Question
Diethyl ether is not associated with which one of these isomers
$2.$ $\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}}} $
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${N_2}(g) + {O_2}(g) \rightleftharpoons 2NO(g)$
${N_2}{O_4}(g) \rightleftharpoons 2N{O_2}(g)$
${N_2}(g) + 3{H_2}(g) \rightleftharpoons 2N{H_3}(g)$
$STATEMENT-2$: The colour of the compound formed in the reaction of aniline with $\mathrm{NaNO}_2 / \mathrm{HCl}$ at $0^{\circ} \mathrm{C}$ followed by coupling with $\beta$-naphthol is due to the extended conjugation.