plz help me with Q14-18, explain the reason. thx Which of the following is not a

Question

plz help me with Q14-18, explain the reason. thx

Which of the following is not a nucleophile? H_2O CH_3O NH_3 NH_4 All are nucleophiles. Which is the strongest nucleophile? OH^- CH_3CH_2O^- CH_3CH_2OH H_2O Which is not a polar aprotic solvent? Of the following, which one is the best leaving group? F Cl Br I All of these are equally good LG. Which nucleophilic substitution reaction would be unlikely to occur? HO^- + CH_3CH_2-I Ch_3CH_2 - OH + I^- I^- + CH_3 CH_2-H CH_3CH_2 - I + H^- CH_3S^- + CH_3 - BR CH_3 S - CH_3 + Br^- All of the above would be unlikely to occur. None of the above would be unlikely to occur.

Explanation / Answer

14) nucleophile should have electron density but NH4+   is electrod deficienr

so NH4+ is not a nucleophile

15) option b CH3CH2O- is strong nucleophile as it is highly unstable anion.

16) E have H attached to O aton it can give proton.

so alcohols are ploar protic.

so option is not a polar aprotic solvent

17) I-   is best leaving group.

as it is larger size can stabilize the negetive charge more so it is better leaving group.

18) reaction B is not possible.

I- cannot replace the H-

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