Assertion `:` Acetylene on reacting with sodamide gives sodium acetylide and ammonic.
Reason`:` `sp-`hybridised carbon atoms of acetylene are considerably electronegative.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

a

Explanation

Acetylene on reaction with sodamide gives sodium acetylide
`CH-=CH overset(NaNH_(2))rarrunderset("monosodium acetylide" )(CH-=bar(C)overset(+)(N)a+NH_(3)`
Here formation of sodium acetylide can be explained by `sp-` hydridisation of carbon atom.As we know that an electron in `s-`orbital is more tightly held than in a `p-`orbital . In `sp-`hydridisation, `s-` character is `50%` as compared to `sp^(2)(33%)` or `sp^(3)(25%)`. So, due to large `s-` character the carbond atom is quite electronegative and hence `Na` of `NaNH_(2)` can replace `H_(+)` of `C-H` bond.
Hence assertion and reason both are true and reason is the correct explanation of assertion.