Longest Chain The number of carbons in the longest chain determines the base name: ethane,hexane.(Listed in Table 3.2, page 82.) If there are two possible chains with the same number of carbons,use the chain with the most substituents. HC、 CH-CH2-CH3 CH3 H3C-CH2-C- CH CH2-CH2-CH3 CH3 Chapter 3 > Chapter 3 7 Longest Chain • The number of carbons in the longest chain determines the base name: ethane, hexane. (Listed in Table 3.2, page 82.) • If there are two possible chains with the same number of carbons, use the chain with the most substituents. C CH3 CH2 CH3 CH CH2 CH2 CH3 CH CH2 CH3 H3C H3C =>