IUPAC name of $C H_{3} - C H = C H - C H_{3}$

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2-butene

Symmetrical dimethyl ethylene

1,2- dimethylethene

Unsymmetrical dimethyl ethylene

answer is B.

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Detailed Solution

To get over issues brought on by arbitrary naming, organic chemists developed and utilise the IUPAC nomenclature system. Given these guidelines and structural formulas, one ought to be able to come up with a distinctive name for each individual compound.

For giving IUPAC name for a compound, the longest hydrocarbon chain is identified. Here there are four carbon atoms in the longest chain. Thus the root name "But" is taken. Now identify the functional group present and their position. In this molecule, a double bond is present at the second position from both ends. Thus it has the name 2-Butene.

Hence, option B is correct.

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