19.
What is the shape and hybridisation of transition state in SN² mechanism?
(A) Planar & sp2
(B) Trigonal blpyramidal & SP2
(C) Tetrahedral & SP3
(D) Trigonal bipyramidal & spid
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Answer:
In transition state of SN2 mechanism, the carbon atom is sp2 hybridised due to its planar structure. At this point, carbon almost acquires 'pentavalency' with three full bonds and two 'partial' bonds, and a planar complex is formed, which is sp2 hybridised
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In that case, the transition state is Sp2 hybridized. This is because the transition state only has 3 areas of electron density. The bond that is partially forming (Carbon to nucleophile) and the bond that is partially breaking (Carbon to leaving group) are not factored into the hybridization
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