According to the valence bond theory the triple bond in ethyne consists of

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09-05-2018
Chemistry

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According to the valence bond theory the triple bond in ethyne consists of

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transitionstate transitionstate · Answer 1 · 2018-05-22T19:04:55+02:00

Answer:
According to the valence bond theory the triple bond in ethyne consists of one sigma bond and two pi bonds.

Explanation:
Atomic number of carbon is 6. The ground state electronic configuration of carbon is as follow,

1s², 2s², 2p²

And the excited state electronic configuration of carbon is as follow,

1s², 2s¹, 2px¹, 2py¹, 2pz¹

In ethyne the 2s¹ orbital and 2px¹ orbitals having unpaired electrons form sigma bonds by head to head overlapping with orbitals of hydrogen atom and carbon atom. The remaining 2py¹ and 2pz¹ orbitals of both carbons overlap perpendicular to the existing sigma bond resulting in the formation of two pi bonds.