Chemical Bonding and Molecular Structure — JEE Main PYQs

The bond order and magnetic property of acetylide ion are same as that of

In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one?

Among the following compounds, the one which shows highest dipole moment is

${\mathrm{ClF}}_5$ at room temperature is a:

Given below are two statements:

Statement I: ${\mathrm{SO}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ both possess V-shaped structure.
Statement II: The bond angle of ${\mathrm{SO}}_2$ is less than that of ${\mathrm{H}}_2\mathrm{O}$.
In the light of the above statements, choose the most …

The covalency and oxidation state respectively of boron in $[{\mathrm{BF}}_4{]}^{-}$, are

Consider the following statements:
(A) ${\mathrm{NF}}_3$ molecule has a trigonal planar structure.
(B) Bond length of ${\mathrm{N}}_2$ is shorter than ${\mathrm{O}}_2$.
(C) Isoelectronic molecules or ions have identical bond order.
(D) Dipole moment of …

Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
A. Liquid water
B. Ice
C. Impure water

What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species : ${\mathrm{N}}_2:{\mathrm{N}}_2{}^{+};{\mathrm{O}}_2;{\mathrm{O}}_2{}^{+}$?

Statement I :- Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre.

Statement II :- The crossed arrow of the dipole moment symbolizes the direction of the shift of cha …

The number of molecules or ions from the following, which do not have odd number of electrons are ______.
(A) ${\mathrm{NO}}_2$
(B) ${\mathrm{ICl}}_4^{-}$
(C) ${\mathrm{BrF}}_3$
(D) ${\mathrm{ClO}}_2$
(E) ${\mathrm{NO}}_2^{+}$
(F) NO

According to MO theory the bond orders for ${\mathrm{O}}_2^{2-}$, CO and ${\mathrm{NO}}^{+}$ respectively, are

For ${\mathrm{OF}}_2$ molecule consider the following:
(A) Number of lone pairs on oxygen is 2.
(B) FOF angle is less than $104.5^{\circ }$.
(C) Oxidation state of O is -2.
(D) Molecule is bent 'V' shaped.
(E) Molecular geometry is linear.

Correct options are:

$\mathrm{O}-\mathrm{O}$ bond length in ${\mathrm{H}}_2{\mathrm{O}}_2$ is $\underline{\mathrm{X}}$ than the $\mathrm{O}-\mathrm{O}$ bond length in ${\mathrm{F}}_2{\mathrm{O}}_2$. The $\mathrm{O}-\mathrm{H}$ bond length in ${\mathrm{H}}_2{\mathrm{O}}_2$ is $\underline{Y}$ than t …

The Lewis acid character of boron tri halides follows the order :

Amongst the following, the number of species having the linear shape is ______.

$\mathrm{Xe}{\mathrm{F}}_2,{\mathrm{I}}_3^{+},{\mathrm{C}}_3{\mathrm{O}}_2,{\mathrm{I}}_3^{-},\mathrm{C}{\mathrm{O}}_2,\mathrm{S}{\mathrm{O}}_2,\mathrm{BeC}{\mathrm{l}}_2$ and $\mathrm{BC}{\mathrm{l}}_2^{-}$

Chlorides of which metal are soluble in organic solvents:

Boric acid is solid, whereas ${\mathrm{BF}}_3$ is gas at room temperature because of

Match List I with List II:
LIST-I (molecules/ions): A. IF₇ B. ICl₄⁻ C. XeF₆ D. XeF₂
LIST-II (No. of lone pairs of e⁻ on central atom): I. Three II. One III. Two IV. Zero
Choose the correct answer from the options given below:

Order of Covalent bond;
A. KF > KI; LiF > KF
B. KF < KI; LiF > KF
C. SnCl4 > SnCl2; CuCl > NaCl
D. LiF > KF; CuCl < NaCl
E. KF < KI; CuCl > NaCl
Choose the correct answer from the options given below:

Consider, ${\mathrm{PF}}_5,{\mathrm{BrF}}_5,{\mathrm{PCl}}_3,{\mathrm{SF}}_6,{\left[{\mathrm{ICl}}_4\right]}^{-},{\mathrm{ClF}}_3$ and ${\mathrm{IF}}_5$.

Amongst the above molecule(s)/ion(s), the number of molecule(s)/ion(s) having ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybrid …

The number of paramagnetic species among the following is ______.
${\mathrm{B}}_2,{\mathrm{Li}}_2,{\mathrm{C}}_2,{\mathrm{C}}_2^{-},{\mathrm{O}}_2^{2-},{\mathrm{O}}_2^{+}$ and ${\mathrm{He}}_2^{+}$

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Zero orbital overlap is an out of phase overlap.

Reason : It results due to different orientation/ direction of approach of orbitals.

In the light of the above st …

Amongst the following the number of oxide(s) which are paramagnetic in nature is
${\mathrm{Na}}_2\mathrm{O},{\mathrm{KO}}_2,{\mathrm{NO}}_2,{\mathrm{N}}_2\mathrm{O},{\mathrm{ClO}}_2,\mathrm{NO},{\mathrm{SO}}_2,{\mathrm{Cl}}_2\mathrm{O}$

According to MO theory, number of species/ions from the following having identical bond order is $\_\_\_\_$ :
${\mathrm{CN}}^{-},{\mathrm{NO}}^{+},{\mathrm{O}}_2,{\mathrm{O}}_2^{+},{\mathrm{O}}_2^{2+}$

The geometry around boron in the product ' B ' formed from the following reaction is
${\mathrm{BF}}_3+\mathrm{NaH}\stackrel{450\mathrm{K}}{\to }\mathrm{A}+\mathrm{NaF}$
$\mathrm{A}+{\mathrm{NMe}}_3\to \mathrm{B}$

Among the following species
N₂, N₂⁺, N₂⁻, N₂²⁻, O₂, O₂⁺, O₂⁻, O₂²⁻
the number of species showing diamagnetism is

Arrange the following in increasing order of their covalent character.
(A) ${\mathrm{CaF}}_2$
(B) ${\mathrm{CaCl}}_2$
(C) ${\mathrm{CaBr}}_2$
(D) ${\mathrm{CaI}}_2$
Choose the correct answer from the options given below.

Match List-I with List-II

List-I:
(A) ${\Psi }_{\mathrm{MO}}={\Psi }_{\mathrm{A}}-{\Psi }_{\mathrm{B}}$
(B) $\mu =\mathrm{Q}\times \mathrm{r}$
(C) $\frac{{\mathrm{N}}_{\mathrm{b}}-{\mathrm{N}}_{\mathrm{a}}}{2}$
(D) ${\Psi }_{\mathrm{MO}}={\Psi }_{\mathrm{A}}+{\Psi }_{\mathrm{B}}$

List-II:
(I …

The number of molecule(s) or ion(s) from the following having non-planar structure is ____.
$\mathrm{NO}{}_3{}^{-}$, $\mathrm{H}{}_2\mathrm{O}{}_2$, $\mathrm{BF}{}_3$, $\mathrm{PCl}{}_3$, $\mathrm{XeF}{}_4$, $\mathrm{SF}{}_4$, $\mathrm{XeO}{}_3$, $\mathrm{PH}{}_4{}^{+}$, $\mathrm{SO}{}_3$, $[\mathrm{Al}(\mathrm{OH}){}_4]{}^{-}$

Match List-I with List-II.
List-I (Species): (A) BrF₅ (B) [CrF₆]³⁻ (C) O₃ (D) PCl₅
List-II (Shape): (I) bent (II) square pyramidal (III) trigonal bipyramidal (IV) octahedral
Choose the correct answer from the options given below:

In the structure of ${\mathrm{SF}}_4$, the lone pair of electrons on $S$ is in.

Identify the incorrect statement for ${\mathrm{PCl}}_5$ from the following.

The correct order of increasing intermolecular hydrogen bond strength is

The hybridization of P exhibited in $\mathrm{PF}{}_5$ is ${\mathrm{sp}}^x{\mathrm{d}}^y$. The value of $y$ is ______.

Consider the species $\mathrm{CH}{}_4$, $\mathrm{NH}{}_4{}^{+}$ and $\mathrm{BH}{}_4{}^{-}$. Choose the correct option with respect to these species:

Number of lone pair(s) of electrons on central atom and the shape of $\mathrm{BrF}{}_3$ molecule respectively, are:

The oxide which contains an odd electron at the nitrogen atom is

Amongst ${\mathrm{SF}}_4$, ${\mathrm{XeF}}_4$, ${\mathrm{CF}}_4$ and ${\mathrm{H}}_2\mathrm{O}$, the number of species with two lone pairs of electrons is ______.

Arrange the following in the decreasing order of their covalent character :
(A) LiCl
(B) NaCl
(C) KCl
(D) CsCl

Question: Choose the most appropriate answer from the options given below :

Consider the ions/molecule
${\mathrm{O}}_2^{+},{\mathrm{O}}_2,{\mathrm{O}}_2^{-},{\mathrm{O}}_2^{2-}$
For increasing bond order the correct option is :

Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option

List-I (Shape):
(A) T-shaped
(B) Trigonal planar
(C) Square planar
(D) See-saw

List-II (Molecules):
(I) ${\mathrm{XeF}}_4$
(II) …

Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?

Number of lone pairs of electrons in the central atom of ${\mathrm{SCl}}_2,{\mathrm{O}}_3,{\mathrm{ClF}}_3$ and ${\mathrm{SF}}_6$, respectively, are :

Identify the correct statement for ${\mathrm{B}}_2{\mathrm{H}}_6$ from those given below.
(A) In ${\mathrm{B}}_2{\mathrm{H}}_6$, all B-H bonds are equivalent.
(B) In ${\mathrm{B}}_2{\mathrm{H}}_6$ there are four 3-centre-2-electron bonds.
(C) …

The correct order of bond orders of ${\mathrm{C}}_2^{2-}$, ${\mathrm{N}}_2^{2-}$ and ${\mathrm{O}}_2^{2-}$ is, respectively.

Given below are two statements.

Statement I : The presence of weaker π-bonds make alkenes less stable than alkanes.

Statement II : The strength of the double bond is greater than that of carbon-carbon single bond.

In the light of the above statements, choose the correct answer …

Amongst ${\mathrm{BeF}}_2,{\mathrm{BF}}_3,{\mathrm{H}}_2\mathrm{O},{\mathrm{NH}}_3,{\mathrm{CCl}}_4$ and HCl, the number of molecules with non-zero net dipole moment is $\_\_\_\_$.

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron ?
(A) NO
(B) ${\mathrm{N}}_2$
(C) ${\mathrm{O}}_2$
(D) ${\mathrm{C}}_2$
(E) ${\mathrm{B}}_2$

Choose the most appropriate answer from the option …

Number of electron deficient molecules among the following
${\mathrm{PH}}_3,{\mathrm{B}}_2{\mathrm{H}}_6,{\mathrm{CCl}}_4,{\mathrm{NH}}_3,\mathrm{LiH}$ and ${\mathrm{BCl}}_3$ is