NEET-XII-Chemistry
Previous Year Paper year:2017
Qstn# 1 Next-Qstn
- #1The most suitable method of separation of
1 : 1 mixture of ortho and para-nitrophenols is :
(1) Steam distillation
(2) Sublimation
(3) Chromatography
(4) CrystallisationdigAnsr: 1Ans : (1)
Sol. In O-nitrophenol intra molecular H-Bond present. So Bpt is low where as in p-nitrophenol molecules are
associated by inter molecular H-Bond. So Bpt is high, so o & p-nitrophenol seperated by steam distillation
method
O
H
δ+
N = O
↓ δ-
O
O - nitrophenol
N
O
O ---- H
O
H
NO
O
O ---- H
N O
O
O ---- H
P-nitrophenol