MHTCET 5 May 2025 Shift 2 Paper

Concept:Alcohols are classified by the position of the $-\mathrm{OH}$ group relative to a double bond or aromatic ring.Explanation:Crotonyl alcohol is but-2-en-1-ol.Its structure is $\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2}\mathrm{OH}$.The $-\mathrm{OH}$ group is attached to a $\mathrm{sp}^{3}$ hybridised carbon atom.This carbon is directly adjacent to the carbon-carbon double bond.When the hydroxyl group is bonded to a saturated carbon next to a $\mathrm{C}=\mathrm{C}$ bond, the alcohol is called an allylic alcohol.The carbon bearing $-\mathrm{OH}$ is bonded to only one other carbon, so crotonyl alcohol is a primary allylic alcohol.It is not benzylic because no aromatic ring is present.It is not vinylic because the $-\mathrm{OH}$ is not directly attached to the double-bonded carbon.It is not polyhydric because it contains only one $-\mathrm{OH}$ group.Answer:A. Allylic alcohol