Question

The amide ion NH2- is a base which can only be used in which one of the solvents shown below: A) Ch3OH B) CH3CH2OH C) H2O D) D2O E) Liquid NH3

Answer 1

answer : E ) NH3

explanation:

here we know that NH2- is strong base . if we want to use solvent for this nucleophile we should select which is having same ion compound. here NH3 is base and it is having NH2- also . so it is better solvent .

if we use any other mentioned above. those can act as acids and NH2- base. so NH2- nature will lost by acid base reaction .

CH3OH + NH2- ------------> CH3O- + NH3

CH3CH2OH + NH2- ------------> CH3CH2O- + NH3

H2O + NH2- -------------------> NH3 + OH-

D2O + NH2- ------------------> NH2D + OD-

another example :

for CH3CH2O - the solvent we need to use CH3CH2OH