For questions 4 and 5, more than one letter may apply: The concentration of which reagent...

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For questions 4 and 5, more than one letter may apply: The concentration of which reagent should be increased to accelerate t

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Answer 1

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Answer 4. A

explanation: Here , the substrate is tert-butyl bromide, and the nucleophile is CH3CH2O(-) , It is SN1 reaction. In which bromide ion first dissociates and formation of tert butyl cation takes place , later, Nucleophile,will attack at carbocation to give the desired product.

Therefore, we are aware that, in SN1 , the rate of reaction only depends on the concentration of Substrate not on the reagents ,thus substrate is A, and by increasing the concentration of A ,the rate can be accelerated.

Answer 5. A,B both.

explanation: it is typical SN2 Reaction, in which I- attack at the back side of Substrate, and Br- leaves simaltaneously.and so, the rate depends on concentration of both substrate and reagents , A,B ,thus by increasing the concentration of A and B , rate of reaction can be accelerated.

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