heptenes

CH2=CHCH2CH2CH2CH2CH3     hept-1-ene

CH3CH=CHCH2CH2CH2CH3       hept-2-ene

CH3CH2CH=CHCH2CH2CH3       hept-3-ene

CH3CH2CH2CH=CHCH2CH3       hept-3-ene

CH3CH2CH2CH2CH=CHCH3       hept-2-ene

CH3CH2CH2CH2CH2CH=CH2     hept-1-ene