Select the reagent that will yield the greater amount of substitution on reaction with CH3−CH2−Br :
A
CH3CH2OK in dimethyl sulfoxide (DMSO)
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B
(CH3)3COK in dimethyl sulfoxide (DMSO)
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C
Both (a) and (b) will give comparable amounts of substitution
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D
Neither (a) nor (b) will give any amount of substitution
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Solution
The correct option is BCH3CH2OK in dimethyl sulfoxide (DMSO) 1o alkyl halide is more reaction for SN2 displacement.Also the bulky base elimination reaction.So,CH3CH2−OK in DMSO solvent will generally give the substitution product.