Discussion
The H-C-H bond angle in ethene is
Answer: A
The H-C-H bond angle in ethene is 117.6°.
Each carbon in ethene is sp2 hybridised, so the ideal angle is 120°. The C=C double bond has more electron density than a C-H bond and repels the C-H bonds more strongly, squeezing the H-C-H angle slightly below 120°, to 117.6° (with H-C-C about 121°).
121° is the H-C-C angle, not H-C-H. 110° and 105° are near the sp3 and water-like values, and 119° has no basis in the measured structure.
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