Chemistry - Chemical Kinetics Question with Solution | TestHub

The decomposition of acetaldehyde (${\text{CH}}_3\text{CHO}$) is a well-known example of a fractional order reaction.

The experimentally determined rate law for this reaction is given by:

$\text{Rate}=k[{\text{CH}}_3\text{CHO}{]}^{1.5}$

Thus, the overall order of the reaction is $1.5$, which is a fractional value.

For the other given reactions:
Decomposition of ${\text{H}}_2{\text{O}}_2$ is a first-order reaction.
Formation of $\text{HI}$ from ${\text{H}}_2$ and ${\text{I}}_2$ is a second-order reaction.
Reaction between $\text{NO}$ and ${\text{H}}_2$ is a third-order reaction.

Answer: ${\text{CH}}_3\text{CHO}\text{(g)}⟶{\text{CH}}_4\text{(g)}+\text{CO}\text{(g)}$