Question 1

Which of the following best defines organic chemistry?

Accepted Answer

The study of compounds containing carbon.

Question 2

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

Accepted Answer

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

Question 3

Which isotope of carbon is most abundant in nature?

Accepted Answer

$$^{12}C$$

Question 4

What is the formal charge on the nitrogen atom in ammonia ($$NH_3$$)?

Accepted Answer

$$0$$

Question 5

Which of the following molecules has a trigonal planar geometry?

Accepted Answer

$$BF_3$$

Question 6

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds are formed by sharing electrons between atoms.

Question 7

What is the hybridization of the central carbon atom in ethene ($$C_2H_4$$)?

Accepted Answer

$$sp^2$$

Question 8

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

Accepted Answer

A bond formed by the head-on overlap of atomic orbitals.

Question 9

Which of the following molecules is polar?

Accepted Answer

$$CH_3Cl$$

Question 10

How many $$\pi$$ bonds are present in acetylene ($$C_2H_2$$)?

Accepted Answer

2

Question 11

Which of the following best explains why $$H_2O$$ has a bent molecular geometry?

Accepted Answer

The two lone pairs on oxygen repel the bonding pairs, causing a bent shape.

Question 12

What is the bond order of the carbon-carbon bond in ethyne ($$C_2H_2$$)?

Accepted Answer

3

Question 13

Which of the following is the correct Lewis structure for carbon dioxide ($$CO_2$$)?

Accepted Answer

O=C=O

Question 14

Which of the following statements about molecular orbitals is correct?

Accepted Answer

Bonding molecular orbitals are lower in energy than the atomic orbitals from which they are formed.

Question 15

Which of the following best describes the difference between $$sp^2$$ and $$sp^3$$ hybridization?

Accepted Answer

$$sp^2$$ hybridization results in a trigonal planar geometry, while $$sp^3$$ results in a tetrahedral geometry.

Question 16

Which of the following bonds is the shortest and strongest?

Accepted Answer

$$C \equiv C ($$triple bond)

Question 17

Which of the following molecules has a net dipole moment?

Accepted Answer

$$CH_2Cl_2$$

Question 18

Which of the following is a correct statement about resonance structures?

Accepted Answer

Resonance structures are different Lewis structures for the same molecule that differ only in the placement of electrons.

Question 19

Which of the following best explains why $$CCl_4 is $$nonpolar even though it contains polar bonds?

Accepted Answer

The molecular geometry is tetrahedral, causing the bond dipoles to cancel.

Question 20

Which of the following is the correct order of bond strength from strongest to weakest?

Accepted Answer

$$C \equiv C \u003e C=C \u003e C-C$$

Introduction to Organic Chemistry: Atomic Structure, Bonding, and Molecular Structure

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