\(2.\) \(\mathop {C{H_3} - \mathop {\mathop {CH - }\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{C{H_3}} C{H_2} - C{H_2} - C{H_3}}\limits_{{\rm{2}} - {\rm{methyl}}\,{\rm{pentane}}} \)
\(3.\) \(\mathop {C{H_3} - C{H_2} - \mathop {\mathop {CH}\limits_{|\,\,\,\,\,\,} }\limits_{\,\,\,C{H_3}} - C{H_2} - C{H_3}}\limits_{{\rm{3}} - {\rm{methyl}}\,{\rm{pentane}}} \)
\(4.\) \(\mathop {C{H_3} - \mathop {\mathop {CH - }\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{C{H_3}} \mathop {\mathop {CH - }\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{C{H_3}} C{H_3}}\limits_{{\rm{2,3}} - {\rm{Dimethyl}}\,{\rm{butane}}} \)
\(5.\) \(\mathop {C{H_3} - C{H_2} - \mathop {\mathop {CH}\limits_{|\,\,\,\,\,\,} }\limits_{\,\,\,C{H_3}} - C{H_2} - C{H_3}}\limits_{{\rm{3}} - {\rm{methyl}}\,{\rm{pentane}}} \)
$' A ^{\prime} \stackrel{ HNO _3}{\longrightarrow} X ^{\prime} \stackrel{ NaBH _4}{\longrightarrow} \underset{\text { Chiral compound }}{\text { } B ^{}}$