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Question

1o,2o and 3o nitroalkane can be identified
by action of:
  1. HNO3+NaOH (aq.)
  2. ZnCl2+HCl (aq.)
  3. CHCl3+NaOH (aq.)
  4. HNO2+NaOH (aq.)


Solution

The correct option is D HNO2+NaOH (aq.)
Reaction with nitrous acid is used to distinguish between primary, secondary and tertiary nitroalkane. αH is replaced by nitroso group and impart different colour in NaOH solution.

RCH2NO2(1) HNO2−−−−−(2) NaOHRed colour

R2CHNO2(1) HNO2−−−−−(2) NaOHBlue colour

R3CNO2(1) HNO2−−−−−(2) NaOHColour less

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