Which of the following statement(s) is/are true?

${\Delta }_f{H}^o$  (S, monoclinic) $\ne$0

If  $\Delta H_f(H_{2}O,g)$= - 242 kJ/mol; $\Delta H_{vap}$ ($H_{2}O,l$ ) = 44kJ/mol then, ${\Delta }_f{H}^o(O{H}^{-},aq.)$ will be – 142 kJ/ mol

Combustion of hydrocarbons are generally an exothermic process

If dissociation energy of$C{H}_4\left(g\right)$  is 1656 kJ/mol and $C_2{H}_6\left(g\right)$ is 2812 kJ/mol, then value of C – C bond energy will be 328 kJ/mol