On account of the disruption in education due to the corona pandemic, we're are providing a 7-day Free trial of our platform to teachers. Know More →

JEE Advanced

Explore popular questions from Chemical Bonding and Molecular Structure for JEE Advanced. This collection covers Chemical Bonding and Molecular Structure previous year JEE Advanced questions hand picked by experienced teachers.

Select Subject

Mathematics

Physics

Chemistry

Chemical Bonding and Molecular Structure

Correct Marks 4

Incorrectly Marks -1

Q 1. Element {tex} \mathrm { X } {/tex} is strongly electropositive and element {tex} \mathrm { Y } {/tex} is strongly electronegative. Both are univalent. The compound formed would be

{tex} \mathrm { X } ^ { + }\ \mathrm { Y } ^ { - } {/tex}

B

{tex} \mathrm X ^ { - } \ \mathrm X ^ { + } {/tex}

C

{tex} \mathrm X - \mathrm Y {/tex}

D

{tex} \mathrm X \rightarrow \mathrm Y {/tex}

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 2. The species having bond order different from that in {tex} \mathrm { CO } {/tex} is

{tex} \mathrm { NO } ^ { - } {/tex}

B

{tex} \mathrm { NO } ^ { + } {/tex}

C

{tex} \mathrm { CN } ^ { - } {/tex}

D

{tex} N _ { 2} {/tex}

Explanation




Correct Marks 4

Incorrectly Marks -1

Q 3. What hybride orbitals are employed by carbon atoms {tex} 1,2 {/tex} and {tex} 3 , {/tex} respectively as labelled in the compound shown?

A

{tex} s p ^ { 3 } , s p , s p {/tex}

{tex} s p ^ { 3 } , s p ^ { 2 } , s p {/tex}

C

{tex} s p ^ { 3 } , s p , s p ^ { 2 } {/tex}

D

{tex} s p ^ { 3 } , s p ^ { 2 } , s p ^ { 2 } {/tex}

Correct Marks 4

Incorrectly Marks -1

Q 4. Which are non-polar molecules?
{tex} \mathrm { I }: \mathrm { NCl } _ { 3 } ; \quad \mathrm { II }: \mathrm { SO } _ { 3 } ; \quad \mathrm { III }: \mathrm { PCl } _ { 5 } {/tex}

A

{tex} \mathrm {I} {/tex} only

B

{tex} \mathrm {II} {/tex} only

C

{tex} \mathrm {I} {/tex} and {tex} \mathrm {II} {/tex} only

{tex} \mathrm {II} {/tex} and {tex} \mathrm {III} {/tex} only

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 5. {tex} \mathrm { C } - \mathrm { H } {/tex} bond distance is the longest in

A

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 2 } {/tex}

B

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 4 } {/tex}

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 6 } {/tex}

D

{tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 2 } \mathrm { Br } _ { 2 } {/tex}

Explanation


Correct Marks 4

Incorrectly Marks -1

Q 6. An ionic compound {tex} A ^ { + } B ^ { - } {/tex} is most likely to be formed from {tex} A {/tex} and {tex} B {/tex} when

Ionization energy of {tex} A {/tex} is low

B

Electron affinity of {tex} B {/tex} is low

C

Electronegativity of {tex} B {/tex} is low

D

Ionization energy of {tex} B {/tex} is low

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 7. Compound {tex} X {/tex} is highly volatile and insoluble in water. Bonding in {tex} X {/tex} is

A

Ionic

Covalent

C

Polar covalent

D

Coordinate

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 8. The structure of {tex} 1,3 {/tex} -butadiene is {tex} \mathrm { CH } _ { 2 } = \mathrm { CH } - \mathrm { CH } = \mathrm { CH } _ { 2 } {/tex} and the distance between the central carbon atom is {tex} 1.46 \mathrm { {\text{Å}}} \text { (instead of } 1.54 {\text{Å}} ) {/tex}. This is due to

Existence of on-octet resonance structures involving double bonding between the central carbon atoms

B

Decrease in bond length when terminal double bonds exist

C

{tex} s p ^ { 2 } - s p ^ { 2 } {/tex} overlapping

D

{tex} p - p {/tex} overlaping

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 9. In {tex} \mathrm { I } _ { 3 } ^ { - } , {/tex} Lewis base is

A

{tex} \mathrm { I } _ { 2 } {/tex}

{tex}\mathrm I ^ { - } {/tex}

C

{tex}\mathrm { I }_ { 2 } ^ { + } {/tex}

D

{tex} \mathrm { I }_{ 2 }^{-} {/tex}

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 10. Which among the following sulphates is insoluble in water?

A

{tex} \mathrm { CuSO } _ { 4 } {/tex}

B

{tex} \mathrm { CdSO } _ { 4 } {/tex}

{tex} \mathrm { PbSO } _ { 4 } {/tex}

D

{tex} \mathrm { Bi } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } {/tex}

Explanation

Correct Marks

Incorrectly Marks

Q 11.

Which represents metallic character in an element?

B

C

D

None of these

Explanation

Partially filled bonds or overlapping bonds represent metal

Correct Marks

Incorrectly Marks

Q 12.

The enolic form of acetone contain

A

bonds, bond and 1 lone pair

B

bonds, bonds and 2 lone pairs

bonds, bonds and 2 lone pairs

D

bonds, bonds and 1 lone pairs

Explanation

- bond

bond bond

Two lone pairs on O-atom

Correct Marks

Incorrectly Marks

Q 13.

The common features among the species and are

Bond order three and isoelectronic

B

Bond order three and weak field ligands

C

Bond order two and -acceptors

D

Isoelectronic and weak field ligands

Explanation


Electrons

Bond order

Ligand

14

14

14

3

3

3

Strong

Strong

weak



Correct Marks

Incorrectly Marks

Q 14.

The high density of water compared to ice is due to

Hydrogen bonding interactions

B

Dipole-dipole interactions

C

Dipole-induced dipole interactions

D

Induced dipole induced dipole interactions

Explanation

Due to H-bonding in water molecules, water has high density

Correct Marks

Incorrectly Marks

Q 15.

Among the following species, identify the isostructural pairs

A

and

B

and

and

D

and

Explanation

Thus, and are identical and and are identical

Correct Marks

Incorrectly Marks

Q 16.

Which combination will give the strongest ionic bond?

A

and

B

and

C

and

and

Explanation

Force of attraction between cation and anion is

Where, is dielectric constant of the medium. and are charges on cation and anion, and the internuclear distance

Size of

Charge on

Correct Marks

Incorrectly Marks

Q 17.

Ratio of and bonds is maximum in

A

Naphthalene

B

Tetracyano methane

Enolic form of urea

D

equal

Explanation

C

Correct Marks

Incorrectly Marks

Q 18.

In which pair or pairs is the strongest bond found in the first species?

I: II: III:

A

I only

B

II only

C

I and III only

II and III only

Explanation

Bond order

I. 1

2 Stronger

II. 3 Stronger

2.5

III. 3 Stronger

2

Larger the bond order, greater the bond energy

Correct Marks

Incorrectly Marks

Q 19.

bond in (vinyl chloride) is stabilized in the same way as in

A

Benzyl chloride

B

Benzoyl chloride

Chlorobenzene

D

Allyl chloride

Correct Marks

Incorrectly Marks

Q 20.

Select the correct statement about resonance

A

The larger the number of the contributing structures, the greater the stability of the molecule

B

Greater number of the covalent bonds add to the stability of the molecule

C

The positive charge should reside, as far as possible, on the less electronegative element

All the above are correct statements

Correct Marks

Incorrectly Marks

Q 21.

Which of the following have identical bond order?

I. II.

III. IV.

I, III

B

II, IV

C

I, II, III

D

I, IV

Explanation

Species

Electrons

Bond order

I.

14

3.0

II.

17

1.5

III.

14

3.0

IV.

12

2.0



I and II have same bond-order

Correct Marks

Incorrectly Marks

Q 22.

The geometry of the atoms in the species is best described as

Tetrahedral

B

-

C

Square

D

Trigonalbipyramidal

Correct Marks

Incorrectly Marks

Q 23.

In a Lewis dot structure, the electrons which complete an octet but are not located between two atoms are referred to as

A

Bonding pairs

B

Delta minus electrons

C

Excess electrons

Lone pairs

Correct Marks

Incorrectly Marks

Q 24.

Which one of the following compounds has the electron-pair geometry as the trigonalbipyramidal with three equatorial positions occupied by lone pairs of electrons?

A

C

D

Explanation

(a) 3 2

(b) 2 4

(c) 1 3

(d) 1 6

Correct Marks

Incorrectly Marks

Q 25.

Correct Lewis structure is

A

B

D

Explanation

In (c), octet of and O is completed as for Lewis structure

In (a), (b) and (d), octets of C, N and O as expected are not complete