Chapter 1
The CH3 carbon is sp3; the double-bond carbons are sp2; the CC−C and CC−H bond angles are approximately 120°; other bond angles are near 109°.
All carbons are sp2, and all bond angles are near 120°.
All carbons except CH3 are sp2.
The CH3 carbon is sp3; the triple-bond carbons are sp; the CC−C and H−CC bond angles are approximately 180°.