\(\mathop {\mathop {Cl - \mathop {\mathop C\limits_| }\limits_{Cl} = \mathop {\mathop C\limits_| }\limits_{Cl} - Cl}\limits_{s{p^2}{\text{ - hybridization}}} }\limits_{{\text{Bond angle }} = {\text{ 12}}{{\text{0}}^{\text{o}}}} \)
$(i)$ $C{H_3}C{H_2}C{H_2}C{H_3}$
$(ii)$ $C{H_3} - CH = CH - C{H_3}$
$(iii)$ $C{H_2} = CH - CH = C{H_2}$
$(iv)$ $H - C \equiv C - H$