$$FC = \text{number of valence electrons} - (\text{number of lone pair electrons} + \frac{1}{2} \times \text{number of bonding electrons})$$

Question 1

Which of the following best describes the bonding in sodium chloride (NaCl)?

Accepted Answer

Transfer of electrons from Na to Cl forming an ionic bond

Question 2

What is the electron configuration of a neutral nitrogen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 3

Which of the following bonds is considered nonpolar covalent based on electronegativity difference?

Accepted Answer

C–H

Question 4

What is the formal charge on the oxygen atom in the hydronium ion ($$H_3O^+$$)?

Accepted Answer

$$+1$$

Question 5

Which statement about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A triple bond consists of one $$\sigma$$ and two $$\pi$$ bonds

Question 6

What is the bond angle in a molecule with a steric number (SN) of 4?

Accepted Answer

$$109.5^\circ$$

Question 7

Which of the following molecules contains a polar covalent bond?

Accepted Answer

$$CH_3CN$$

Question 8

Given the electronegativities: C = 2.5, O = 3.5, H = 2.1, which bond is the most polar?

Accepted Answer

C–O

Question 9

What is the formal charge on the central nitrogen atom in the ammonium ion ($$NH_4$$^+$$)?

Accepted Answer

$$+1$$

Question 10

Which hybridization corresponds to a carbon atom in methane ($$CH_4$$)?

Accepted Answer

$$sp^3$$

Question 11

Which of the following best explains why water ($$H_2O) is a $$polar molecule?

Accepted Answer

The oxygen atom is more electronegative than hydrogen, causing unequal sharing of electrons

Question 12

What is the steric number (SN) and geometry of carbon in ethylene ($$C_2H_4$$)?

Accepted Answer

SN = 3, trigonal planar

Question 13

Which of the following is the correct formula for calculating formal charge (FC)?

Accepted Answer

$$FC = 	ext{number of valence electrons} - (	ext{number of lone pair electrons} + \frac{1}{2} 	imes 	ext{number of bonding electrons})$$

Question 14

In acetonitrile ($$CH_3CN$$), what is the formal charge on the nitrogen atom?

Accepted Answer

$$+1$$

Question 15

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity is the measure of the attraction of an atom for bonding electrons in molecules compared to that of the other atom

Question 16

Which of the following molecules has a linear geometry?

Accepted Answer

$$C_2H_2$$

Question 17

What is the electron configuration of a neutral carbon atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 18

Which of the following bonds is most likely to be ionic?

Accepted Answer

Na–Cl

Question 19

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

Accepted Answer

Formed by the side-to-side overlap of two parallel p-orbitals

Question 20

Which of the following is true about the valency of oxygen?

Accepted Answer

Oxygen has a valency of 2

Fundamentals of Chemical Bonding and Molecular Structure in Organic Chemistry

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