Correct orders for nucleophilicity is / are :

Engineering

Chemistry

Electrophile and Nucleophile

Question

$I^{⊝} in H_{2} O < I^{⊝} in DMSO$

$\overset{⊝}{C} N in H_{2} O > \overset{⊝}{C} N in DMSO$

$\overset{⊝}{S} H in DMSO < \overset{⊝}{S} H in MeOH$

$\overset{⊝}{O} H in EtOH < \overset{⊝}{O} H in 18 - Crown - 6$

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Polar protic solvents decrease the nucleophilicity as they solvate anion.