……………………… reaction obeys the expresison `t_(1//2) = 1//ka` in chemical kinetics.

Options

A. `1`
B. `0`
C. `3`
D. `2`

Answer

D

Explanation

`t_(1//2) = (1)/(Ka)` for second order reactions.
`t_(1//2) = (1)/(K(a)) rArr t_(1//2) prop (1)/([a]^(1))`
`rArr t_(1//2) prop [a]^(-1)`
Also,
`t_(1//2) prop [a]^(1-n)`
`[a]^(n-1) = [a]^(-1) rArr 1 - n = -1`
`n = 2`