Question

2. The first member of p-block differs from the remaining members of their corresponding group in two
major respects. First is the size and all other properties which depend on size. Thus, the lightest
p-block elements show the same kind of differences as the lightest s-block elements, lithium and
beryllium. The second important difference, which applies only to the p-block elements, arises from
the effect of d orbitals in the valence shell of heavier elements (starting from the third period onwards)
and their lack in second period elements.
i. Which is the correct order of decreasing acidity of Lewis acids?
(a) BBr3 > BC1; > BF:
(b) BFı > BCI, > BBr
(c) BC1: > BF: > BBri
(d) BBrı > BF, > BCI,​

Answer 1

Explanation:

First member of each group of p block elements differ from its exceeding members of their respective group. The 2 main reason for the differences are : 1) Size and other properties which depends upon size. 2) Absence of d orbital in their valence shell.