$\begin{array}{l}{\mathrm{C}}_2{\mathrm{H}}_2\underset{\mathrm{Tube}}{\overset{\mathrm{red}\mathrm{hot}\mathrm{Cu}}{\to }}\text{'}\mathrm{X}\text{'}\\ \text{'}\mathrm{X}\text{'}+\mathrm{Acetyl}\mathrm{chloride}\underset{\mathrm{acid}}{\overset{\mathrm{lewis}}{\to }}\text{'}\mathrm{A}\text{'}\end{array}$

Total total number of carbon with   $s{p}^2$ Hybridization in the compound ‘A’ is :