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a
AlF3>MgO>MgF2 : Lattice energy
b
Li>Na>Al>Mg : Electron affinity
c
SF6>PF5>SiF4 : Lewis acidic character
d
SiCl4>SiBr4>SiI4 : Decreasing order of electronegativity of Si
answer is C.
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Detailed Solution
Correct order of Lewis acidic character : PF5 > SiF4 > SF6. Although, S has vaccant 3d-orbitals but it cannot accept co-ordinate bond from Lewis base due to steric crowding factor as S-atom is already bonded to six F-atoms.