In a reaction ` A to B` the rate of reaction increases two times on increasing the concentration of the reactant four times, then order of reaction is

Options

A. 0
B. 2
C. `1//2`
D. 4

Answer

C

Explanation

( c ) : (i) `r="k a"^(alpha)` (ii) `2r=k(4" a")^(alpha)" Dividing (ii) by (i)," 4^(alpha)=2" or "2^(2alpha)=2" or "2alpha=1" or "alpha=1//2.`