Chemistry - GOC Question with Solution | TestHub

No resonance and less no. of $\alpha \mathrm{H}\therefore \mathrm{HOH}$ is maximum due to most unstable alkene.

⇒ More no. of aH 2 resonance $\therefore$ HOH less order ( $\mathrm{C}<\mathrm{D}<\mathrm{B}<\mathrm{A}$ ) $(7\alpha \mathrm{H})$