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CBSE Class 12 Chemistry 2015 Solved Paper

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Question : 5 of 26
Marks: +1, -0
Which would undergo SN2\mathrm{S_N2} reaction faster in the following pair and why?
CH3−CH2−Br2\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Br}_2 and CH3−CCH3CH3−CH3\mathrm{CH}_3-\overset{\mathrm{CH}_3}{\underset{\mathrm{CH}_3}{\mathrm{C}}}-\mathrm{CH}_3
Solution:  
CH3−CH2−Br\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{Br}
Because it is a primary halide (1∘)(1^{\circ}) halide
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