Write unit of rate constant of following reaction :

$1.$ $\frac {5}{2}$ order

$2.$  $n$ order

If the rate expression for a chemical reaction is given by Rate $ = k{[A]^m}{[B]^n}$

For the hypothetical reaction $2X + G \to Q + 2M$ , the rate expression is $\frac{{d\left[ Q \right]}}{{dt}} = k{\left[ X \right]^2}$ . Which of the following is the most likely mechanism ?

The rate of reaction between two reactants $A $ and $B$ decreases by a factor of $4$ if the concentration of reactant $B$ is doubled. The order of this reaction with respect to reactant $B$ is

Which of the following is correct ?

For a given reaction ${t_{1/2}} = \frac{1}{{Ka}}.$. The order of the reaction is