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 nitrogen atom?

Accepted Answer

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

Question 3

Which of the following bonds is considered nonpolar covalent?

Accepted Answer

C–H

Question 4

Given the electronegativities: C = 2.5, O = 3.5, H = 2.1, what type of bond is present in a C–O bond?

Accepted Answer

Polar covalent

Question 5

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

Accepted Answer

$$+1$$

Question 6

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 7

What is the steric number (SN) and geometry of methane ($$CH_4$$)?

Accepted Answer

SN = 4, tetrahedral

Question 8

Which of the following molecules contains a polar covalent bond?

Accepted Answer

$$CH_3CN ($$acetonitrile)

Question 9

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

Accepted Answer

$$+1$$

Question 10

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 11

What is the bond angle in a molecule with a trigonal planar geometry?

Accepted Answer

$$120^\circ$$

Question 12

Which of the following is the correct electron configuration for a carbon atom?

Accepted Answer

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

Question 13

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve transfer of electrons; covalent bonds involve sharing of electrons

Question 14

What is the formal charge on the carbon atom in a methyl anion ($$CH_3$$^-$$)?

Accepted Answer

$$-1$$

Question 15

Which of the following bonds has the greatest difference in electronegativity between the two atoms?

Accepted Answer

C–O

Question 16

In the molecule $$CH_3CN ($$acetonitrile), what is the overall formal charge?

Accepted Answer

$$0$$

Question 17

Which of the following statements about hybridization in carbon is correct?

Accepted Answer

In acetylene ($$C_2H_2$$), carbon is $$sp$$ hybridized

Question 18

Which of the following is true about the formation of a sigma ($$\sigma) $$bond?

Accepted Answer

It is formed by the end-to-end overlap of two s orbitals

Question 19

Which of the following molecules has a linear geometry?

Accepted Answer

$$C_2H_2$$

Question 20

A molecule has a steric number of 3. What is its expected geometry?

Accepted Answer

Trigonal planar

Fundamentals of Chemical Bonding and Molecular Structure in Organic Chemistry

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