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Among the molecules CH₄, NH₃, and H₂O, which statement is incorrect?

1. The H–C–H angle in CH₄, the H–N–H angle in NH₃, and the H–O–H angle in H₂O are each more than 90°
2. The H–O–H angle in H₂O is greater than the H–C–H angle in CH₄
3. The H–O–H angle in H₂O is less than the H–N–H angle in NH₃
4. The H–C–H angle in CH₄ is greater than the H–N–H angle in NH₃

Correct answer: The H–O–H angle in H₂O is greater than the H–C–H angle in CH₄

Solution

Bond angles: CH4 109.5, NH3 107, H2O 104.5. So 'H-O-H angle > H-C-H angle' (option 1) is the incorrect statement. The stored choice (all angles > 90 degrees) is actually true.

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