Question 1

Which of the following statements best explains why carbon is uniquely suited to form the backbone of organic molecules?

Accepted Answer

Carbon can form long chains and rings by making stable single, double, and triple covalent bonds with itself and other elements.

Question 2

Which of the following is the correct molecular formula for a non-cyclic alkane with 7 carbon atoms?

Accepted Answer

$$\mathrm{C}_7\mathrm{H}_{16}$$

Question 3

Which of the following best describes a constitutional isomer?

Accepted Answer

Molecules with the same molecular formula but different connectivity of atoms.

Question 4

A molecule contains a carbonyl group ($$\mathrm{C}=\mathrm{O}) $$bonded to a hydrogen atom. Which functional group does this describe?

Accepted Answer

Aldehyde

Question 5

Which of the following compounds is an example of an aromatic molecule?

Accepted Answer

Benzene

Question 6

Which of the following best describes a chiral center in an organic molecule?

Accepted Answer

A carbon atom bonded to four different groups.

Question 7

Which of the following is the correct IUPAC name for a molecule with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{O}\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Diethyl ether

Question 8

Which of the following functional groups is present in both amino acids and proteins?

Accepted Answer

Amide

Question 9

A molecule with the formula $$\mathrm{C}_4\mathrm{H}_{10}$$ can exist as two different compounds: n-butane and isobutane. What type of isomerism is this?

Accepted Answer

Constitutional isomerism

Question 10

Which of the following best describes the difference between alkanes, alkenes, and alkynes?

Accepted Answer

Alkanes have only single bonds, alkenes have at least one double bond, and alkynes have at least one triple bond.

Question 11

Which of the following functional groups is responsible for the acidic properties of vinegar (acetic acid)?

Accepted Answer

Carboxylic acid

Question 12

Which of the following best describes a geometric (cis-trans) isomer?

Accepted Answer

Molecules with the same connectivity but different spatial arrangement around a double bond.

Question 13

Which of the following is a correct statement about enantiomers?

Accepted Answer

They have identical physical properties except for the direction in which they rotate plane-polarized light.

Question 14

A molecule contains the group $$\mathrm{R}-\mathrm{SH}. $$What is the name of this functional group?

Accepted Answer

Thiol

Question 15

Which of the following best describes the structure of an ether?

Accepted Answer

An oxygen atom bonded to two carbon atoms

Question 16

Which of the following molecules contains a primary amine functional group?

Accepted Answer

$$\mathrm{CH}_3\mathrm{NH}_2$$

Question 17

Which of the following best describes the difference between a ketone and an aldehyde?

Accepted Answer

A ketone has a carbonyl group bonded to two carbon atoms, while an aldehyde has a carbonyl group bonded to at least one hydrogen atom.

Question 18

Which of the following is a correct statement about the bond-line (skeletal) structure of organic molecules?

Accepted Answer

Carbon atoms are represented by the ends and intersections of lines, and hydrogen atoms bonded to carbon are usually omitted.

Question 19

A pharmaceutical company is developing a new drug that contains a chiral center. Why is it important to consider the enantiomers of this drug?

Accepted Answer

One enantiomer may be more biologically active or have different effects than the other.

Question 20

Which of the following best describes the difference between an aliphatic and an aromatic compound?

Accepted Answer

Aromatic compounds contain benzene-like ring structures, while aliphatic compounds do not.

Organic Chemistry I – Structures: Hydrocarbons, Functional Groups, and Isomerism

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