Question 1

Which of the following molecules exhibits the greatest ionic character based on dipole moment and bond length data?

Accepted Answer

Na-Cl

Question 2

What is the electron configuration of zinc (Zn, atomic number 30)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$3d^{10}$$\ $$4s^2$$

Question 3

Which hybridization is present in the central atom of BF$$_3$$ and what is the expected bond angle?

Accepted Answer

sp$$^2$$; 120°

Question 4

According to Valence Bond Theory, what type of bond is formed by the sidewise overlap of atomic orbitals?

Accepted Answer

$$\pi$$ bond

Question 5

Which molecule below is planar and exhibits resonance, as explained by sp$$^2$$ hybridization?

Accepted Answer

C$$_6H$_6$$

Question 6

What is the bond angle in methane (CH$$_4) $$and what hybridization does the central carbon atom exhibit?

Accepted Answer

109.5°; sp$$^3$$

Question 7

Which of the following statements best describes the difference between Lewis structures and Valence Bond Theory (VBT)?

Accepted Answer

VBT provides additional information about orbital overlap and hybridization, which Lewis structures lack.

Question 8

Which hybridization is associated with a trigonal bipyramidal geometry according to VSEPR and VBT?

Accepted Answer

sp$$^3d$

Question 9

A molecule of ethylene (C$$_2H$_4) is $$flat because:

Accepted Answer

The double bond restricts rotation and both carbons are sp$$^2$$ hybridized

Question 10

Which formula correctly relates dipole moment ($$\mu$$), charge ($$e$$), and bond length ($$d$$)?

Accepted Answer

$$\mu = \delta \cdot e \cdot d$$

Question 11

Which of the following isomers of 2-butene (C$$_4H$_8) $$has a higher boiling point and why?

Accepted Answer

cis-2-butene; because it is more polar

Question 12

Cyclohexane can exist in different conformations. What is the relationship between chair conformations?

Accepted Answer

They are conformers that interconvert via ring flip without breaking covalent bonds.

Question 13

Which hybridization is found in the central atom of SF$$_6$$?

Accepted Answer

sp$$^3d^2$

Question 14

What is the expected geometry and bond angle for BeCl$$_2$$ based on hybridization?

Accepted Answer

Linear; 180°

Question 15

Which of the following molecules contains both $$\sigma$$ and $$\pi$$ bonds?

Accepted Answer

C$$_2H$_4$$

Question 16

Which statement about geometric isomerism is correct?

Accepted Answer

It arises from hindered rotation about $$\pi$$ bonds.

Question 17

What is the hybridization of the central atom in NH$$_3$$ and what is the expected bond angle?

Accepted Answer

sp$$^3$$; 107°

Question 18

Which of the following best describes the molecular geometry of CO$$_3$$^{2-}$$?

Accepted Answer

Trigonal planar; sp$$^2$$ hybridization

Question 19

Which molecule below is an example of an ion with sp$$^3$$ hybridization?

Accepted Answer

NH$$_4^+$$

Question 20

Which of the following statements about the stability of conformers is correct?

Accepted Answer

Molecular Orbital Theory is required to explain the stability of conformers.

Valence Bond Theory, Hybridization, and Molecular Geometry

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