A) 1-butane
B) 1-butyne
C) 2-butene
D) 2-butyne
Correct Answer: B
Solution :
H-atom attached with triple bonded carbon atoms are acidic in nature. The structures of the given compounds are as [a] \[\underset{1-butene}{\mathop{C{{H}_{2}}=CH-C{{H}_{2}}C{{H}_{3}}}}\,\] [b] \[\underset{1-butyne}{\mathop{CH\equiv C-C{{H}_{2}}C{{H}_{3}}}}\,\] [c] \[\underset{2-butene}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\,\] [d] \[\underset{2-butyne}{\mathop{C{{H}_{3}}C\equiv CC{{H}_{3}}}}\,\] Hence, acidic hydrogen is present only in 1-butyne.
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