Assertion : `B(OH)_3` is acidic while `In(OH)_3` is basic. Reason : `B(OH)_3` has highly H-bonded network structure.
A
If both (A) and (R) are correct and (R) is the correct explanation of (A).
B
If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C
If( A) is correct, but (R) is incorrect.
D
If both (A) and (R) are incorrect.
Text Solution
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The correct Answer is:
C
Due to small size and high ionisation enthalpy, B in `B(OH)_3` accepts `OH^(ѳ)` ion from `H_2O` and thus acts as a Lewis acid. However, due to large size and low ionisation enthalpy of In, the In -OH bond readily breaks and releases `OH^(ѳ)` ion, thus In `(OH)_3` acts as a base.
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