Orthoboric acid contains :

Pyramidal

B O_{3}^{3 -}

units

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.Linear

B O_{3}^{3 -}

units

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T-shaped

B O_{3}^{3 -}

units

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Triangular

B O_{3}^{3 -}

units

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Solution

The correct option is D Triangular $B O_{3}^{3 -}$ units
The simplest borate anion, the orthoborate ion, ${B O_{3}}^{3 -}$ is known. In this it adopts a near trigonal planar structure. It is a structural analogue of the carbonate anion ${C O_{3}}^{2 -}$ , with which it is isoelectronic. Simple bonding theories point to the trigonal planar structure. In terms of valence bond theory the bonds are formed by using $s p^{2}$ hybrid orbitals on boron as shown in figure.

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