20. Which reaction is faster and why? HO A CH,CH,CHO Gerun A, because F is a bet

Question

20. Which reaction is faster and why? HO A CH,CH,CHO Gerun A, because F is a better leaving group that I b. ) B, because I is a better leaving group that F A, because F stabilizes the reactant better than I d. B, because I stabilizes the reactant better than F e. The reaction rates are equivalent 21. Consider nucleophilic substitution reactions of alkylhalides, where a moderately reactive nucleophil which of the following sets of conditions is the S2 mechanism most likely predominant? primary substrate, acidie-eenditions secondary substrate, aeroemdm otions SN2 , l, Strong nuushs, Nega hvecha econdary substrate, basic conditions e. cannot differentiate 22-The energy of the rate-determining step is the difference between points: Use the reaction profile for questions 22-23 Energy Reaction Coordinate The energy of the rate-determining step is the difference between points: and I 3 and 1 c. 4 and 1 d. 5 and 1 e. 4 and 3 23. Which point(s) represent an intermediate? 2 only b.)3 only c. 4 only d. 2 and 4 e. 2, 3, and 4

Explanation / Answer

solution :-

Q20) the reaction B is faster reaction because the iodine is the good leaving group than the fluorine therefore the reaction involving the iodine is the faster reaction

So the answer is option B

Q21) For the SN2 reaction with the moderate reactivity nucleophile primary alkyl halide is more suitable

So the answer will be option A that is primary alkyl halide and acidic conditions.

Q22)

Diagram is shown for the SN1 reaction therefore in the SN1 reaction the rate determining step is the first step in which the carbocation is formed

So the energy of the rate determining steps is shown by point 2 and 1 so the option A is correct

Q23) Point 3 shows the intermediate

Intermediate is the carbocation which is formed in the sn1 reaction so it is shown with point 3

So the answer is option B

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