Chemistry - Nomenclature Question with Solution | TestHub

Longest chain containing the $\mathrm{C}=\mathrm{C}$ has 7 carbons; numbering from the end nearer the $\mathrm{C}=\mathrm{C}$ gives ${\mathrm{C}}_2={\mathrm{C}}_3$, ethyl on ${\mathrm{C}}_3$ and methyl on ${\mathrm{C}}_6$. Alphabetical order: ethyl before methyl. The other options use wrong numbering, the wrong alphabetical order or the wrong parent chain.