Assertion : Each carbon in ethylene molecule is `sp^(2)` hybridised.
Reason : The H-C-H bond angle in ethylene molecule is `120^(@)`.

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

Answer

B

Explanation

Each carbon atom in ethylene is attached to two hydrogen atoms by single covalent bonds and to another carbon atoms by a double bond. Since each carbon is attached to three other atoms, it uses `sp^(2)` hybrid orbitals and an unhybridised `p_(z)` orbitals to form its bond. Each C-H bond is a `sigma` bond resulting from the overlap of 1 s orbital of hydrogen atom and `sp^(2)` orbital of a carbon atom. One C-C bond results from the linear overlap of `sp^(2)` orbitals one from each carbon atoms. One `pi` bonds results from the lateral overlap of two unhybridised `p_(z)` orbitals, one from each carbon atom.