What is isoheptenes?

Answer 1

A branches alkene of seven carbons. e.g.

CH3-CH=CH-CH(CH3)-CH2-CH3

In modern nomenclature this is 3-methyl-hex-2-ene

It is an iso-heptene.

Answer 2

Isoheptenes are a group of isomeric hydrocarbons with a chain length of seven carbons and a double bond in the molecule. They are commonly used in the production of synthetic rubber and other petrochemical products due to their chemical properties.