C8H16: H3C-(CH2)6-CHC4H6: HC≡C-CH=CHC3H8: H3C-CH2-CHC9H12: H3C-(CH2)7-CHC5H12: H3C-(CH2)3-CHC4H8: H2C=CH-CH2-CH3
C8H16: H3C-(CH2)6-CH
C4H6: HC≡C-CH=CH
C3H8: H3C-CH2-CH
C9H12: H3C-(CH2)7-CH
C5H12: H3C-(CH2)3-CH
C4H8: H2C=CH-CH2-CH3