1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

The compounds A and B in the following reaction are, respectively :

A
A = Benzyl alcohol, B = Benzyl cyanide
B
A = Benzyl chloride, B = Benzyl cyanide
C
A = Benzyl alcohol, B = Benzyl isocyanide
D
A = Benzyl chloride, B = Benzyl isocyanide

Explanation


2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

The major product of following reaction is :

A
RCOOH
B
RCONH2
C
RCHO
D
RCH2NH2

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The major product obtained in the following reaction is :

A
B
C
D

Explanation



Nucleophilicity of NH2 $$>$$ OH
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The major product of the following reaction is

A
B
C
D

Explanation



Alcoholic KOH performs $$\alpha $$ - $$\beta $$ elimination with halides.

The carbon which is attached to Br atom is called $$\alpha $$ carbon.

Here, two $$\alpha $$ carbon presents. Let's call them $$\alpha $$1 and $$\alpha $$2.

In case of $$\alpha $$1 carbon, H elimination can take place either from $$\beta $$1 or $$\beta $$2 carbon. But as we know always more stable product is formed from a reaction. Here if H is removed from $$\beta $$1 carbon then a $$\pi $$ bond is created which will perticipate in resonance with benzene ring and product will be more stable. But if H is removed from $$\beta $$2 carbon then the created $$\pi $$ bond will not perticipate in resonance with benzene ring so product will be less stable.

In case of $$\alpha $$2 carbon, H elimination can take place either from $$\beta $$2 or $$\beta $$3 carbon. But as we know always more stable product is formed from a reaction. Here if H is removed from $$\beta $$2 carbon then a $$\pi $$ bond is created which will perticipate in resonance with the $$\pi $$ bond associated with the $$\alpha $$1 carbon so product will be more stable. But if H is removed from $$\beta $$3 carbon then the created $$\pi $$ bond will not perticipate in any resonance so product will be less stable.

Questions Asked from Compounds Containing Nitrogen

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