Q. 865.0( 1 Vote )

Note : In the fol A. Assertion and reason both are correct and reason is correct explanation of assertion.

B. Assertion and reason both are wrong statements.

C. Assertion is correct but reason is wrong statement.

D. Assertion is wrong but reason is correct statement.

E. Assertion and reason both are correct statements but reason is not correct explanation of assertion.

Assertion : The boiling points of alkyl halides decrease in the order :

RI > RBr > RCl > RF

Reason : The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

Answer :

The boiling points of the alkyl halides decrease in the given order because of the size of the halogen atom. Iodide having the highest atomic number, has more electrons, which means increase in Van Der Waals forces and the higher boiling point.

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