Draw the structure of boric acid showing hydrogen bonding. Which species is present in water? What is the hybridizations of boron in this species?
Draw the structure of boric acid showing hydrogen bonding. Which species is present in water? What is the hybridizations of boron in this species?
It has a layer structure in which planar $\mathrm{H}_{3} \mathrm{BO}_{3}$ units are joined by hydrogen bonds forming hexagonal rings. Boric acid is a weak monobasic acid. It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion. In water, boric acid is present in the form of $\left[\mathrm{B}(\mathrm{OH})_{4}\right]^{-}$species. The hybridizations of boron in this species is $s p^{3}$. $\mathrm{B}(\mathrm{OH})_{3}+2 \mathrm{HOH} \rightarrow\left[\mathrm{B}(\mathrm{OH})_{4}\right]^{-}+\mathrm{H}_{3} \mathrm{O}^{+}$
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Match List $I$ with List $II$. Choose the correct answer from the options given below:
List $-I$
List $-II$
$A.$ Melting point $[\mathrm{K}]$
$I.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}$
$B.$ Ionic Radius $\left[\mathrm{M}^{+3} / \mathrm{pm}\right]$
$II.$ $\mathrm{B}>\mathrm{Tl}>\mathrm{Al} \approx \mathrm{Ga}>\mathrm{In}$
$C.$ $\Delta_{\mathrm{i}} \mathrm{H}_1 $ $ [\mathrm{~kJ} \mathrm{~mol}^{-1}]$
$III.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}$
$D.$ Atomic Radius $[pm]$
$IV.$ $\mathrm{B}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}$
Match List $I$ with List $II$. Choose the correct answer from the options given below:
| List $-I$ | List $-II$ |
|
$A.$ Melting point $[\mathrm{K}]$ |
$I.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}$ |
|
$B.$ Ionic Radius $\left[\mathrm{M}^{+3} / \mathrm{pm}\right]$ |
$II.$ $\mathrm{B}>\mathrm{Tl}>\mathrm{Al} \approx \mathrm{Ga}>\mathrm{In}$ |
| $C.$ $\Delta_{\mathrm{i}} \mathrm{H}_1 $ $ [\mathrm{~kJ} \mathrm{~mol}^{-1}]$ | $III.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}$ |
| $D.$ Atomic Radius $[pm]$ | $IV.$ $\mathrm{B}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}$ |
- [JEE MAIN 2024]