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Q.
Which of the following reagents will be able to distinguish between $1$-butyne and $2$-butyne?
AIPMTAIPMT 1980Hydrocarbons
Solution:
$1 -$ Butyne reacts with $NaNH _{2}$ to give sodium salt while $2$ - butyne does not react. Only terminal alkynes are acidic.
$CH _{3}- CH _{2}- C \equiv C - H \xrightarrow{+ NaNH _{2}}$
$1-$ Butyne
$NH _{3}+ CH _{3}- CH _{2}- C \equiv C ^{ c -} Na ^{\oplus}+ NH _{3}$