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Question

Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?
1. CH3CCCH3
2. CH3CH2CH2CH3
3. CH3CH2CCH
4. CH3CH=CH2

A
Bromine in carbon tetrachloride
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B
Bromine in acetic acid
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C
Alk KMnO4
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D
Ammonical silver nitrate
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Solution

The correct option is D Ammonical silver nitrate
(a)Br2 in CCl4 ,
(b)Br2 in CH3COOH and
(c)alkaline KMnO4 will react with all unsaturated compounds ( double bonds and triple bonds) i.e., 1, 3 and 4. While (d)ammonical AgNO3 reacts only with terminal alkynes, because terminal alkynes are more acidic i.e., 3. Hence, compound 3 can be distinguished from 1, 2 and 4 by ammonical AgNO3.

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