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Question

The number of acidic hydrogen atoms in 1-butyne and 2-butyne is respectively.

A
1, 0
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B
0, 1
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C
1, 1
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D
1, 2
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Solution

The correct option is A 1, 0
1-Butyne (CH3CH2CH1CH)
According to the structure. The carbon numbered as 1, in, 1- butyne has a hydrogen attached to it. This carbon atom is 'sp' hybridised, which means it has higher s-character that means higher electronegativity, therefore, the tendency to donate the H+ ion will be higher in 1-butyne.
Hence 1-butyne has one 1 acidic hydrogen.
and in 2-butyne(CH3CHCHCH3), both the carbons involved in triple bonding does not have a hydrogen atom, and the terminal carbon atoms are sp3 hybridised, meaning less 's' character in them, therefore the tendency to donate H+ ion will be less.
Hence 2- butyne has 0 acidic hydrogen.
Hence, correct option is a

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