bond strength-a bond between an sp2 carbon and an sp3 carbon is stronger than a bond between two sp3 carbons. p3-p2 sp3-sp2 sp3-sp3 sp3-sp2 CH3一CH=CH一CH3 CH3一CH2一CH=CH2 2-Butene 1-Butene (more stable) (less stable) C2004 Thomson-Brooks/Cole„ bond strength – a bond between an sp 2 carbon and an sp 3 carbon is stronger than a bond between two sp 3 carbons