Hidrocarbura este \(C_7H_{12}\), iar formulele plane ale izomerilor cu atomi de carbon sp pot fi notate astfel:
1. Izomer 1: 2-metilpentan (CH3-CH(CH3)-CH2-CH2-CH2-CH3)
2. Izomer 2: 3-metilpentan (CH3-CH2-CH(CH3)-CH2-CH2-CH3)
3. Izomer 3: 2,2-dimetilbutan (CH3-C(CH3)2-CH2-CH3)