Chemistry - Halogen Derivative Question with Solution | TestHub

Scheme 1 and 2 describe the conversion of $\mathbf{P}$ to $\mathbf{Q}$ and $\mathbf{R}$ to $\mathbf{S}$, respectively. Scheme 3 describes the synthesis of $\mathbf{T}$ from $\mathbf{Q}$ and $\mathbf{S}$. The total number of ${\mathrm{sp}}^2$ hybridised atoms in T is: