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JEE Advanced levelSingle correct optionDifficulty 3 of 3ro054

Two reactions are studied: tert-butyl bromide hydrolysed by SN1 (rate = k[RBr]) and ethyl bromide hydrolysed by SN2 with hydroxide (rate = k[RBr][OH-]). In both, [RBr] is halved and [] is tripled. The factors by which the rate changes for tert-butyl bromide and ethyl bromide are respectively

  1. A1.5 and 0.5
  2. B0.5 and 1.5
  3. C1.5 and 1.5
  4. D0.5 and 3

Answer: B

SN1 rate depends only on [RBr]: factor 0.5. SN2 rate depends on both: 0.5 x 3 = 1.5.
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