Question
Give reason: Ammonia has higher melting and boiling points.
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| Bond | $\triangle _aH/kJ mol^{-1}$ |
| $C-H$ | $400-415$ |
| $N-H$ | $390$ |
| $O-H$ | $460-464$ |
| $C-C$ | $345$ |
| $C-N$ | $290-315$ |
| $C-O$ | $355-380$ |
| $C-Cl$ | $330$ |
| Bond | $\triangle _aH/kJ mol^{-1}$ |
| $C-Br$ | $275$ |
| $O-O$ | $175-184$ |
| $C=C$ | $610-630$ |
| $C≡C$ | $835$ |
| $C=O$ | $724-757$ |
| $C≡N$ | $854$ |