18.1.1 Hydrocarbons 100 1985 1417 9938912 1825 3080 sp'C-H stretching 1465 993 2965 asymmetric CH 2932 asymmetric CH 2876 symmetric CH3 1643 2845 symmetric CH2 92 1-Pentene CH3 CH2 CH2 CH=CH2 er cr18.1.1 Hydrocarbons