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Q.
Which of the following hydrocarbons has acidic hydrogen's?
Chhattisgarh PMTChhattisgarh PMT 2010
Solution:
H-atom attached with triple bonded carbon atoms are acidic in nature.
The structures of the given compounds are as
[a] $ \underset{1-\text{butene}}{CH_{2}=CH-CH_{2}CH_{3}} $
[b] $ \underset{1-\text{butyne}}{CH\equiv C-CH_{2}CH_{3}} $
[c] $ \underset{2-\text{butene}}{CH_{3}CH=CHCH_{3}} $
[d] $ \underset{2-\text{butyne}}{CH_{3}C\equiv CCH_{3}} $
Hence, acidic hydrogen is present only in $1$-butyne.