AIIMS AIIMS Solved Paper-2005

  • question_answer

    Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as

    Assertion: Rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water. Reason: Hydrolysis of methyl chloride follows second order kinetics.

    A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

    B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

    C) If Assertion is true but Reason is false.

    D) If both Assertion and Reason are false.

    Correct Answer: A

    Solution :

    Primary alkyl halide (Here \[C{{H}_{3}}Cl\]) undergo \[{{S}_{N}}2\]mechanism and not \[{{S}_{N}}1\] mechanism. Hence, hydrolysis of S \[C{{H}_{3}}Cl\] is favoured by non polar medium or polar non-protic solvent (in which proton is not generated) like DMF whereas \[{{S}_{N}}1\] mechanism are favoured by polar solvents like water.


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