Chemistry - Hydrocarbon Question with Solution | TestHub

$\underset{\text{ acetylene }}{\mathrm{HC}\equiv \mathrm{CH}}+\underset{\text{ formaldehyde }}{\mathrm{HCHO}}\stackrel{\text{ High pressure }}{⟶}\mathrm{HC}\equiv \mathrm{C}-{\mathrm{CH}}_2\mathrm{OH}$ $\mathrm{HC}\equiv \mathrm{C}-{\mathrm{CH}}_2\mathrm{OH}+\mathrm{H}-\stackrel{\genfrac{}{}{0ex}{}{\mathrm{H}}{|}}{\mathrm{C}}=\mathrm{O}⟶\underset{\text{ But-2-yn, }4\text{ diol }}{{\mathrm{HOCH}}_2\equiv {\mathrm{CCH}}_2\mathrm{OH}}$ Therefore, acetylene with formaldehyde under high pressure forms by butyndiol.