$1.$ $\mathop {C{H_3}C{H_2}C{H_2}C{H_2} - OH}\limits_{{\rm{Butan - 1 - ol}}} $

$2.$ $\mathop {C{H_3} - C{H_2} - \mathop {\mathop {CH}\limits_{|\,\,\,\,} }\limits_{OH} - C{H_3}}\limits_{{\rm{Butan - 2 - ol}}} $

$3.$ $C{H_3} - \mathop {\mathop {{C^ * }}\limits_{|\,\,\,}^{|\,\,} }\limits_{OH}^H - COOH$

$4.$ $\mathop {C{H_3} - \mathop {\mathop {C\, - \,}\limits_{|\,\,\,\,\,\,}^{|\,\,\,\,\,\,\,} }\limits_{OH}^{C{H_3}} C{H_3}}\limits_{2 - {\rm{Methyl - propan - 2 - ol}}} $

$5.$ $\mathop {C{H_3} - O - {C_3}{H_7}}\limits_{{\rm{Methyl}}\,{\rm{propyl}}\,{\rm{ether}}} $

$6.$ $\mathop {{C_2}{H_5} - O - {C_2}{H_5}}\limits_{{\rm{Diethyl}}\,{\rm{ether}}} $

$7.$