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.
Questions Asked from Aldehydes, Ketones and Carboxylic Acids
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
