Boric acid is an acid because its molecule

Options

A. contains replaceable `H^(+)` ion
B. gives up a proton
C. accepts `OH^(-)` from water releasing proton
D. combines with proton from water molecule

Answer

C

Explanation

Lewis acids are substances whose octet is incomplete and accepts electrons. Boric acid is a monobasic weak acid. It does not liberate `H^(+)` ion but accepts electrons from `OH^(-)` ion i.e., behaves as Lewis acid
`H_(3)BO_(3)+H_(2)OrarrB(OH)_(4)^(-)+H^(+)`
or, `B(OH)_(3)+2H_(2)Orarr[B(OH)_(4)]^(-)+H_(3)O^(+)`
The structure of `H_(3)BO_(3)` is as shown below, where the octet of boron in `H_(3)BO_(3)` is incomplete.
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