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# What is the hybridisation of carbon atoms in $C-C$ single bond of $HC \equiv C-CH=CH_2$?

$\begin{array}{1 1}(A)\;sp^3-sp^3&(B)\;sp^2-sp^3\\(C)\;sp-sp^2&(D)\;sp^3-sp\end{array}$

$sp-sp^2$
Hence (C) is the correct answer.