$2$-Chloro-$2$-methylpentane on reaction with sodium methoxide in methanol yields $—$.

(a) 

(b) 

(c)  

In which of the following reactions carbon-carbon bond formation takes place?

 $\mathrm{A}\stackrel{{\mathrm{H}}_2/ \mathrm{Raney} \mathrm{Ni}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$ 

 $\mathrm{A}$ is ______.

Alcohols: ($\mathrm{i}$) ${\mathrm{CH}}_{\mathrm{3}}{\mathrm{CH}}_{\mathrm{2}}{\mathrm{CH}}_{\mathrm{2}}\mathrm{OH}$, ($\mathrm{ii}$) ${\mathrm{CH}}_{\mathrm{3}}-\mathrm{CHOH}-{\mathrm{CH}}_{\mathrm{3}}$ and ($\mathrm{iii}$) ${\mathrm{CH}}_{\mathrm{3}}-\mathrm{C} ({\mathrm{CH}}_{\mathrm{3}}) (\mathrm{OH})-{\mathrm{CH}}_{\mathrm{3}}$ were treated with Lucas reagent. What results do you expect at room temperature?