Question 1

Which statement best explains why the Lewis structure does NOT always denote the molecular shape of a molecule?

Accepted Answer

Lewis structures show bonding and lone pairs, but do not account for the three-dimensional arrangement caused by electron repulsion.

Question 2

According to VSEPR theory, what is the electron-domain geometry and predicted bond angle for a molecule with three electron domains around the central atom?

Accepted Answer

Trigonal planar, $$120^	ext{o}$$

Question 3

Which of the following molecules is expected to have a bent molecular geometry?

Accepted Answer

SO$$_2$$

Question 4

A molecule has four electron domains: three bonding pairs and one lone pair. What is its molecular geometry and approximate bond angle?

Accepted Answer

Trigonal pyramidal, $$107^	ext{o}$$

Question 5

Which factor causes the bond angle in H$$_2O to be $$less than the ideal tetrahedral angle?

Accepted Answer

Greater repulsion from lone pairs compared to bonding pairs

Question 6

What is the hybridization of the central atom in NH$$_3$$?

Accepted Answer

$$sp^3$$

Question 7

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

CO$$_2$$

Question 8

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule C$$_2H$_2 ($$acetylene)?

Accepted Answer

3 $$\sigma$$ bonds and 2 $$\pi$$ bonds

Question 9

Which of the following best describes the electron domain geometry and hybridization for SF$$_6$$?

Accepted Answer

Octahedral, $$sp^3d^2$

Question 10

In the molecule PF$$_5$$, where are lone pairs most likely to be placed according to VSEPR theory?

Accepted Answer

Equatorial positions

Question 11

Which statement about resonance and delocalized electrons is correct?

Accepted Answer

Delocalized electrons are shared by more than two atoms and are best described by resonance structures.

Question 12

What is the molecular geometry of ClF$$_3$$?

Accepted Answer

T-shaped

Question 13

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

XeF$$_4$$

Question 14

A molecule has two double bonds and no lone pairs on the central atom. What is its molecular geometry?

Accepted Answer

Linear

Question 15

Which hybridization corresponds to a trigonal planar electron-domain geometry?

Accepted Answer

$$sp^2$$

Question 16

In benzene (C$$_6H$_6$$), the electrons in the pi ($$\pi) $$system are:

Accepted Answer

Delocalized over all six carbon atoms

Question 17

Which of the following best describes the difference between sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

$$\sigma$$ bonds result from end-to-end overlap along the internuclear axis, while $$\pi$$ bonds result from side-to-side overlap above and below the axis.

Question 18

A molecule with five electron domains (three bonding pairs and two lone pairs) around the central atom will have which molecular geometry?

Accepted Answer

T-shaped

Question 19

Which of the following statements about hybrid orbitals is correct?

Accepted Answer

The number of hybrid orbitals formed equals the number of atomic orbitals mixed.

Question 20

Which molecule is expected to have a seesaw molecular geometry?

Accepted Answer

SF$$_4$$

Molecular Geometry and Bonding Theories – Chapter 9 Study Notes

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