The above conversion can be carried out by:

Identify the group $R$ in the following reaction:
$CH_3CH_2CHO \xrightarrow[2. H_3O^+]{1. RMgBr} CH_3CH_2CH(OH)CH_2CH_3$
$R$ is:

$m$-chlorobenzaldehyde on reaction with conc. $KOH$ at room temperature gives

Which one of the following will be most readily dehydrated in acidic condition?

Assertion : $2, 2-$ Dimethylpropanal undergoes Cannizzaro reaction with conc. $NaOH$.
Reason : Cannizzaro reaction is a disproportionation reaction.

Identify the correct statement regarding the following sequence of reactions:
$3\text{-methylbut-1-ene}$ $\xrightarrow[(ii) NaBH_4]{(i) Hg(OCOCH_3)_2/H_2O} A$ $\xrightarrow{\Delta, H_2SO_4} B (\text{major alkene})$ $\xrightarrow{O_3/Zn} C + D$