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a
NH3 is lewis acid
b
Hybridisation of N changes from sp2 to sp3
c
Hybridisation of B changes from sp2 to sp3
d
Bond angle at N remains 107.28'
answer is C.
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Detailed Solution
.. (3 bond pairs +1 lone pair)'N' is sp3 hybridized, pyramidal, electron rich, Lewis baseBF3 .....3 bond pairs'B' is sp2 hybridized, trigonal planar, electron deficient, Lewis acid(4 bond pairs) (4 bond pairs)Sp3 trahedral sp3 tetrahedralOnly 3 option is correct.Hybridization of 'B' changes from sp2 to sp3