What is the number of moles of carbon atoms present in n mole molecules of an alkane if it exhibits five structural isomers?

Identify the product ' B ' in the following sequence of reactions.

$$\mathrm{CH}_3 \mathrm{MgBr} \xrightarrow{\mathrm{CdCl}_2} \mathrm{~A} \xrightarrow{\mathrm{CH}_3 \mathrm{COCl}_1} \mathrm{~B}$$

Rate law for the reaction $2 \mathrm{NO}+\mathrm{Cl}_2 \rightarrow 2 \mathrm{NOCl}$ is rate $=\mathrm{k}[\mathrm{NO}]^2\left[\mathrm{Cl}_2\right]$. When will the value of k increase?

Which among the following is haloarene?