Question

Which one of the following is not correct order of boiling points of the alkyl/aryl halides?

• A. $CHC{l}_3>C{H}_{2}C{l}_2$
• B. $C{H}_3(C{H}_2{)}_{3}Cl>C{H}_3(C{H}_2{)}_{2}Cl$
• C. $(C{H}_3{)}_{3}CCl>(C{H}_3{)}_{2}CHC{H}_{2}Cl$
• D. $C{H}_3(C{H}_2{)}_{3}Cl>C{H}_{3}C{H}_{2}CHClC{H}_3$

Answer 1

The correct option is C $(C{H}_3{)}_{3}CCl>(C{H}_3{)}_{2}CHC{H}_{2}Cl$

For the alkyl/aryl group, the boiling points of alkyl halides decrease in order $RI>RBr>RCl>RF$. This is because with the increase in size and mass of halogen atom, the magnitude increases. So the boiling points of chlorides, bromides and iodides are higher than the hydrocarbons of molecular mass. So option C is not the correct order of boiling point.