Write down the structural formulas of isomers with a molecular weight of 70. Name all substances.

The 70 molecular weight hydrocarbon is pentene. Its formula, which reflects the quantitative and qualitative composition, is C5H10. The name suggests that it is alkene and has a double bond. Alkenes have three forms of isomerism:
a) the position of the multiple connection:
1. CH2 = CH-CH2-CH2-CH3-pentene-1;
2.CH3-CH = CH-CH2-CH3 – pentene-2.
b) isomerism of the carbon skeleton:
CH2 = C (CH3) -CH2-CH3-2methylbutene-1;
CH3 -C (CH3) = CH-CH3-2methylbutene-2.
c) alkenes and cycloalkanes – isomers:
the isomer of pentene is cyclopentane.