Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	The boiling points of alkyl halides decrease in the order RI> RBr > RCl > RF
Reason (R):	The boiling points of alkyl chlorides, bromides, and iodides are considerably higher than those of the hydrocarbons of comparable molecular mass.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Hydrocarbon has weak Vanderwall forces, and haloalkane has dipole-dipole interaction

For the same hydrocarbon part, the boiling point depends upon the atomic mass of the halogen atom, the higher the mass of the halogen atom, the higher will be the boiling point.

In hydrocarbon, weak Vanderwall forces are present as an intermolecular force but in alkyl chloride dipole-dipole interaction takes place. The dipole-dipole interaction is stronger than Vanderwall forces. Thus, The boiling points of alkyl halide are considerably higher than that of the hydrocarbon of comparable molecular mass.

Hence, both assertion and reason are true and the reason is not the correct explanation of assertion.

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