CET Karnataka Medical CET - Karnataka Medical Solved Paper-2012

  • question_answer
    Which of the following is not true for \[{{S}_{N}}1\] reaction?

    A)  Favoured by polar solvents

    B)  \[{{3}^{o}}\]-alkyl halides generally react through \[{{S}_{N}}1\] reaction.

    C)  The rate of the reaction does not depend upo the molar concentration of the nucleophile.

    D)  \[{{1}^{o}}\]-alkyl halides generally react through \[{{S}_{N}}1\]reaction.       

    Correct Answer: D

    Solution :

    : \[{{S}_{N}}1\] reaction is favoured by bulky groups on the carbon atom attached to halogens; i.e., the order of reactivity is \[\underset{Tertiary}{\mathop{{{R}_{3}}C-X}}\,>\underset{Secondary}{\mathop{{{R}_{2}}CH-X}}\,>\underset{\text{Primary}}{\mathop{RC{{H}_{2}}-X}}\,>\underset{Methyl}{\mathop{C{{H}_{3}}-X}}\,\]                                     


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