Haloalkanes and Haloarenes

Haloalkanes and Haloarenes

Question

Following compounds are given to you :
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
(i) Write the compound which is most reactive towards SN2 reaction.
(ii) Write the compound which is optically active.
(iii) Write the compound which is most reactive towards b-elimination reaction.

Answer

(i) 1-bromopropane. Primary alkyl halides are most reactive for SN2.
(ii) 2-bromopentane: It has a unsymmetrical carbon atom. C2 is attached to 4 different groups i.e. methyl, propyl a dihydrogen atom.
(iii) 2-bromo-2-methyl butane: Tertiary alkyl halide is most reactive for elimination.

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