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  4. Among the choices of alkyl bromide, the least reactive bromide in SN2 reaction is

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Q. Among the choices of alkyl bromide, the least reactive bromide in $S_N2$ reaction is

J & K CETJ & K CET 2012Haloalkanes and Haloarenes

Solution:

The reactivity of different alkyl halides towards $S_{N} 2$ reaction decreases in the order:
methyl halides $>1^{\circ}$ halides $>2^{\circ}$ halides $>3^{\circ}$ halides.
Since, $2$-bromo-$2$-methylbutane is a tertiary bromide hence it is least reactive among the given