D: Azobenzene
Ans: B
Solution:

Electrolytic reduction of nitrobenzene in weakly acidic medium gives aniline but in strongly acidic medium, it gives para-amino phenol obviously through the acid catalysed rearrangement of initially formed phenyl hydroxyl amine.

Previous Year Questions (2014-19) - Amines Notes | EduRev

Q.6. In the following reaction, the product (A)    (2014)

Previous Year Questions (2014-19) - Amines Notes | EduRev
A:

Previous Year Questions (2014-19) - Amines Notes | EduRev
B:

Previous Year Questions (2014-19) - Amines Notes | EduRev
C:

Previous Year Questions (2014-19) - Amines Notes | EduRev
D:

Previous Year Questions (2014-19) - Amines Notes | EduRev
Ans: 
B
Solution:

The above reaction is a coupling reaction of aniline with diazonium salt to give azo benzene compound. This coupling reaction takes place at the para-position to - NH2 group of benzene. This reaction act as electrophilic substitution reaction of aniline.
Previous Year Questions (2014-19) - Amines Notes | EduRev

Q.7. Which of the following will be most stable diazonium saltPrevious Year Questions (2014-19) - Amines Notes | EduRev    (2014)
A:Previous Year Questions (2014-19) - Amines Notes | EduRev
B:Previous Year Questions (2014-19) - Amines Notes | EduRev
C:Previous Year Questions (2014-19) - Amines Notes | EduRev
D:Previous Year Questions (2014-19) - Amines Notes | EduRev
Ans: 
D
Solution:

Diazonium salt containing aryl group directly linked to the nitrogen atom is most stable due to resonance stabilization between the benzene nucleus and N-atom.
Previous Year Questions (2014-19) - Amines Notes | EduRev
[Resonance structure of benzene diazonium ion]

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