P-Block Elements Ques 521
Question: Which of the following statements are correct?
(i) Aluminium forms $ {{[AlF_6]}^{3-}} $ ion while boron forms only $ {{[BF_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.
Options:
A) (i) (ii) (iii)
B) (i) (iii)
C) (i) (ii)
D) (ii) (iii)
Show Answer
Answer:
Correct Answer: C
Solution:
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.
