MHTCET 13 Apr 2026 Shift 1 Paper

Concept:Grignard reagents add to the carbonyl carbon of aldehydes.The type of alcohol formed depends on the structure of the aldehyde used.Explanation:Formaldehyde ($\mathrm{HCHO}$) gives a primary alcohol.Aldehydes other than formaldehyde have the general formula $\mathrm{RCHO}$, where $\mathrm{R}$ is an alkyl group.When $\mathrm{RCHO}$ reacts with a Grignard reagent $\mathrm{R'MgX}$, the alkyl group $\mathrm{R'}$ attacks the carbonyl carbon.An addition product $\mathrm{RCH(OMgX)R'}$ is formed.On hydrolysis, this gives the corresponding alcohol:$$\mathrm{RCHO} + \mathrm{R'MgX} \rightarrow \mathrm{RCH(OMgX)R'} \xrightarrow{\mathrm{H_3O^+}} \mathrm{RCH(OH)R'}$$In the product $\mathrm{RCH(OH)R'}$, the carbon bearing the $-\mathrm{OH}$ group is attached to two alkyl groups, $\mathrm{R}$ and $\mathrm{R'}$.Since this carbon is bonded to two alkyl groups and one hydrogen atom, it is a secondary alcohol.Answer:The correct option is B: Secondary alcohol.