• # question_answer Number of unhybridised orbitals in vinyl acetylene are [RPMT 1999] A) 2 B) 3 C) 4 D) 6

Vinyl acetylene there are 6 unhybridised orbitals. $\underset{\text{(no}\text{. of unhybridised orbitals)}}{\mathop{\underset{\underset{1}{\mathop{\text{s}{{\text{p}}^{2}}}}\,}{\mathop{C{{H}_{2}}}}\,=\underset{\underset{1}{\mathop{\text{s}{{\text{p}}^{2}}}}\,}{\mathop{CH}}\,-\underset{\underset{\text{2}}{\mathop{\text{sp}}}\,}{\mathop{C}}\,\equiv \underset{\underset{\text{2}}{\mathop{\text{sp}}}\,}{\mathop{CH}}\,}}\,$