Arrange `C-C,C=C` and `C-=C` in order of
(i) Decreasing bond energey
(ii) Decreasing bond lengths
(b) The `As-CI` bond distance in `As CI_(3)` is `2.20 A` Estimate the single- bond covalent radius of As .

Explanation

`C-= CgtC =Cgt C-C`
(ii) `C - C gtC implies C -=C`
(b) Internuclear distance -radius of chlorine atom = radius of As - atom
`:. (2.20 - 0.99) = 1.21 Å` .