# 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.

## Chemistry

Chemical Bonding and Molecular Structure

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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

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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

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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}

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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

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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

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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

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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

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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

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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

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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

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Q 11.

Which represents metallic character in an element?

B

C

D

None of these

##### Explanation

Partially filled bonds or overlapping bonds represent metal

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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

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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

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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

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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

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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

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Q 17.

Ratio of and bonds is maximum in

A

Naphthalene

B

Tetracyano methane

Enolic form of urea

D

equal

##### Explanation

C

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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

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Q 19.

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

A

Benzyl chloride

B

Benzoyl chloride

Chlorobenzene

D

Allyl chloride

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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

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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

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Q 22.

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

Tetrahedral

B

-

C

Square

D

Trigonalbipyramidal

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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

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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

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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