Q.
Predict the order of base strength of anions from the reactions given below.
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a
OH- < HC ≡ C- < NH2-
b
HC≡C- < OH- < NH2-
c
OH- < NH2- < HC ≡C-
d
NH2- < OH-< HC ≡C-
answer is A.
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Detailed Solution
A stronger acid replaces a weaker acid from its salt. Hence, HC ≡CH > NH3 (acidic strength) and H2O > HC ≡CH.∴ H2O > HC ≡ CH > NH3 (acidic strength order)Hence, for conjugate bases : OH- < HC≡C- < NH2- (basic strength order)
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