Select the species which is best described to the right
(a) `CI_(2),Br_(2),I_(2)` (has the lowest boiing point)
(b) `CI,Ar,K` (has the smallest `IE`)
(c ) `CH_(4), NH_(3),HF` (has the highest boiling point)
(d) `CO_(2),NH_(3),CO` (has zero dipole moment)
(e) `HOI,HOBr,HOCI` (is the weakest acid) .

Explanation

`CI_(2)` has the fewest electrons, therefore least van der Waals forces
(b) `K` is metal, thus smallest `IE`
( c) `HF` has H-bonding the largest intermolecular force
(d) `CO_(2)` polar but `CO_(2)` is linear, and the bond moments cancel
(e) In `HOI,I` is least `EN` it pulls electrons least leaving a greater fraction of the `O` electrons to bond with the `H` atom .