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Which of the following molecules represents the order of hybridisation $sp^2$, $sp^2$, sp, sp from left to right atoms?
Explanation
Double-bonded carbons are $sp^2$ and triple-bonded carbons are sp.
Detailed Solution
$\overset{sp^2}{C}H_2=\overset{sp^2}{C}H-\overset{sp}{C}\equiv\overset{sp}{C}H$
Number of orbitals required in hybridisation = number of $\sigma$-bonds around each carbon atom.