Question 1

Which of the following statements best describes a functional group in organic chemistry?

Accepted Answer

A group of atoms that determines the geometry, physical properties, and reactivity of an organic molecule.

Question 2

Which of the following molecules contains a functional group that makes it significantly more reactive than ethane?

Accepted Answer

Ethanol, because it contains a hydroxy group (–OH) with polar bonds and lone pairs.

Question 3

Which of the following is NOT a characteristic property determined by the functional group of an organic molecule?

Accepted Answer

The molecule's color in solution.

Question 4

Which of the following best explains why alkanes are generally unreactive?

Accepted Answer

They contain only C–C and C–H $$\sigma$$ bonds, with no polar bonds, lone pairs, or $$\pi$$ bonds.

Question 5

Which of the following functional groups contains a $$\pi$$ bond that is easily broken in chemical reactions?

Accepted Answer

Alkene ($$\ce{C=C})$$

Question 6

What is the main reason that heteroatoms (such as O, N, or halogens) increase the reactivity of organic molecules?

Accepted Answer

They create polar bonds and electron-deficient sites on carbon.

Question 7

Which of the following best describes the reactivity of a carbonyl group ($$\ce{C=O}$$)?

Accepted Answer

The carbonyl carbon is electrophilic due to the polar $$\ce{C=O}$$ bond, and the oxygen has lone pairs, making it nucleophilic and basic.

Question 8

Which of the following is an example of an aromatic hydrocarbon?

Accepted Answer

Benzene ($$\ce{C6H6})$$

Question 9

Which of the following statements about hydrocarbons is correct?

Accepted Answer

Alkanes have only C–C $$\sigma$$ bonds and no functional group.

Question 10

A molecule contains both an amine and a carbonyl group. Which of the following is true?

Accepted Answer

The molecule will have multiple types of reactivity due to the presence of more than one functional group.

Question 11

Which of the following best describes the effect of a $$\pi$$ bond in an organic molecule?

Accepted Answer

It makes the molecule a base and a nucleophile, and is easily broken in chemical reactions.

Question 12

Which of the following is a correct example of a functional group with a C–Z $$\sigma$$ bond, where Z is a heteroatom?

Accepted Answer

Alcohol ($$\ce{C-OH})$$

Question 13

Which of the following best explains why ethanol is more reactive than ethane?

Accepted Answer

Ethanol contains a hydroxy group with polar bonds and lone pairs, while ethane has only non-polar $$\ce{C-H}$$ and $$\ce{C-C}$$ bonds.

Question 14

Which of the following is NOT a hydrocarbon?

Accepted Answer

Methanol ($$\ce{CH3OH})$$

Question 15

Which of the following statements about the relationship between geometry and functional groups is correct?

Accepted Answer

The geometry of a molecule is determined in part by the functional group(s) present.

Question 16

Which of the following best describes the role of lone pairs on heteroatoms in organic molecules?

Accepted Answer

Lone pairs make the heteroatom a base and a nucleophile.

Question 17

Which of the following is a real-life example of a molecule containing several functional groups, leading to multiple types of reactivity?

Accepted Answer

Atenolol, which contains amide, ether, alcohol, amine, and aromatic ring functional groups.

Question 18

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

Accepted Answer

$$\ce{R-CH=CH-R'}$$

Question 19

Which of the following statements about aromatic hydrocarbons is correct?

Accepted Answer

They contain a six-membered ring with three $$\pi$$ bonds, as in benzene.

Question 20

Which of the following is a correct statement about the importance of functional groups in organic chemistry?

Accepted Answer

Functional groups determine the bonding, shape, physical properties, nomenclature, and chemical reactivity of organic molecules.

Functional Groups in Organic Chemistry: Structure, Properties, and Reactivity

Study Guide - Practice Questions