Alkyl Groups Three carbons One carbon Two carbons CH3 CH3- CH3-CH2- CH3一CH2一CH2一 CH3-CH- methyl group ethyl group propyl group isopropyl group (or“n-propyl group") Four carbons CH3 CH3 CH3 CH3-CH2-CH2-CH2一 CH3-CH-CH2- CH3-CH2-CH- CH3-C- butyl group isobutyl group sec-butyl group (or“-butyl group") CH3 tert-butyl group (or“t-butyl group") Alkyl Groups