NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
1

NEET 2016 Phase 2

MCQ (Single Correct Answer)
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

NEET 2016 Phase 1

MCQ (Single Correct Answer)
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

NEET 2016 Phase 1

MCQ (Single Correct Answer)
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

AIPMT 2015

MCQ (Single Correct Answer)
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.

Joint Entrance Examination

JEE Main JEE Advanced WB JEE

Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

Medical

NEET

CBSE

Class 12