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# Which of the following compounds does not dissolve in concentrated $H_2SO_4$ even on warming?

$\begin{array}{1 1}(a)\;\text{Ethylene}\\(b)\; \text{Benzene}\\(c)\;\text{Hexane}\\(d)\;\text{Aniline}\end{array}$

$CH_2=CH_2+H_2SO_4\rightarrow CH_3CH_2OSO_3H$
$C_6H_6+H_2SO_4\rightarrow C_6H_5SO_3H+H_2O$
$C_6H_{14}+H_2SO_4\rightarrow$ No reaction
$C_6H_5NH_2+H_2SO_4\rightarrow C_6H_5NH_3^+HSO_4^-$
Thus only hexane $(C_6H_{14})$ does not dissolve in $H_2SO_4$ even on warming
Hence (c) is the correct option.