In alkyl halides, the halogen atom is bonded to an alkyl group (R).They form a homologous series represented by CnH2n+1X. They arefurther classified as primary, secondary or tertiary according to thenature of carbon to which halogen is attached. If halogen is attached toa primary carbon atom in an alkyl halide, the alkyl halide is calledprimary alkyl halide or 1° alkyl halide. Similarly, if halogen is attachedto secondary or tertiary carbon atom, the alkyl halide is calledsecondary alkyl halide (2°) and tertiary (3°) alkyl halide, respectively.

What is the order of reactivity of halogen and alkyl groups in the dehydrohalogenation ofalkyl halides to give alkenes?

Assertion (A): CH2=CH−CH2−Cl is an example of allyl halideReason (R): Allyl halides are the compounds in which the halogen atom is attached to sp2 hybridised carbon atom.

These are the compounds in which the halogen atom is bonded to ansp3-hybridised carbon atom adjacent to carbon-carbon double bond(C=C) i.e. to an allylic carbon

Haloalkanes containhalogen atom(s) attached to the sp3 hybridised carbonatom of an alkyl group whereas haloarenes containhalogen atom(s) attached to sp2 hybridised carbonatom(s) of an aryl group. Many halogen containingorganic compounds o

The replacement of hydrogen atom(s) in an aliphaticor aromatic hydrocarbon by halogen atom(s) resultsin the formation of alkyl halide (haloalkane) and arylhalide (haloarene), respectively