JEE Main 201910 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 10 January
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2019 · 10 January · Evening Shift · Chemistry · p Block Elements (Group 13 & 14)

The number of 2 -centre- 2 -electron and 3 -centre- 2 -electron...

The number of

2

-centre-

2

-electron and

3

-centre-

2

-electron bonds in

{B}_{2}{H}_{6}

, respectively, are: The number of 2 -centre- 2 -electron and 3 -centre- 2 -electron bonds in B _ 2 H _ 6 , respectively, are:

Options

A $4$ and $2$
B $2$ and $4$
C $2$ and $2$
D $2$ and $1$

Correct answer

A. $4$ and $2$

Step-by-step solution

${B}_{2}{H}_{6}$ has $2$ bridge bonds \left(3C - 2{e}^{-}\right) $and 4 terminal bonds \left(2C - 2{e}^{-}\right)$ .
The number of 2 -centre- 2 -electron and 3 -centre- 2 -electron bonds in B _ 2 H _ 6 , respectively, are:

Practice p Block Elements (Group 13 & 14) on Quantrex Academy →

More from p Block Elements (Group 13 & 14)

Given below are two statements : Statement I: Aluminium upon reaction with NaOH forms… JEE Main 2026 Consider the following reactions Na_ 2 ~B_ 4 O_ 7 Δ 2 X+ Y CuSO_ 4 + Y Non-Luminous flame… JEE Main 2026 It is noticed that Pb^ 2+ is more stable than Pb^ 4+ but Sn^ 2+ is less stable than Sn^… JEE Main 2026 The correct statements from the following are : A. Ionic radii of trivalent cations of… JEE Main 2026 Given below are two statements : Statement I : Elements ' X ' and ' Y ' are the most and… JEE Main 2026 Consider the following reactions. PbCl_ 2 +K_ 2 CrO_ 4 arrow ~A+2 KCl (Hot solution)… JEE Main 2026 Given below are two statements : Statement I : The number of pairs among [SiO_ 2 , CO_ 2… JEE Main 2026 The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715… JEE Main 2025 Full p Block Elements (Group 13 & 14) list All JEE Main PYQs