Question 1

Which statement best describes the difference between covalent and ionic bonds as depicted in the provided meme?

Accepted Answer

Covalent bonds involve sharing electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Question 2

Given the molecule in the second image, how many $$sp^3$$ and $$sp^2$$ hybridized carbons are present as drawn?

Accepted Answer

$$3\ sp^3$, 3$$\ $$sp^2$$

Question 3

For the carbons labeled A and B in the third image, what is the correct degree (primary, secondary, tertiary) designation?

Accepted Answer

A: $$2^\circ$$, B: $$1^\circ$$

Question 4

What is the electronic geometry at the circled position in the fourth image?

Accepted Answer

Trigonal planar

Question 5

What is the ideal bond angle for a carbon atom that is $$sp^3$$ hybridized, as shown in the 'Drawing Tetrahedral Atoms' image?

Accepted Answer

$$109.5^\circ$$

Question 6

When drawing a tetrahedral carbon, which angle should be drawn between the wedge and dash to avoid common mistakes?

Accepted Answer

An obtuse angle

Question 7

In the context of allene ($$H_2C=C=CH_2$), what is the hybridization of the central carbon atom?

Accepted Answer

$$sp^2$$

Question 8

Which orbitals are involved in the bond between the terminal hydrogen and the adjacent carbon in allene?

Accepted Answer

$$H(1s)$$ and $$C(sp^2$$)$$

Question 9

Why are the $$p$$ orbitals in allene ($$H_2C=C=CH_2$) considered to be orthogonal?

Accepted Answer

Because the $$p$$ orbitals on the central carbon are perpendicular to each other, allowing for two independent $$	ext{π}$$ bonds.

Question 10

Which of the following is a correct rule for drawing resonance structures?

Accepted Answer

Resonance structures must have the same number of valence electrons.

Question 11

Why does resonance increase the stability of a molecule such as acetate compared to ethoxide?

Accepted Answer

Because the negative charge is delocalized over two oxygen atoms in acetate.

Question 12

Which resonance structure contributes most to the resonance hybrid?

Accepted Answer

The structure with the least separation of charge and full octets on all atoms.

Question 13

In the acetate ion, what is the effect of resonance on the C–O bond lengths?

Accepted Answer

Both C–O bonds are equal in length due to delocalization.

Question 14

Which of the following best explains why electrons delocalize in resonance structures?

Accepted Answer

Delocalized electrons are lower in energy and increase molecular stability.

Question 15

Which of the following is NOT a valid resonance structure for the acetate ion?

Accepted Answer

A structure with a negative charge on the central carbon.

Question 16

Which of the following statements about resonance hybrids is correct?

Accepted Answer

A resonance hybrid is a weighted average of all valid resonance contributors.

Question 17

In the context of resonance, what does a 'curly arrow' represent?

Accepted Answer

The redistribution (movement) of valence electrons.

Question 18

Which of the following is a common pitfall when drawing tetrahedral carbons in 3D?

Accepted Answer

Drawing the obtuse angle between two lines instead of between wedge and dash.

Question 19

Which hybrid orbitals are used by the central carbon in allene ($$H_2C=C=CH_2$) to form sigma bonds?

Accepted Answer

$$sp^2$$

Bonding, Hybridization, and Resonance in Organic Molecules

Study Guide - Practice Questions