The molecule CH2 = CH – CH2 – Cl has a halogen attached to an sp3 hybridised carbon, making it an allyl halide. Reason (R) incorrectly states that allyl halides have the halogen attached to an sp2 hybridised carbon, which is why (R) is false.
\( \text{M} \xrightarrow{\text{CH}_3\text{MgBr}} \text{N} + \text{CH}_4 \uparrow \xrightarrow{\text{H}^+} \text{CH}_3\text{COCH}_2\text{COCH}_3 \)