PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Arrange the compounds in order of reactivity towards SN2 displacement: 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane - PUC Karnataka Science Class 12 - Chemistry

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Question

Arrange the compounds of each set in order of reactivity towards SN2 displacement:

2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

Solution

An SN2 reaction involves the approaching of the nucleophile to the carbon atom to which the leaving group is attached. When the nucleophile is sterically hindered, then the reactivity towards SN2 displacement decreases. Due to the presence of substituents, hindrance to the approaching nucleophile increases in the following order.

1-Bromopentane < 2-bromopentane < 2-Bromo-2-methylbutane

Hence, the increasing order of reactivity towards SN2 displacement is:

2-Bromo-2-methylbutane < 2-Bromopentane < 1-Bromopentane

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 10: Haloalkanes and Haloarenes
Q: 16.1 | Page no. 311
Solution Arrange the compounds in order of reactivity towards SN2 displacement: 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane Concept: Chemical Reactions of Haloalkanes and Haloarenes - Reactions of Haloalkanes - Nucleophilic Substitution Reactions.
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