Chemical Bonding and Molecular Structure — JEE Main PYQs

Which of the following are isostructural pairs ?
(A) ${\mathrm{SO}}_4^{2-}$ and ${\mathrm{CrO}}_4^{2-}$
(B) ${\mathrm{SiCl}}_4$ and ${\mathrm{TiCl}}_4$
(C) ${\mathrm{NH}}_3$ and ${\mathrm{NO}}_3^{-}$
(D) ${\mathrm{BCl}}_3$ and ${\mathrm{BrCl}}_3$

The interaction energy of London forces between two particles is proportional to $r^x$, where $r$ is the distance between the particles. The value of $x$ is:

The bond order and magnetic behaviour of ${\mathrm{O}}_2^{-}$ ion are, respectively:

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason $\mathbf{R}$.
Assertion A: The dihedral angles in ${\mathrm{H}}_2{\mathrm{O}}_2$ in gaseous phase is $90.2^{\circ }$ and in solid phase is $111.5^{\circ }$.
Reason R: The ch …

The number of lone pairs of electrons on the central I atom in ${\mathrm{I}}_3^{-}$ is ____.

The correct set from the following in which both pairs are in correct order of melting point is :

The correct shape and $\mathrm{I}-\mathrm{I}-\mathrm{I}$ bond angles respectively in ${\mathrm{I}}_3^{-}$ion are:

The hybridisations of the atomic orbitals of nitrogen in ${\mathrm{NO}}_2^{-},{\mathrm{NO}}_2^{+}$ and ${\mathrm{NH}}_4^{+}$ respectively are:

The compound/s which will show significant intermolecular H-bonding is/are :

(a)

(b)

(c)

The number of species having non - pyramidal shape among the following is ____.
(A) ${\mathrm{SO}}_3$
(B) ${\mathrm{NO}}_3^{-}$
(C) ${\mathrm{PCl}}_3$
(D) ${\mathrm{CO}}_3^{2-}$

The correct statement about $B_2{H}_6$ is :

According to molecular orbital theory, the species among the following that does not exist is :

Match List - I with List - II:

List - I (Species)
(a) ${\mathrm{SF}}_4$
(b) ${\mathrm{IF}}_5$
(c) ${\mathrm{NO}}_2^{+}$
(d) ${\mathrm{NH}}_4^{+}$

List - II (Hybrid Orbitals)
(i) ${\mathrm{sp}}^3{\mathrm{d}}^2$
(ii) ${\mathrm{d}}^2{\mathrm{sp}}^3$
(iii) …

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Dipole - dipole interactions are the only non - covalent interactions, resulting in hydrogen bond formation.
Reason R: Fluorine is the most electronegative element a …

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

In $\stackrel{1}{\mathrm{C}}{\mathrm{H}}_2=\stackrel{2}{\mathrm{C}}=\stackrel{3}{\mathrm{C}}\mathrm{H}-\stackrel{4}{\mathrm{C}}{\mathrm{H}}_3$ molecule, the hybridization of carbon $1,2,3$ and 4 respectively are :

Match List-I with List-II.

List-I (Molecule)
(a) Ne₂
(b) N₂
(c) F₂
(d) O₂

List-II (Bond order)
(i) 1
(ii) 2
(iii) 0
(iv) 3

Choose the correct answer from the options given below :

According to molecular orbital theory, the number of unpaired electron(s) in ${\mathrm{O}}_2^{2-}$ is:

The number of hydrogen bonded water molecule(s) associated with stoichiometry ${\mathrm{CuSO}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$ is

In gaseous triethyl amine the "$-\mathrm{C}-\mathrm{N}-\mathrm{C}-$" bond angle is ______ degree.

The difference between bond orders of CO and $\mathrm{NO}{}^{+}$ is $\frac{X}{2}$ where X = ______
(Round off to the Nearest integer)

A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is:

Identify the species having one $\pi$-bond and maximum number of canonical forms from the following:

The total number of electrons in all bonding molecular orbitals of ${\mathrm{O}}_2^{2-}$ is ____.
(Round off to the Nearest Integer).

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reasons R :
Assertion A : The H-O-H bond angle in water molecule is $104.5^{\circ }$.
Reason R : The lone pair- lone pair repulsion of electrons is higher than the bond pair- bond pair repu …

The number of species below that have two lone pairs of electrons in their central atom is ____. (Round off to the nearest integer). …

Amongst the following, the linear species is:

The total number of C - C sigma bond$/\mathrm{s}$ in mesityl oxide $\left({\mathrm{C}}_6{\mathrm{H}}_{10}\mathrm{O}\right)$ is ______. (Round off to the nearest integer).

AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is ______. (Round off to the nearest integer).

In the following the correct bond order sequence is:

In the given molecule (CH₃-CH=C=O type; carbons labelled a, b, c shown in source), hybridisation of Carbon a, b and c respectively are:

The relative strength of interionic/intermolecular forces in decreasing order is

The dipole moments of ${\mathrm{CCl}}_4$, ${\mathrm{CHCl}}_3$ and ${\mathrm{CH}}_4$ are in the order

The bond order and the magnetic characteristics of ${\mathrm{CN}}^{-}$ are

The predominant intermolecular forces present in ethyl acetate, a liquid, are:

Arrange the following bonds according to their average bond energies in descending order:
$\mathrm{C}-\mathrm{Cl},\mathrm{C}-\mathrm{Br},\mathrm{C}-\mathrm{F},\mathrm{C}-\mathrm{I}$

Among the compounds A and B with molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{18}{\mathrm{O}}_3,\mathrm{A}$ is having higher boiling point the $B$. The possible structures of $A$ and $B$ are:

The number of $s{p}^2$ hybrid orbitals in a molecule of benzene is

The compound that has the largest $\mathrm{H}-\mathrm{M}-\mathrm{H}$ bond angle ( $\mathrm{M}=\mathrm{N},\mathrm{O},\mathrm{S},\mathrm{C}$ ), is

Of the species, $\mathrm{NO},{\mathrm{NO}}^{+},{\mathrm{NO}}^{2+}$ and ${\mathrm{NO}}^{-}$, the one with minimum bond strength is

If the boiling point of ${\mathrm{H}}_2\mathrm{O}$ is 373 K , the boiling point of ${\mathrm{H}}_2\mathrm{S}$ will be:

Consider the following molecules and statements related to them:

(a) (B) is more likely to be crystalline
(b) (B) has higher boiling point than (A)
(c) (B) dissolves more readily than (A) in water

Identify the correct option from below:

The potential energy curve for the ${\mathrm{H}}_2$ molecule as a function of internuclear distance is :

The intermolecular potential energy for the molecules $\mathrm{A},\mathrm{B},\mathrm{C}$ and D given below suggest that:

The molecule in which hybrid MOs involve only one d-orbital of the central atom is :

The reaction in which hybridization of the underlined atom is affected is:

The ion that has ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridization for the central atom is:

Among the following molecules / ions ${\mathrm{C}}_2^{2-},{\mathrm{N}}_2^{2-},{\mathrm{O}}_2^{2-},{\mathrm{O}}_2$ which one is diamagnetic and has the shortest bond length?

The correct statement about ${\mathrm{ICl}}_5$ and ${\mathrm{ICl}}_4^{-}$is:

Among the following, the molecule expected to be stabilized by anion formation is: