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Chemical Bonding & Molecular Structure

NEET Chemistry · 95 questions · Page 1 of 10 · Click an option or "Show Solution" to reveal answer

Q1
Identify the correct statement about CIF3\mathrm{CIF}_3 from the following options :
A It has T-shaped geometry with two lone pairs on Cl atom.
B It has T-shaped geometry with three lone pairs on Cl atom.
C It has a trigonal pyramidal geometry with two lone pairs on Cl atom.
D It has a planar trigonal geometry with two lone pairs on Cl atom.
Correct Answer
Option A
Solution

ClF3\mathrm{ClF}_3 has two lone pairs of electrons on Cl atom with bent T -shape structure (geometry)

Q2
 The correct formal charges on oxygen atoms numbered 2,1 and 3 respectively are :  \text{ The correct formal charges on oxygen atoms numbered } 2,1 \text{ and } 3 \text{ respectively are : }
A −1,0,+1-1,0,+1
B 0,+1,−10,+1,-1
C 0,0,00,0,0
D +1,0,−1+1,0,-1
Correct Answer
Option B
Solution

Formal charge on 2nd 2^{\text{nd }} oxygen atom =6−12(4)−4=0=6-\dfrac{1}{2}(4)-4=0 Formal charge on 1st 1^{\text{st }} oxygen atom =6−12(6)−2=+1=6-\dfrac{1}{2}(6)-2=+1 Formal charge on 3rd 3^{\text{rd }} oxygen atom =6−12(2)−6=−1=6-\dfrac{1}{2}(2)-6=-1

Q3
Which of the following molecules has NON ZERO dipole moment value?
A CCl4\mathrm{CCl}_4
B HI\mathrm{HI}
C CO2\mathrm{CO}_2
D BF3\mathrm{BF}_3
Correct Answer
Option B
Solution

<p>Dipole moment of a molecule depends both on shape and bond dipole.</p> <p> </p><table class=tg style=undefined;table-layout: fixed; width: 691px><colgroup> <col style=width: 251px> <col style=width: 193px> <col style=width: 247px> </colgroup> <thead> <tr> <th class=tg-7btt>Molecule</th> <th class=tg-7btt>Shape</th> <th class=tg-7btt>μ\mu(Debye)</th> </tr></thead> <tbody> <tr> <td class=tg-c3ow>

<br>CCl4<br><br>\mathrm{CCl}_4<br>

<br></td> <td class=tg-c3ow><img src=https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1lxzrwpv9/be910103-89f0-484c-ae71-d5807d14ec78/548db250-35e5-11ef-8763-517a7b01df3c/file-jaoe38c1lxzrwpva.png?

format=png data-orsrc=https://app-content.cdn.examgoal.net/image/jaoe38c1lxzrwpv9/be910103-89f0-484c-ae71-d5807d14ec78/548db250-35e5-11ef-8763-517a7b01df3c/file-jaoe38c1lxzrwpva.png loading=lazy style=max-width:100%;height:auto;display:block;margin:0 auto;max-height:40vh;vertical-align:baseline alt=NEET 2024 (Re-Examination) Chemistry - Chemical Bonding and Molecular Structure Question 9 English Explanation 1></td> <td class=tg-c3ow>0</td> </tr> <tr> <td class=tg-c3ow>

HI\mathrm{HI}

</td> <td class=tg-c3ow>

H−I\mathrm{H-I}

</td> <td class=tg-c3ow>0.38</td> </tr> <tr> <td class=tg-c3ow>

CO2\mathrm{CO_2}

</td> <td class=tg-c3ow>

O=C=O\mathrm{O=C=O}

</td> <td class=tg-c3ow>0</td> </tr> <tr> <td class=tg-c3ow>

BF3\mathrm{BF_3}

</td> <td class=tg-c3ow><img src=https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1lxzryj3m/660ed813-695b-460d-9c11-058925ae4b2b/86f1a120-35e5-11ef-8763-517a7b01df3c/file-jaoe38c1lxzryj3n.png?

format=png data-orsrc=https://app-content.cdn.examgoal.net/image/jaoe38c1lxzryj3m/660ed813-695b-460d-9c11-058925ae4b2b/86f1a120-35e5-11ef-8763-517a7b01df3c/file-jaoe38c1lxzryj3n.png loading=lazy style=max-width:100%;height:auto;display:block;margin:0 auto;max-height:40vh;vertical-align:baseline alt=NEET 2024 (Re-Examination) Chemistry - Chemical Bonding and Molecular Structure Question 9 English Explanation 2></td> <td class=tg-c3ow>0</td> </tr> </tbody> </table><p></p>

Q4
Arrange the following compounds in increasing order of their solubilities in chloroform: NaCl,CH3OH\mathrm{NaCl}, \mathrm{CH}_3 \mathrm{OH}, cyclohexane, CH3CN\mathrm{CH}_3 \mathrm{CN}
A NaCl<CH3CN<CH3OH<\mathrm{NaCl}<\mathrm{CH}_3 \mathrm{CN}<\mathrm{CH}_3 \mathrm{OH}< Cyclohexane
B CH3OH<CH3CN<NaCl<\mathrm{CH}_3 \mathrm{OH}<\mathrm{CH}_3 \mathrm{CN}<\mathrm{NaCl}< Cyclohexane
C NaCl<CH3OH<CH3CN<\mathrm{NaCl}<\mathrm{CH}_3 \mathrm{OH}<\mathrm{CH}_3 \mathrm{CN}< Cyclohexane
D Cyclohexane <CH3CN<CH3OH<NaCl<\mathrm{CH}_3 \mathrm{CN}<\mathrm{CH}_3 \mathrm{OH}<\mathrm{NaCl}
Correct Answer
Option A
Solution

Since

CHCl3\mathrm{CHCl}_3

is an organic solvent so, covalent (non-polar) compounds will be more soluble in it.

As the dipole moment of solute increases, solubility in chloroform decreases.

Hence increasing order of solubility. $$\mathrm{NaCl}

Q5
Identify the incorrect statement about PCl5\mathrm{PCl}_5.
A PCl5\mathrm{PCl}_5 possesses two different Cl−P−Cl\mathrm{Cl}-\mathrm{P}-\mathrm{Cl} bond angles
B All five P−Cl\mathrm{P}-\mathrm{Cl} bonds are identical in length
C PCl5\mathrm{PCl}_5 exhibits sp3ds p^3 d hybridisation
D PCl5\mathrm{PCl}_5 consists of five P−Cl\mathrm{P}-\mathrm{Cl} (sigma) bonds
Correct Answer
Option B
Solution

It is

sp3ds p^3 d

hybridised with axial to equatorial angle of

90∘90^{\circ}

and equatorial bond angles of

120∘120^{\circ}

. It has five

P−Cl\mathrm{P}-\mathrm{Cl}

sigma bonds. Axial bonds are longer than equatorial bonds.

Q6
Intramolecular hydrogen bonding is present in
A
B
C
D HF
Correct Answer
Option A
Solution

In o-nitrophenol intramolecular H-bonding is present.

Q7
Identify the correct answer.
A Three resonance structures can be drawn for ozone
B BF3\mathrm{BF}_3 has non-zero dipole moment
C Dipole moment of NF3\mathrm{NF}_3 is greater than that of NH3\mathrm{NH}_3
D Three canonical forms can be drawn for CO32−\mathrm{CO}_3^{2-} ion
Correct Answer
Option D
Solution

(1) In ozone; there are two resonating structures.

Q8
The correct order of dipole moments for molecules NH3,H2 S,CH4\mathrm{NH}_3, \mathrm{H}_2 \mathrm{~S}, \mathrm{CH}_4 and HF\mathrm{HF}, is:
A CH4>H2S>NH3>HF\mathrm{CH}_4 > \mathrm{H}_2 \mathrm{S} > \mathrm{NH}_3 > \mathrm{HF}
B H2S>NH3>HF>CH4\mathrm{H}_2 \mathrm{S} > \mathrm{NH}_3 > \mathrm{HF} > \mathrm{CH}_4
C NH3>HF>CH4>H2S\mathrm{NH}_3>\mathrm{HF}>\mathrm{CH}_4>\mathrm{H}_2 \mathrm{S}
D HF>NH3>H2 S>CH4\mathrm{HF}>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{~S}>\mathrm{CH}_4
Correct Answer
Option D
Solution
HF>NH3>H2S>CH4\mathrm{HF}>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{S}>\mathrm{CH}_4

(Non-polar)

Q9
Which one of the following represents all isoelectronic species ?
A Na+,Cl−,O−,NO+\mathrm{Na}^{+}, \mathrm{Cl}^{-}, \mathrm{O}^{-}, \mathrm{NO}^{+}
B N2O,N2O4,NO+,NO\mathrm{N}_2 \mathrm{O}, \mathrm{N}_2 \mathrm{O}_4, \mathrm{NO}^{+}, \mathrm{NO}
C Na+,Mg2+,O−,F−\mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{O}^{-}, \mathrm{F}^{-}
D Ca2+,Ar,K+,Cl−\mathrm{Ca}^{2+}, \mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-}
Correct Answer
Option D
Solution

Total numbers electrons are same

Ca+2,Ar,K+,Cl−→20\mathrm{Ca}^{+2}, \mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-} \rightarrow 20

electrons

Q10
Which one of the following statements is incorrect related to Molecular Orbital Theory?
A The π∗\pi^* antibonding molecular orbital has a node between the nuclei.
B In the formation of bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
C Molecular orbitals obtained from 2Px2 \mathrm{P}_{\mathrm{x}} and 2Py2 \mathrm{P}_{\mathrm{y}} orbitals are symmetrical around the bond axis.
D A π\pi-bonding molecular orbital has larger electron density above and below the internuclear axis.
Correct Answer
Option C
Solution

In the formation of

BMO\mathrm{BMO}

, the two electron waves of the bonding atoms reinforce each other due to constructive interference.

Molecular orbitals obtained from

2Px2 \mathrm{P}_{\mathrm{x}}

and

2Py2 \mathrm{P}_{\mathrm{y}}

orbitals are 'unsymmetrical' around bond axis.

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