1
MCQ (Single Correct Answer)

NEET 2016 Phase 2

The correct order of strengths of the carboxylic acids

is
A
I > II > III
B
II > III > I
C
III > II > I
D
II > I > III

Explanation

We know, Acidic strength $$ \propto $$ – I effect

As oxygen is more electron withdrawing (II) and (III) show greater – I effect than (I). Thus, (I) is least acidic. Out of (II) and (III), (II) is more acidic than (III) as distance of O increases from —COOH group and acidic strength decreases.
2
MCQ (Single Correct Answer)

NEET 2016 Phase 1

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is
A
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation
B
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism
C
a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol
D
a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

Explanation

Keto-enol tautomerism is as follows :
3
MCQ (Single Correct Answer)

NEET 2016 Phase 1

Which of the following reagents would distinguish cis-cyclopenta-1-2-diol from the trans-isomer?
A
MnO2
B
Aluminimum isopropoxide
C
Acetone
D
Ozone

Explanation



Trans isomer does not react with acetone as removal of H2O molecule is difficult.
4
MCQ (Single Correct Answer)

AIPMT 2015

Which one of the following esters gets hydrolysed most easily under alkaline conditions?
A
B
C
D

Explanation

Among the substituent attached to the benzene ring, –NO2 group is the most electron withdrawing, thus withdraws electron density from carbonyl carbon thus facilitate the attack of OH ion.

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