We begin to disassemble from the end. We see: hexadiene, therefore, we conclude that there are 6 carbon atoms in the substance. The suffix “diene” tells us that this substance is an alkadiene, which means that there are two double bonds. In what position are these ties? And this is what the numbers in the middle of the name tell us, namely 3 and 4.
2-methyl is a radical that is in the second position.
CH3 – CH (CH3) – CH = C = CH – CH3.
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