1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 8th April Morning Slot

The major product of the following reaction is :

A
B
C
D

Explanation

2
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

Phenol on treatment with CO2 in the presence of NaOH followed by acidification produces compound X as the major product. X on treatment with (CH3CO)2O in the presence of catalytic amount of H2SO4 produces:
A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A reacts with Br2 to form product B. A and B are respectively :
A
B
C
D

Explanation

First in presence of OH$-$ ion phenol will donate H+ ion and create phenoxide ion. Then this ion will react with methyl chloroformate and carbon joined with Cl and O will be slightly positive charge due to pulling of electron towards O and Cl atom. This positive charge C atom will join with negative charged O ion in phenoxide ion and create product A.

Product A reacts with Br2 and perform electrofilic aromatic substitution and at para position Br will be added.
4
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

The major product formed in the following reaction is :
A
B
C
D

Explanation

(1)

Here oxygen(O) has lone so it will attach on H+ of HI and H+ will attach with O atom to form oxonium ion.

(2)

As O is more electronegative atom, so it don't want to hold the positive charge so it will break bond to create 2o cation which is stable.

Now with this cation I$-$ ion is added.

(3) $\,\,\,$ On the other oxygen atom similar method is applied.

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