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The hybridisation of each carbon in ethyne (C₂H₂) is:

Asp²
Bdsp²
Csp
Dsp³
Answer & Solution
Correct answer: C. sp
In HC≡CH, each carbon is **sp**-hybridised: two sp hybrids (one for C–C σ, one for C–H σ) plus two unhybridised p orbitals that side-overlap to give two π bonds.
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