Assertion `: H_(2)` molecule is more stable than `He-H ` molecule .
Reason `:` The antibonding electron in `He-H` molecule decreases the bond order thereby the stability.

Options

A. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`
B. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`
C. If `(A)` is correct but `(R )` is incorrect
D. If `(A)` is incorrect but `(R )` is correct

Answer

A

Explanation

Bond order of `H_(2) =1` (Two electrons , `sigma 1s^(2)`).
Bond order of `HeH = 0.5` (Three electrons, `sigma 1s^(2),sigma^(**)1s^(1)`) .