Which of the following organic compounds has same hybridisation as its combustion $$\left( {C{O_2}} \right)$$  product?

Solution :
Hybridisation of carbon $$ = s{p^{3 - {\text{number}}\,{\text{of}}\,\pi - bonds}}$$
In $$C{O_2},(\,O\mathop = \limits_{1\pi } C\mathop = \limits_{1\pi } O\,)$$    hybridisation of carbon $$ = s{p^{3 - 2}} = sp$$
In ethyne or acetylene, $${C_2}{H_2},(\,H - C\mathop \equiv \limits^{2\pi } C - H\,\,)$$      hybridisation of carbon $$ = s{p^{3 - 2}} = sp$$