Chemistry - Hydrocarbon Question with Solution | TestHub

Note: In the given reaction a molecule of $\mathrm{HCl}$ is lost and $\mathrm{C}=\mathrm{C}$ double bond is formed. Thus it is dehydrohalogenation reaction. Nitro group is electron withdrawing group. Hence increases the acidity of $\mathrm{H}$ atom (attached to $\mathrm{C}$ atom bearing nitro group) which is removed easily. Further the newly formed double bond is in conjugation with nitro group.