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Among the following hydrides, which has the largest H-M-H bond angle (M = N, O, S or C)?

1. H2O
2. CH4
3. NH3
4. H2S

Correct answer: CH4

Solution

CH4 has no lone pairs and a regular tetrahedral angle of 109.5 deg, the largest among these; NH3 (107 deg), H2O (104.5 deg) and H2S (~92 deg) all have smaller angles due to lone-pair repulsion.

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