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Name the (4th) fourth member of alkene series.

The alkenes are straight-chain hydrocarbons with one double bond per molecule
No.Alkenes,  CnH2n
            
1. ethene       C2H4     CH2=CH2
2. propene     C3H6     CH2=CHCH3
3. but-1-ene    C4H8     CH2=CHCH2CH3
4. pent-1-ene  C5H10    CH2=CHCH2CH2CH3
5. hex-1-ene    C6H12   CH2=CHCH2CH2CH2CH3
6. hept-1-ene   C7H14   CH2=CHCH2CH2CH2CH2CH3
7. oct-1-ene     C8H16   CH2=CHCH2CH2CH2CH2CH2
CH3
8. non-1-ene    C9H18   CH2=CHCH2CH2CH2CH2CH2
CH2CH3
9. dec-1-ene     C10H20  CH2=CHCH2CH2CH2CH2CH2
CH2CH2CH3

Sometimes long chain formulas are abbreviated
e.g. CH2=CHCH2CH2CH2CH2CH2CH3 may be written CH2=CH(CH2)5CH3


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