Arrange the following compounds of each set in increasing order of Sn1 reactivity
(a) 2-bromo-2 -methyl butane,i-bromopentane, 2-bromopentane
(b) 1- bromo- 2-methyl butane, 2-bromo-2 methyl butane, 2-bromo-3-methylbutane
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Explanation:
The decreasing order of rate of S
N
2 is II>I>IV>III.
The rate is maximum for II as two electron withdrawing groups CN and Br are present.
They decrease the electron density on methylene carbon atom and make it more electrophilic.
The rate is minimum for III as it contains only one electron withdrawing Br atom and is a secondary alkyl halide.
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