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Q.

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

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a

Protonation at oxygen of CH2O

b

Hydride ion addition at carbon of CH2O

c

Dissociation of C - Cl bond of CH3Cl

d

Hydrogenation of ethene

answer is A.

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Detailed Solution

(1) Protonation means addition of proton [H+].(2) In above case Sp2 hybridisaed carbon changes to Sp3 hybridised carbon.(3)             Hybridisation changes from Sp3 to sp2.(4)         Hybridisation changes from Sp2 to Sp3.During protonatin no change in hybridisation of carbon atom is observed.
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Which of the following reactions does not involve change in hybridisation ?