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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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