(C) The structure of ethyne is $H-C \equiv C-H$. In a triple bond,there is one strong sigma $(\sigma)$ bond formed by the head-on overlap of orbitals

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(C) The structure of ethyne is $H-C \equiv C-H$. In a triple bond,there is one strong sigma $(\sigma)$ bond formed by the head-on overlap of orbitals and two weak pi $(\pi)$ bonds formed by the lateral overlap of $p$-orbitals. Therefore,a triple bond consists of one sigma bond and two pi bonds.