Rank the following in order of decreasing leaving group ability, putting the bes

Question

Rank the following in order of decreasing leaving group ability, putting the best first.

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24. Rank the following in order of decreasing leaving group ability, putting the best first. Br H2O I>II II DO II III I IV II I IV 25. Which of the following solvents is not a polar protic solvent? CH3OH CH3CN CH3COOH H2O A) I B) II C) III D) IV 26. For the following reaction, use the identity of the alkyl halide and nucleophile to determine which substitution mechanism occurs. Then determine which solvent affords the faster reaction. H20 Bre HO DMF A) SN1, H20 B) SNl, DMF C) SN2, H20 DO SN2, DMF

Explanation / Answer

24) option B is correct

Explanation: weak bases have good leaving ability. iodide ion is a weak base and good leaving group.

25) option B is correct

Explanation: A solvent having a free hydrogen then it is called polar protic solvent. CH3CN does not have a free hydrogen so it is not polar protic solvent.

26) option D is correct

Explanation: reaction of simple alkyl halide or primary alkyl halide with a strong base like, OH- produces alcohol as product. This reaction is called SN2 mechanism and SN2 mechanism is favourable in aprotic solvent. DMF is aprotic solvent.

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