Classify the following compounds as primary,secondary,and tertiary halides.
$(i)$ $1-$Bromobut$-2-$ene
$(ii)$ $4-$Bromopent$-2-$ene
$(iii)$ $2-$Bromo$-2-$methylpropane

(N/A) The classification of alkyl halides is based on the nature of the carbon atom to which the halogen is attached.
$(i)$ $CH_3-CH=CH-CH_2Br$: The $Br$ atom is attached to a primary $(1^{\circ})$ carbon atom. Hence,it is a primary $(1^{\circ})$ halide.
$(ii)$ $CH_3-CH=CH-CH(Br)-CH_3$: The $Br$ atom is attached to a secondary $(2^{\circ})$ carbon atom. Hence,it is a secondary $(2^{\circ})$ halide.
$(iii)$ $(CH_3)_3C-Br$: The $Br$ atom is attached to a tertiary $(3^{\circ})$ carbon atom. Hence,it is a tertiary $(3^{\circ})$ halide.