MCQ
The most abundant element in the universe is thought to be :
- ✓Hydrogen
- BCarbon
- COxygen
- DNitrogen
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Which conformer of above compound is most stable across $C_2 - C_3$ ?
| Substance | $H _{2}$ | $C ($ graphite $)$ | $C _{2} H _{6}( g )$ |
| $\frac{\Delta_{ C } H ^{\Theta}}{ kJmol ^{-1}}$ | $-286.0$ | $-394.0$ | $-1560.0$ |
The enthalpy of formation of ethane is ........ .