Question

For a given alkyl group, the boiling point is in the order:

• A. $RI<RBr<RCl$
• B. $RI<RCl<RBr$
• C. $RBr<RI<RCl$
• D. $RCl<RBr<RI$

Answer 1

The correct option is D $RCl<RBr<RI$

The boiling points of alkyl halides decreases in the order $RI>RBr>RCl>RF.$

This is because as the size of halogen increases, the magnitude of van der Waals forces increases, and hence the boiling point increases.

Option D is correct.