1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?
A
B
C
D

Explanation

Adipic acid CO2H $$-$$ (CH2)4 $$-$$ CO2H     $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{agent}^{dehydrating}} $$
7 membered cyclic anhydride (Very unstable)
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

The major product of the following reaction is

A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

The major product of the following reaction is :

A
B
C
D

Explanation



NaBH4 reduces both ketone into alcohol and imine into 2o amine but it can't reduce alkene as the reacting species of NaBH4 is H- which can't attack as a nucleophile to alkene as alkene itself is a nucleophile.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

What will be the major product in the following mononitration reaction ?

A
B
C
D

Explanation



Here in the compound $$\pi $$ bond of C = O bond will be at resonance with benzene ring with -M effect. But lone pair of N atom is electron donating group which will make the left benzene ring more active by +M effect than right benzene ring and hence electrophilic substitution reaction will be taken place at ortho- or para- position of left benzene ring. As ortho-product formed is sterically hindered and hence para-product will be major product.

Questions Asked from Aldehydes, Ketones and Carboxylic Acids

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