Question

Why is boiling point of ethyl bromide higher that that of ethyl chloride ?

Answer 1

The boiling point of ethyl bromide is higher than that of ethyl chloride because

1) When an atom size increases Vanderwall force increases which tights the bonds so from that bromide and chloride both attach to ethyl but bromide has a large size so Vanderwall forces increases and tights the bond which does not easily break compare to ethyl bromine

2) The boiling point is directly proportional to polarity as bromine is more electronegative than chlorine, so bromine increases polarity more and the polarity increases means ionic character developed which are not easily broken.

Now for two reasons we can say that ethyl bromide has more.boiling point.than ethyl chloride.