The C-H bond distance is the longest in:

Options

A. `C_(2)H_(2)`
B. `C_(2)H_(4)`
C. `C_(2)H_(6)`
D. `C_(2)H_(2)Br_(2)`

Answer

C

Explanation

Bond length decreases with increase in s-character as s-orbital is smaller than p-orbital.
`underset(sp^(3))(C_(2)H_(6)), " "underset(sp)(C_(2)H_(2))," "underset(sp^(2))(C_(2)H_(2))," "underset(sp^(2))(C_(2)H_(2)Br_(2))`
(least s-character)