question_answer

During polymerization of acetylene to benzene, the state of hybridisation of carbon changes from

A)  \[s{{p}^{2}}\]to \[sp\]  

B)         \[s{{p}^{3}}\]to \[sp\]  

C)         \[sp\]to \[s{{p}^{3}}\]  

D)         \[sp\]to \[s{{p}^{2}}\]

Correct Answer: D

Solution :

\[\underset{\text{acetylene}}{\mathop{\underset{sp}{\mathop{3CH}}\,\equiv \underset{sp}{\mathop{CH}}\,}}\,\overset{\text{Red}\,\text{hot}}{\mathop{\xrightarrow[high\,T,p]{Cu\,tube}}}\,\]