Question

Which of the following names of a compound is not correct according to the IUPAC?

Options

• 2-Ethyl-3-methylbutane

• 3,3-Dimethylpentane

• 3-Methyl-but-3-ene

• Both 2-Ethyl-3-methylbutane and 3-Methyl-but-3-ene

Answer 1

Both 2-Ethyl-3-methylbutane and 3-Methyl-but-3-ene

Explanation:

2-Ethyl-3-methylbutane does not use the longest carbon chain, while 3-Methyl-but-3-ene gives the double bond a higher number. Hence, both names are incorrect according to IUPAC rules.