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Question

Choose the member of the given pair that will react faster by SN1 mechanism.
2-bromo-2-methylbutane or 2-bromo-3-methyl butane:

A
2-bromo-2-methylbutane > 2-bromo-3-methyl butane
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B
2-bromo-2-methylbutane < 2-bromo-3-methyl butane
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C
2-bromo-2-methylbutane = 2-bromo-3-methyl butane
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D
None of these
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Solution

The correct option is A 2-bromo-2-methylbutane > 2-bromo-3-methyl butane
2bromo−2methylbutane will react faster by SN1 mechanism than 2−bromo−3−methylbutane.

2−bromo−2−methylbutane is tertiary alkyl halide and forms tertiary carbocation.2-bromo_3-methylbutane is secondary alkyl halide and forms secondary carbocation.

Tertiary carbocation is more stable and more easily formed than secondary carbocation.

453321_141355_ans_97dcd446da1346b5853c703c8d7b39ad.png

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