$$\text{C-F} \u003e \text{C-O} \u003e \text{C-Cl} \u003e \text{C-S} \u003e \text{C-H} \u003e \text{C-C}$$

Question 1

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally due to a difference in electronegativity.

Question 2

Which of the following bonds is the most polar covalent?

Accepted Answer

$$	ext{C-F}$$

Question 3

How many valence electrons does a neutral atom of phosphorus ($$	ext{P}) $$have?

Accepted Answer

$$5$$

Question 4

Which of the following molecules cannot have all atoms with a formal charge of zero?

Accepted Answer

$$	ext{CH}_3^+$$

Question 5

What is the formal charge on the oxygen atom in the Lewis structure of $$	ext{HOBr}$$?

Accepted Answer

$$0$$

Question 6

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The real structure is a weighted average of all resonance forms.

Question 7

Which of the following atoms is the largest in size?

Accepted Answer

$$	ext{Si}$$

Question 8

What is the hybridization of the central carbon atom in $$	ext{H}_2	ext{CO} ($$formaldehyde)?

Accepted Answer

$$sp^2$$

Question 9

Which of the following best explains why $$sp^3$$ hybridized atoms have bond angles of $$109.5^\circ$$?

Accepted Answer

Because negative charges repel each other to maximize distance.

Question 10

Which of the following bonds is classified as ionic?

Accepted Answer

$$	ext{Na-Cl}$$

Question 11

A molecule has the formula $$	ext{CO}_3$$^{2-}$$. Which of the following is TRUE about its Lewis structure?

Accepted Answer

It contains resonance structures with delocalized electrons.

Question 12

Which of the following best describes the direction of a dipole moment in a polar bond?

Accepted Answer

From the less electronegative atom to the more electronegative atom.

Question 13

Which of the following is the correct order of bond polarity from most polar to least polar?

Accepted Answer

$$	ext{C-F} \u003e 	ext{C-O} \u003e 	ext{C-Cl} \u003e 	ext{C-S} \u003e 	ext{C-H} \u003e 	ext{C-C}$$

Question 14

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms are most stable when they have eight electrons in their valence shell.

Question 15

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the direct overlap of two s orbitals.

Question 16

Which of the following molecules contains a triple bond?

Accepted Answer

$$	ext{C}_2	ext{H}_2$$

Question 17

Which of the following is a consequence of resonance in organic molecules?

Accepted Answer

Delocalization of electrons, leading to increased stability.

Question 18

Which of the following best explains why negative charges tend to 'attack' positive charges in organic mechanisms?

Accepted Answer

Because electrons are attracted to regions of electron deficiency.

Question 19

Which of the following atoms is most likely to be found at the center of a Lewis structure?

Accepted Answer

The least electronegative atom (excluding hydrogen).

Question 20

Which hybridization corresponds to a bond angle of $$120^\circ$$?

Accepted Answer

$$sp^2$$

Organic Chemistry I: Chapters 1 & 2 Study Guide – Introduction and General Chemistry Foundations

Guida di studio - Domande di pratica