Chemical Bonding and Molecular Structure — JEE Main PYQs

For the compounds:
(A) ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
(B) ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
(C) (see structure)
(D) (see structure)

The increasin …

Number of $\sigma$ and $\pi$ bonds present in ethylene molecule is respectively :

In the lewis dot structure for ${\mathrm{NO}}_2{}^{-}$, total number of valence electrons around nitrogen is ____

Match List - I with List - II.

List - I (Molecules)
(A) ICl
(B) ClF₃
(C) IF₅
(D) IF₇

List - II (Shapes)
(I) T -Shape
(II) Square pyramidal
(III) Pentagonal bipyramidal
(IV) Linear

Choose the correct answer from the options given below:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : ${\mathrm{NH}}_3$ and ${\mathrm{NF}}_3$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of …

Number of compounds from the following with zero dipole moment is ______.
$\mathrm{HF},{\mathrm{H}}_2,{\mathrm{H}}_2\mathrm{S},{\mathrm{CO}}_2,{\mathrm{NH}}_3,{\mathrm{BF}}_3,{\mathrm{CH}}_4,{\mathrm{CHCl}}_3,{\mathrm{SiF}}_4$, …

Match List I with List II :

Choose …

Match List I with List II :
| D. …

Match List I with List II :

Ch …

Number of molecules from the following which can exhibit hydrogen bonding is ____. (nearest integer)

$\mathrm{HF},{\mathrm{NH}}_3$

Given below are two statements:

Statement I: ${\mathrm{PF}}_5$ and ${\mathrm{BrF}}_5$ both exhibit ${\mathrm{sp}}^3\mathrm{d}$ hybridisation.
Statement II: Both ${\mathrm{SF}}_6$ and ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$ exhibit …

Total number of species from the following with central atom utilising $s{p}^2$ hybrid orbitals for bonding is ______. …

When ${\psi }_{\mathrm{A}}$ and ${\Psi }_{\mathrm{B}}$ are the wave functions of atomic orbitals, then ${\sigma }^{\ast }$ is represented by :

Number of molecules having bond order 2 from the following molecule is ____ .
${\mathrm{C}}_2,{\mathrm{O}}_2,{\mathrm{Be}}_2,{\mathrm{Li}}_2,{\mathrm{Ne}}_2,{\mathrm{N}}_2,{\mathrm{He}}_2$

Match List I and with List II

Number of molecules from the following which are exceptions to octet rule is ______.
${\mathrm{CO}}_2,{\mathrm{NO}}_2,{\mathrm{H}}_2{\mathrm{SO}}_4,{\mathrm{BF}}_3,{\mathrm{CH}}_4,{\mathrm{SiF}}_4,{\mathrm{ClO}}_2,{\mathrm{PCl}}_5$, …

In which one of the following pairs the central atoms exhibit ${\mathrm{sp}}^2$ hybridization?

The total number of species from the following in which one unpaired electron is present, is ____.
${\mathrm{N}}_2,{\mathrm{O}}_2,{\mathrm{C}}_2^{-},{\mathrm{O}}_2^{-},{\mathrm{O}}_2^{2-},{\mathrm{H}}_2^{+},{\mathrm{CN}}^{-},{\mathrm{He}}_2^{+}$

The correct increasing order for bond angles among ${\mathrm{BF}}_3,{\mathrm{PF}}_3$ and $\mathrm{C}\ell {\mathrm{F}}_3$ is :

Total number of electron present in $({\pi }^{\ast })$ molecular orbitals of $\mathrm{O}{}_2$, $\mathrm{O}{}_2{}^{+}$ and $\mathrm{O}{}_2{}^{-}$ is $\_\_\_\_$.

Choose the polar molecule from the following :

Sum of bond order of CO and ${\mathrm{NO}}^{+}$ is ____.

Given below are two statements :

Statement (I) : A $\pi$ bonding MO has lower electron density above and below the inter-nuclear asix.

Statement (II) : The ${\pi }^{\ast }$ antibonding MO has a node between the nuclei.

In the light of the above statements, choose the most appropr …

Select the compound from the following that will show intramolecular hydrogen bonding.

Which among the following has highest boiling point?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : ${\mathrm{PH}}_3$ has lower boiling point than ${\mathrm{NH}}_3$.
Reason (R) : In liquid state ${\mathrm{NH}}_3$ molecules are associated through vander waal' …

Arrange the bonds in order of increasing ionic character in the molecules. $\mathrm{LiF}$, ${\mathrm{K}}_2\mathrm{O}$, ${\mathrm{N}}_2$, ${\mathrm{SO}}_2$ and ${\mathrm{ClF}}_3$.

The number of molecules/ion/s having trigonal bipyramidal shape is ____.
${\mathrm{PF}}_5,{\mathrm{BrF}}_5,{\mathrm{PCl}}_5,[{\mathrm{PtCl}}_4{]}^{2-},{\mathrm{BF}}_3,\mathrm{Fe}(\mathrm{CO}{)}_5$

The number of non-polar molecules from the following is ____
$\mathrm{HF},{\mathrm{H}}_2\mathrm{O},{\mathrm{SO}}_2,{\mathrm{H}}_2,{\mathrm{CO}}_2,{\mathrm{CH}}_4,{\mathrm{NH}}_3,\mathrm{HCl},{\mathrm{CHCl}}_3,{\mathrm{BF}}_3$

Number of compounds with one lone pair of electrons on central atom amongst following is ____
${\mathrm{O}}_3,{\mathrm{H}}_2\mathrm{O},{\mathrm{SF}}_4,{\mathrm{ClF}}_3,{\mathrm{NH}}_3,{\mathrm{BrF}}_5,{\mathrm{XeF}}_4$

The number of species from the following which are paramagnetic and with bond order equal to one is ____.
${\mathrm{H}}_2,{\mathrm{He}}_2^{+},{\mathrm{O}}_2^{+},{\mathrm{N}}_2^{2-},{\mathrm{O}}_2^{2-},{\mathrm{F}}_2,{\mathrm{Ne}}_2^{+},{\mathrm{B}}_2$

The total number of anti bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecule is ____.

The total number of 'Sigma' and Pi bonds in 2-formylhex-4-enoic acid is _____.

The total number of molecules with zero dipole moment among $\mathrm{CH}{}_4$, $\mathrm{BF}{}_3$, $\mathrm{H}{}_2\mathrm{O}$, $\mathrm{HF}$, $\mathrm{NH}{}_3$, $\mathrm{CO}{}_2$ and $\mathrm{SO}{}_2$ is _____.

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals
A. have the same energy
B. have the minimum overlap
C. have same symmetry about the molecular axis
D. have different symmetry about the molecular axis
Choose t …

The number of species from the following in which the central atom uses ${\mathrm{sp}}^3$ hybrid orbitals in its bonding is ______. …

Match List-I with List-II

List-I (Molecule)
(A) ${\mathrm{BrF}}_5$
(B) ${\mathrm{H}}_2\mathrm{O}$
(C) ${\mathrm{ClF}}_3$
(D) ${\mathrm{SF}}_4$

List-II (Shape)
(I) T-shape
(II) See saw
(III) Bent
(IV) Square pyramidal

The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule

Which of the following is least ionic ?

A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is 1 $\mathring{A}$, then the fractional charge on each atom is _____ $\times 10^{-10}$ esu. (Given 1 D = $10^{-18}$ esu·cm)

The molecule/ion with square pyramidal shape is:

Given below are two statements:

Statement-I: Since fluorine is more electronegative than nitrogen, the net dipole moment of ${\mathrm{NF}}_3$ is greater than ${\mathrm{NH}}_3$.
Statement-II: In ${\mathrm{NH}}_3$, the orbital dipole due to lone pair and the dipole moment of …

The number of species from the following which have square pyramidal structure is
${\mathrm{PF}}_5,{\mathrm{BrF}}_4^{-},{\mathrm{IF}}_5;{\mathrm{BrF}}_5,{\mathrm{XeOF}}_4,{\mathrm{ICl}}_4^{-}$

In an ice crystal, each water molecule is hydrogen bonded to _____ neighbouring molecules.

The ratio of sigma and $\pi$ bonds present in pyrophosphoric acid is ____:

The number of molecules from the following which contain only two lone pair of electrons is
${\mathrm{H}}_2\mathrm{O},{\mathrm{N}}_2,\mathrm{CO},{\mathrm{XeF}}_4,{\mathrm{NH}}_3,\mathrm{NO},{\mathrm{CO}}_2,{\mathrm{F}}_2$

The number of following factors which affect the percent covalent character of the ionic bond is ______
(a) Polarising power of cation
(b) Extent of distortion of anion
(c) Polarisability of the anion
(d) Polarising power of anion

The pair from the following pairs having both compounds with net non-zero dipole moment is

The number of bent-shaped molecule/s from the following is ____
${\mathrm{N}}_3^{-},{\mathrm{NO}}_2^{-},{\mathrm{I}}_3^{-},{\mathrm{O}}_3,{\mathrm{SO}}_2$

The maximum number of lone pairs of electrons on the central atom from the following species is ____
${\mathrm{ClO}}_3^{-}$, ${\mathrm{XeF}}_4$, ${\mathrm{SF}}_4$ and ${\mathrm{I}}_3^{-}$