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Question
Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?
1. CH3−C≡C−CH3
2. CH3−CH=CH−CH3
3. CH3−CH2C≡CH
4. CH3−CH=CH2
Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?
1. CH3−C≡C−CH3
2. CH3−CH=CH−CH3
3. CH3−CH2C≡CH
4. CH3−CH=CH2
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Solution
The correct option is D Ammonical silver nitrate
Br2 in CCl4, Br2 in CH3 COOH and alk. KMnO4will react with all unsaturated compounds, i.e., 1, 2, 3 and 4 while ammonical AgNO3 reacts only with terminal alkynes because they have acidic hydrogen and hence compound '3' can be distinguished from 1, 2 and 4 by ammonical AgNO3.
CH3CH2C≡CH + [Ag(NH3)2]+NO−3→CH3CH2−C≡C−Ag+↓ + NH+4NO−3 + NH3
Br2 in CCl4, Br2 in CH3 COOH and alk. KMnO4will react with all unsaturated compounds, i.e., 1, 2, 3 and 4 while ammonical AgNO3 reacts only with terminal alkynes because they have acidic hydrogen and hence compound '3' can be distinguished from 1, 2 and 4 by ammonical AgNO3.
CH3CH2C≡CH + [Ag(NH3)2]+NO−3→CH3CH2−C≡C−Ag+↓ + NH+4NO−3 + NH3
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