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JEE Main 202628 JanuaryMorning Shift
Exam
JEE Main
Year
2026
Date
28 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Main 2026 · 28 January · Morning Shift · Chemistry · Chemical Bonding and Molecular Structure

Given below are two statements: Statement I : The number of species...

Given below are two statements:
Statement I: The number of species among BF4−,SiF4,XeF4\mathrm{BF}_{4}{ }^{-}, \mathrm{SiF}_{4}, \mathrm{XeF}_{4} and SF4\mathrm{SF}_{4}, that have unequal E−F\mathrm{E}-\mathrm{F} bond lengths is two. Here, E is the central atom.
Statement II: Among O2−,O22−,F2\mathrm{O}_{2}^{-}, \mathrm{O}_{2}{ }^{2-}, \mathrm{F}_{2} and O2+,O2−\mathrm{O}_{2}{ }^{+}, \mathrm{O}_{2}^{-}has the highest bond order.
In the light of the above statements, choose the correct answer from the options given below

Options

  1. ABoth Statement I and Statement II are false
  2. BStatement I is true but Statement II is false
  3. CStatement I is false but Statement II is true
  4. DBoth Statement I and Statement II are true

Correct answer

A. Both Statement I and Statement II are false

Step-by-step solution

Statement I: Let's analyze the geometry of the given species.
BF4−BF_4^-: sp3sp^3 hybridization, tetrahedral geometry. All B-F bond lengths are equal.
SiF4SiF_4: sp3sp^3 hybridization, tetrahedral geometry. All Si-F bond lengths are equal.
XeF4XeF_4: sp3d2sp^3d^2 hybridization, square planar geometry. All Xe-F bond lengths are equal.
SF4SF_4: sp3dsp^3d hybridization, see-saw geometry. It has axial and equatorial bonds. Axial bonds are longer than equatorial bonds due to greater repulsion. Thus, only SF4SF_4 has unequal bond lengths. The number of species is one, not two. Statement I is false.
Statement II: Bond order calculation using Molecular Orbital Theory:
Total electrons in O2−O_2^- = 17, Bond Order = 1.5
Total electrons in O22−O_2^{2-} = 18, Bond Order = 1.0
Total electrons in F2F_2 = 18, Bond Order = 1.0
Total electrons in O2+O_2^+ = 15, Bond Order = 2.5
Among these, O2+O_2^+ has the highest bond order (2.5), not O2−O_2^-. Statement II is false.
Both Statement I and Statement II are false.
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