Identify the correct statement for ${B}_{2}{H}_{6}$ from those given below. (A) In ${B}_{2}{H}_{6}$, all $B-H$ bonds are equivalent. (B) In ${B}_{2}{H}_{6}$, there are four $3$-centre- $2$-electron bonds. (C) ${B}_{2}{H}_{6}$ is a Lewis acid. (D) ${B}_{2}{H}_{6}$ can be synthesized from both ${\mathrm{BF}}_{3}$ and ${\mathrm{NaBH}}_{4}$. (E) ${B}_{2}{H}_{6}$ is a planar molecule. Choose the most appropriate answer from the options given below :

JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

Identify the correct statement for ${B}_{2}{H}_{6}$ from those given below.

(A) In ${B}_{2}{H}_{6}$ , all $B-H$ bonds are equivalent.

(B) In ${B}_{2}{H}_{6}$ , there are four $3$ -centre- $2$ -electron bonds.

(D) ${B}_{2}{H}_{6}$ can be synthesized from both ${\mathrm{BF}}_{3}$ and ${\mathrm{NaBH}}_{4}$ .

(E) ${B}_{2}{H}_{6}$ is a planar molecule.

Choose the most appropriate answer from the options given below :

Official previous-year question

Held on 24 Jun 2022 · Verified 6 Jul 2026.

Options

A
$(A)$ and $(E)$ only
B
$(B),(C)$ and $(E)$ only
C
$(C)$ and $(D)$ only
D
$(C)$ and $(E)$ only

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Solution

JEE Main 2022 Chemistry, p Block Elements (Group 13 and 14) — solution figure

${B}_{2}{H}_{6}$ have $\mathrm{four}2c-2e$ bonds and $\mathrm{two}3c-2e$ bonds. Bridging bonds have larger bond length than terminal bonds. Angle between terminal bonds is more than angle between bridging bonds if all $4$ terminal bonds are in one plane then bridging bonds are in perpendicular plane.

$3{\mathrm{NaBH}}_{4}+4{\mathrm{BF}}_{3}\underset{450K}{\overset{\mathrm{ether}}{\longrightarrow }}3{\mathrm{NaBF}}_{4}+2{B}_{2}{H}_{6}$

Therefore we can say that only statement (C) and (D) are correct.

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Solution

JEE Main 2022 Chemistry, p Block Elements (Group 13 and 14) — solution figure

$3{\mathrm{NaBH}}_{4}+4{\mathrm{BF}}_{3}\underset{450K}{\overset{\mathrm{ether}}{\longrightarrow }}3{\mathrm{NaBF}}_{4}+2{B}_{2}{H}_{6}$

Therefore we can say that only statement (C) and (D) are correct.

JEE Main 2022 — Chemistry Inorganic Chemistry

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