MCQ
The $H-$ bonds in solid $HF$ can be best represented as
- A$H-F-H-F-H-F$
- B

- ✓

- D





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($en=$ ethylenediamine)
$AB , A _2$ and $B _2$ are diatomic molecule. If the bond enthalpies of $A _2, B _2$ and $AB$ are in the ratio $1: 0.5: 1$, then the bond enthalpy of $A_2$ is $......\,kJ\,mol ^{-1}$ (Nearest integer)