Question 1

Which of the following statements best explains why methane ($$CH_4) is a $$gas at room temperature while sodium chloride ($$NaCl) is a $$solid?

Accepted Answer

Methane is composed of covalent bonds and exists as discrete molecules with weak intermolecular forces, while sodium chloride is ionic with strong electrostatic attractions.

Question 2

Which of the following best describes the geometry and bond angle around the carbon atom in methane ($$CH_4$$)?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 3

Which of the following compounds is most likely to be soluble in water?

Accepted Answer

$$CH_3CH_2OH ($$ethanol)

Question 4

Which of the following statements about hydrocarbons is correct?

Accepted Answer

Alkanes contain only C–C single bonds and are nonpolar.

Question 5

Which functional group is present in both capsaicin and caffeine?

Accepted Answer

Amide

Question 6

What is the correct condensed formula for the following structure?

$$\begin{array}{c}
H \ \ \ \ \ H \
 \ | \ \ \ \ \ |
H-C-C-C-H \
 \ | \ \ \ \ \ |
 H \ \ \ \ \ H
\end{array}$$

Accepted Answer

$$CH_3CH_2CH_3$$

Question 7

Which of the following molecules is nonpolar despite containing polar bonds?

Accepted Answer

Dichloroacetylene ($$ClC \equiv CCl)$$

Question 8

Which of the following best describes the shape and bond angle of a water molecule ($$H_2O$$)?

Accepted Answer

Bent, $$109^\circ$$

Question 9

Which of the following is a correct statement about the solubility of cholesterol in water?

Accepted Answer

Cholesterol is insoluble in water because it has too many nonpolar C–C and C–H bonds.

Question 10

Which of the following best describes the bonding and lone pairs for a nitrogen atom in methylamine ($$CH_3NH_2$$)?

Accepted Answer

Three bonds and one lone pair

Question 11

Which of the following is the functional group present in esters?

Accepted Answer

$$RCOOR'$$

Question 12

Which of the following molecules contains a carbonyl group?

Accepted Answer

Acetone ($$CH_3COCH_3)$$

Question 13

Which of the following best explains why ethanol ($$CH_3CH_2OH) is $$more soluble in water than hexane ($$CH_3CH_2CH_2CH_2CH_2CH_3$$)?

Accepted Answer

Ethanol can hydrogen bond with water due to its $$-OH$$ group, while hexane cannot.

Question 14

Which of the following is true about the polarity of organic molecules?

Accepted Answer

A molecule is nonpolar if its bond dipoles cancel each other.

Question 15

Which of the following is a correct skeletal structure for cyclohexane?

Accepted Answer

A six-membered ring with no double bonds.

Question 16

Which of the following statements about functional groups is correct?

Accepted Answer

A functional group determines the chemical and physical properties of a molecule.

Question 17

Which of the following best describes the difference between an amide and an amine?

Accepted Answer

An amide contains a nitrogen atom directly bonded to a carbonyl group, while an amine does not.

Question 18

Which of the following best explains why capsaicin is used in topical pain-relief medicines?

Accepted Answer

Capsaicin interacts with nerve endings to reduce the sensation of pain.

Question 19

Which of the following is the correct general formula for an alkene?

Accepted Answer

$$C_nH_{2n}$$

Introduction to Organic Chemistry: Structure, Bonding, and Properties

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