#### Answer

This equation can be correct.
Hence, option (a) is not correct.

#### Work Step by Step

First-order in $H_{2}$ implies that the power of $[H_{2}]$ is 1 in the rate law.
In the given rate equation, the power of $[H_{2}]$ is 1.
Therefore, this equation can be correct.
Hence, option (a) is not correct.