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Which of the following reactions does not involve change in hybridisation ?

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Hydrogenation of ethene

Protonation at oxygen of CH₂O

Dissociation of C - Cl bond of CH₃Cl

Hydride ion addition at carbon of CH₂O

answer is A.

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Detailed Solution

Protonation means addition of proton [H⁺].

In above case Sp² hybridisaed carbon changes to Sp³ hybridised carbon.

hybridisation changes from Sp³ to Sp².

hybridisation changes from Sp² to Sp³ during protonation no change in hybridisation of carbon atom.

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