Question

Assertion :Statement-I : boiling point of alkyl halide increases with increase in molecular weight.
Because Reason: Statement-II : boiling point of alkyl halides are in the order $RI>RBr>RCl>RF$.

• A. (A)Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
• B. (B)Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.
• C. (C)Statement-I is true, Statement-II is false.
• D. (D)Statement-I is false, Statement-II is true.

Answer 1

The correct option is B (B)Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.

The boiling point of alkyl halide increases with increase in the molecular weight because,the surface area and the magnitude of the vander waals forces increases.The decreasing order of the boiling points of alkyl hlides is $RI>RBr>RCl>RF$. As the size of the halogen increases, the magnitude of vander waals forces increases and the boiling point increases. Thus, both the statements are true but the statement II is not correct explaination of statement I.