Rule 1:Find the Longest Chain of Consecutive Carbons. 2 The longest chain is CH,CH, six carbons: CHCH-CH,一CH,-CH 3 4 6 hexane 3-methylhexane o01 PearsonPrertice Hllne Chapter 3 10 Chapter 3 10 Rule 1: Find the Longest Chain of Consecutive Carbons. The longest chain is six carbons: hexane