1)

 In benzene  , the triple bond consists of 


A) one sp-sp sigma bond and two p-p bonds

B) two sp-sp sigma bonds and one p-p pi bond

C) one $sp^{2}-sp^{2}$ sigma bond , one p-p pi bond

D) one $sp^{2}-sp^{2}$ sigma bond, one $sp^{2}-sp^{2}$ pi bond and one pi p-p bond

Answer:

Option D

Explanation:

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In benzene, the triple bond consists of one $sp^{2}-sp^{2}$ σ-sigma bond, one $sp^{2}-sp^{2}$  π-bond and one p-p π-bond