Suggest explanations for the following trends in data.
(a) In gas-phase CH4, NH3 and H2O, ∠H—C-H = 109.5°, ∠H—N—H = 106.7° and ∠H-O-H = 104.5°.
(b) The dipole moments (in the gas phase) of NH3 and NH2OH are 1.47 and 0.59 D.
(c) The ratios of ΔvapH:bp for NH3, N2H4, PH3, P2H4, SiHj and Si2H6 are, respectively 97.3, 108.2, 78.7, 85.6, 75.2 and 81.9JK-1 mol-1. However, for HCO?H, the ratio is JK-1 mol-1
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