Correct option is (d) CH3CH=CClCH2CH3
Easy explanation: In CH3CH=CClCH2CH3, the Cl is bonded directly to the C atom of a C-C double bond, and hence it is a vinylic halide. CH3CHClCH3 is an alkyl halide whereas CH2=CHCHCl2 and (CH3)2C=CHCH2Cl are allylic halides.