First slide

Diborane

Question

Observe the following statements :
1) H₃BO₃ is used as antiseptic
2) In B₂H₆, each boron is sp² hybridized
3) Aqueous solution of borax is alkaline in nature
The correct statements are :

Easy

A

2 and 3
B

1, 2 and 3
C

1 and 3
D

1 and 2

Solution

I) The aqueous solutin of boric acid is used as antiseptic in the name of boric lotion.
→ Boric acid is also used as food preservative.
II) In diborane each boron undergoes sp³hybridisation.
In diborane each B atom undergoes sp³hybridisation, it contains two B-H-B bridges. Each bridge bond is formed by overlapping of one "B"sp³hybrid orbital with one electron, hydrogen s-orbital with one electron and another boron sp³ hybrid orbital without electron. That is the bridge head bond is a electron deficient three centre two electron bond.



II) The aqueous solution of borax is alkaline in nature.Scince in aqueous borax undergoes anionic hydrolysis.
The cation of strong base (Na+) cannot undergo hydrolysis,where as anion of weak acid( B₄O₇^-2) donot undergo hydrolysis.
$N{a_2}{B_4}{O_7}\xrightarrow{{Hydrolysis}}2N{a^ + } + {B_4}O_7^{ - 2}$
${B_4}O_7^{ - 2} + 2{H_2}O\xrightarrow{{Hydrolysis}}{H_2}{B_4}{O_7} + 2O{H^ - }$
2Na⁺ + 2OH¯ $\rightarrow$ 2NaOH

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