| (i) Aluminium forms \[{{[Al{{F}_{6}}]}^{3-}}\] ion while boron forms only \[{{[B{{F}_{4}}]}^{-}}\] ion due to presence of d-orbitals in aluminium. |
| (ii) The first member of a group differs from the heavier members in its ability to form \[p\pi -p\pi \] multiple bonds to itself and to other second row elements. While heavier member forms \[d\pi -p\pi \] bonds. |
| (iii) d-orbitals contribute more to the overall stability of molecules than \[p\pi -p\pi \] bonding of second row elements. |
A) (i) (ii) (iii)
B) (i) (iii)
C) (i) (ii)
D) (ii) (iii)
Correct Answer: C
Solution :
[c] d-orbitals are of higher energy than the p -orbitals, they contribute less to the overall stability of molecules than \[p\pi -p\pi \] bonding of the second row elements.
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