Q.With respect to the position of -Cl in the compound CH₃-CH=CH-CH₂-Cl, it is classified as a) Vinyl b) Allyl c) Secondary d) Aralkyl

Organic halogen compounds are sorted along two independent axes. By halogen count: a mono-halo compound carries a single halogen (e.g. bromoethane, C2H5Br), a poly-halo compound carries two or more (e.g. trichloropropane, CCl3-CH2-CH3). By the hybridisation of the halogen-bearing carbon: a Csp3-X bond gives an alkyl halide/haloalkane (CH3I), a benzylic halide (a halogen on the carbon directly attached to a ring, C6H5-CH2-Br), an allylic halide (a halogen on the carbon directly next to a C=C double bond, CH2=CH-CH2-Cl) or an alicyclic halide (bromocyclobutane); a Csp2-X bond instead gives either a vinylic halide (the halogen sits ON a double-bond carbon itself, CH2=CHI) or an aryl halide/haloarene (the halogen sits directly on an aromatic ring, C6H5Cl). The distinction between vinylic/aryl (Csp2-X) and allylic/benzylic (Csp3-X, but adjacent to un …