Core Syllabus Module

Chemical Bonding and Molecular Structure

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Chapter Elite-20 Challenge Zone

Target Advanced

JEE Advanced 2023

LEVELJEE Advanced

Among $[I_{3}]^{+}$ , $[SiO_{4}]^{4 -}$ , $SO_{2} Cl_{2}$ , $XeF_{2}$ , $SF_{4}$ , $ClF_{3}$ , $Ni(CO)_{4}$ , $XeO_{2} F_{2}$ , $[PtCl_{4}]^{2 -}$ , $XeF_{4}$ , and $SOCl_{2}$ , the total number of species having $s p^{3}$ hybridised central atom is ______.

JEE Main 2015

LEVELJEE Advanced

Among the triatomic molecules / ions, $BeCl_{2}$ , $N_{3}^{-}$ , $N_{2} O$ , $NO_{2}^{+}$ , $O_{3}$ , $SCl_{2}$ , $ICl_{2}^{-}$ , $I_{3}^{-}$ and $XeF_{2}$ the total number of linear molecules(s) / ion(s) where the hybridization of the central atoms does not have contribution from the d-orbital(s) is : (Atomic number : S = 16, Cl = 17, I = 53 and Xe = 54)

JEE Advanced 2022

LEVELJEE Advanced

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_{z}$ orbitals is(are)

* Multiple Correct Options

(A)

σ

orbital has a total of two nodal planes.

(B)

σ^{*}

orbital has one node in the

x z

-plane containing the molecular axis.

(C)

π

orbital has one node in the plane which is perpendicular to the molecular axis and goes through the center of the molecule.

(D)

π^{*}

orbital has one node in the

x y

-plane containing the molecular axis.

JEE Advanced 2026

LEVELJEE Advanced

Consider the following species : $SOCl_{2}$ , $XeOF_{4}$ , $ClF_{3}$ , $ClF_{5}$ , $XeF_{5}^{+}$ , $SO_{3}^{2 -}$ , $XeF_{3}^{+}$ , $SF_{4}$ List-I contains different molecular shapes and List-II contains total number of species with the same molecular shapes from the given species. Match each entry in List-I with the appropriate entry in List-II.

List-I

List-II

The correct order of ONO bond angle in the given species is :

(A)

NO_{2}^{+} < NO_{2} < NO_{3}^{-} < NO_{2}^{-}

(B)

NO_{2}^{-} < NO_{3}^{-} < NO_{2} < NO_{2}^{+}

(C)

NO_{3}^{-} < NO_{2}^{-} < NO_{2} < NO_{2}^{+}

(D)

NO_{2}^{-} < NO_{3}^{-} < NO_{2}^{+} < NO_{2}

JEE Advanced 2017

LEVELJEE Advanced

The correct statements(s) about the oxoacids, $HClO_{4}$ and $HClO$ , is (are) -

* Multiple Correct Options

(A)

HClO_{4}

is more acidic than

HClO

because of the resonance stabilization of its anion

(B)

HClO_{4}

is formed in the reaction between

Cl_{2}

and

H_{2} O

(C)

The central atom in Both

HClO_{4}

and

HClO

sp^{3}

hybridized

(D)

The conjugate base of

HClO_{4}

is weaker base than

H_{2} O

JEE Advanced 2022

LEVELJEE Advanced

Thermal decomposition of $AgNO_{3}$ produces two paramagnetic gases. The total number of electrons present in the antibonding molecular orbitals of the gas that has the higher number of unpaired electrons is ______.

JEE Advanced 2019

LEVELJEE Advanced

Among $B_{2} H_{6}$ , $B_{3} N_{3} H_{6}$ , $N_{2} O$ , $N_{2} O_{4}$ , $H_{2} S_{2} O_{3}$ and $H_{2} S_{2} O_{8}$ , the total number of molecules containing covalent bond between two atoms of the same kind is ______.

JEE Advanced 2019

LEVELJEE Advanced

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent dipole moment at room temperature.

* Multiple Correct Options

(A)

BeCl_{2}

CO_{2}

BCl_{3}

CHCl_{3}

(B)

SO_{2}

C_{6} H_{5} Cl

H_{2} Se

BrF_{5}

(C)

BF_{3}

O_{3}

SF_{6}

XeF_{6}

(D)

NO_{2}

NH_{3}

POCl_{3}

CH_{3} Cl

JEE Advanced 2017

LEVELJEE Advanced

The sum of the number of lone pairs of electrons on each central atom in the following species is. $[T e B r_{6}]^{2 -}$ , $[B r F_{2}]^{+}$ , $S N F_{3}$ and $[X e F_{3}]^{-}$ [Atomic number : N = 7, F = 9, S = 16, Br = 35, Te = 52, Xe = 54]

JEE Advanced 2014

LEVELJEE Advanced

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is :

(A)

Be_{2}

(B)

B_{2}

(C)

C_{2}

(D)

N_{2}

JEE Advanced 2014

LEVELJEE Advanced

Hydrogen bonding plays a central role in the following phenomena

* Multiple Correct Options

(A)

Ice floats in water

(B)

Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions

(C)

Formic acid is more acidic than acetic acid

(D)

Dimerisation of acetic acid in benzene

JEE Advanced 2016

LEVELJEE Advanced

According to Molecular Orbital Theory,

* Multiple Correct Options

(A)

C_{2}^{2 -}

is expected to be diamagnetic

(B)

O_{2}^{2 +}

is expected to have a longer bond length than

O_{2}

(C)

N_{2}^{+}

and

N_{2}^{-}

have the same bond order

(D)

H e_{2}^{+}

has the same energy as two isolated He atoms

JEE Main 2019

LEVELJEE Advanced

Two pi and half sigma bonds are present in

(A)

O_{2}^{+}

(B)

N_{2}

(C)

N_{2}^{+}

(D)

O_{2}

JEE Main 2013

LEVELJEE Advanced

Stability of the species $Li_{2}$ , $Li_{2}^{-}$ and $Li_{2}^{+}$ increases in the order of

(A)

Li_{2} < Li_{2}^{+} < Li_{2}^{-}

(B)

Li_{2}^{-} < Li_{2}^{+} < Li_{2}

(C)

Li_{2} < Li_{2}^{-} < Li_{2}^{+}

(D)

Li_{2}^{-} < Li_{2} < Li_{2}^{+}

JEE Main 2019

LEVELJEE Advanced

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

(A)

O_{2} \to O_{2}^{+}

(B)

N_{2} \to N_{2}^{+}

(C)

O_{2} \to O_{2}^{2 -}

(D)

N O \to N O^{+}

JEE Main 2019

LEVELJEE Advanced

Among the following, the molecule expected to be stabilised by anion formation is $C_{2}, O_{2}, N O, F_{2}$ .

(A)

C_{2}

(B)

F_{2}

(C)

N O

(D)

O_{2}

JEE Main 2021

LEVELJEE Advanced

Number of paramagnetic oxides among the following given oxides is $Li_{2} O, Na_{2} O_{2}, KO_{2}, HgO$ and $K_{2} O$

Regarding the molecular orbital (MO) energy levels for homonuclear diatomic molecules, the INCORRECT statement(s) is(are)

* Multiple Correct Options

(A)

Bond order of

Ne_{2}

is zero.

(B)

The highest occupied molecular orbital (HOMO) of

F_{2}

σ

-type.

(C)

Bond energy of

O_{2}^{+}

is smaller than the bond energy of

O_{2}

(D)

Bond length of

Li_{2}

is larger than the bond length of

B_{2}

JEE Advanced 2016

LEVELJEE Main

The compound(s) with TWO lone pairs of electrons on the central atom is(are)

* Multiple Correct Options

(A)

BrF_{5}

(B)

ClF_{3}

(C)

XeF_{4}

(D)

SF_{4}

Micro-Topic Strategy Matrix

Bond Parameters and Resonance

Hybridisation and VSEPR Theory

Molecular Orbital Theory

Chapter Elite-20 Challenge Zone

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two 2pz​ orbitals is(are)

List-I

List-II

The correct order of ONO bond angle in the given species is :

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct statements(s) about the oxoacids, HClO4​ and HClO, is (are) -

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possess permanent dipole moment at room temperature.

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is :

Hydrogen bonding plays a central role in the following phenomena

According to Molecular Orbital Theory,

Two pi and half sigma bonds are present in

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Stability of the species Li2​, Li2−​ and Li2+​ increases in the order of

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Among the following, the molecule expected to be stabilised by anion formation is C2​,O2​,NO,F2​.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Number of paramagnetic oxides among the following given oxides is Li2​O,Na2​O2​,KO2​,HgO and K2​O

Regarding the molecular orbital (MO) energy levels for homonuclear diatomic molecules, the INCORRECT statement(s) is(are)

The compound(s) with TWO lone pairs of electrons on the central atom is(are)

For diatomic molecules, the correct statement(s) about the molecular orbitals formed by the overlap to two $2 p_{z}$ orbitals is(are)

The correct statements(s) about the oxoacids, $HClO_{4}$ and $HClO$ , is (are) -

Stability of the species $Li_{2}$ , $Li_{2}^{-}$ and $Li_{2}^{+}$ increases in the order of

Among the following, the molecule expected to be stabilised by anion formation is $C_{2}, O_{2}, N O, F_{2}$ .

Number of paramagnetic oxides among the following given oxides is $Li_{2} O, Na_{2} O_{2}, KO_{2}, HgO$ and $K_{2} O$