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.
2
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.
3
MCQ (Single Correct Answer)
AIPMT 2015 Cancelled Paper
An organic compound 'X' having molecular formula C5H10O yields phenylhydrazone and gives negative response to the iodoform test and Tollens' test. It produces n-pentane on reduction. 'X' could be
A
3-pentanone
B
n-amyl alcohol
C
pentanal
D
2-pentanone
Explanation
As the compound X yields phenyl hydrazone
and gives negative response to the iodoform test
and Tollen’s test so it must contain a C = O group
but neither a methyl ketone nor in aldehyde.
Thus, the structure of X will be
4
MCQ (Single Correct Answer)
AIPMT 2015
Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is
A
hydrazine in presence of feebly acidic solution
B
hydrocyanic acid
C
sodium hydrogen sulphate
D
a Grignard reagent.
Explanation
Carbonyl compounds react with ammonia
derivatives in weakly acidic medium as follows :
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
