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Standard XII
Chemistry
Question

The balance chemical equations for the following :
Reaction between 1, 2 - dibromoethane & alcoholic potassium hydroxide.
  1. CH2Br−CH2Bralc.KOH−−−−−→CH3−CH2BrNaNH2−−−−−→CH≡CH
  2. CH2Br−CH2Bralc.KOH−−−−−→CH2Br−CHBrNaNH2−−−−−→CH≡CH
  3. CH2Br−CH2Bralc.KOH−−−−−→CH2=CHBrNaNH2−−−−−→CH≡CH
  4. CH3−CH2BrNaNH2−−−−−→CH2=CH2

A
CH2Br−CH2Bralc.KOH−−−−−→CH3−CH2BrNaNH2−−−−−→CH≡CH
B
CH2Br−CH2Bralc.KOH−−−−−→CH2Br−CHBrNaNH2−−−−−→CH≡CH
C
CH2Br−CH2Bralc.KOH−−−−−→CH2=CHBrNaNH2−−−−−→CH≡CH
D
CH3−CH2BrNaNH2−−−−−→CH2=CH2
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Solution
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Reaction:
CH2Br−CH2Bralc.KOH−−−−−→CH2=CHBrNaNH2−−−−−→CH≡CH ethyne
The given reaction is used to form alkyne from alkyl dihalide. It uses reducing agents like KOH and sodamide. It first undergoes β elimination reaction to form vinyl halide which further undergoes dehydrohalogenation to form alkyne.

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