Question 1

Which statement best describes the main advantage of VSEPR theory over Lewis structures when representing molecules?

Accepted Answer

VSEPR theory shows the 3D structure and can predict molecular dipole moments.

Question 2

How many electron groups are around the central atom in $$	ext{PH}_3$$?

Accepted Answer

4

Question 3

What is the predicted bond angle for a molecule with a tetrahedral electron group geometry and no lone pairs?

Accepted Answer

$$109.5^	ext{o}$$

Question 4

In VSEPR theory, why do lone pairs cause greater distortion in bond angles compared to bonding pairs?

Accepted Answer

Lone pairs occupy more space and are more repulsive than bonding pairs.

Question 5

For a molecule with five electron groups (trigonal bipyramidal geometry), where should lone pairs be placed first according to VSEPR theory?

Accepted Answer

Equatorial positions

Question 6

Which of the following molecules is nonpolar due to its molecular geometry, despite having polar bonds?

Accepted Answer

$$	ext{CO}_2$$

Question 7

A molecule has the formula $$	ext{C}_2	ext{H}_2. $$What is the molecular geometry around each carbon atom?

Accepted Answer

Linear

Question 8

Which of the following is a structural isomer of propanol ($$	ext{C}_3	ext{H}_8	ext{O}$$)?

Accepted Answer

Isopropanol

Question 9

What is the relationship between the following two molecules: cis-$$	ext{Pt(NH}_3)_2	ext{Cl}_2$$ and trans-$$	ext{Pt(NH}_3)_2	ext{Cl}_2$$?

Accepted Answer

Geometric isomers

Question 10

Which statement about chiral molecules is correct?

Accepted Answer

Chiral molecules have at least one carbon atom bonded to four different groups.

Question 11

According to Valence Bond Theory (VBT), what type of bond is formed by the end-to-end overlap of atomic orbitals?

Accepted Answer

Sigma ($$\sigma) $$bond

Question 12

What is the hybridization of the central atom in $$	ext{BF}_3$$?

Accepted Answer

$$sp^2$$

Question 13

Which statement best explains why rotation around a double bond is restricted?

Accepted Answer

Double bonds consist of one sigma and one pi bond; the pi bond's electron density above and below the axis prevents rotation.

Question 14

In Molecular Orbital Theory (MOT), what does a bond order of zero indicate for a diatomic molecule?

Accepted Answer

No bond exists between the atoms.

Question 15

Which of the following molecules is predicted to be paramagnetic according to MOT?

Accepted Answer

$$	ext{O}_2$$

Question 16

Calculate the bond order for $$	ext{O}_2$$ using MOT, given the electron configuration: $$\sigma_{2s}^2\,\sigma_{2s}^*{}^2\,\sigma_{2p_z}^2\,\pi_{2p_x}^2\,\pi_{2p_y}^2\,\pi_{2p_x}^*{}^1\,\pi_{2p_y}^*{}^1.$$

Accepted Answer

2

Question 17

Which of the following best describes the difference between structural and geometric isomers?

Accepted Answer

Structural isomers have different connectivity; geometric isomers have the same connectivity but different spatial arrangement.

Question 18

Which hybridization is associated with a linear geometry in VSEPR theory?

Accepted Answer

$$sp$$

Question 19

A molecule has three electron groups and one lone pair around the central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 20

Which of the following statements about molecular orbital theory is correct?

Accepted Answer

MOT can predict properties such as magnetism and color.

Chemical Bonding II: VSEPR, Valence Bond Theory, and Molecular Orbital Theory

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