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Question

Which of the following Lewis acid – base interactions are associated with the further involvement of d-orbitals?

i) SbF5+HFH+[SbF6]
ii) NH3+BF3H3NBF3
iii) AlCl3+ClAlCl4
iv) SF4+F[SF5]

A
(i) and (ii)
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B
(i) and (iv)
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C
(ii) and(iii)
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D
(i) and (iii)
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Solution

The correct option is B (i) and (iv)
Both SbF5 and SF4 have all the p orbitals ocuppied. Hence they involve vacant d-orbitals to form [SbF6] and
[SF5].

H3NBF3 here,the lone pair of N is donated to vacant p orbital of B

AlCl4 here, the lone pair of Cl is donated to vacant p orbital of Al
Hence (i) and (iv) are correct

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