Question 1

Which of the following functional groups contains a carbonyl group directly bonded to a hydrogen atom?

Accepted Answer

Aldehyde

Question 2

What is the IUPAC name for the following structure: $$\mathrm{CH_3CH_2CH_2CH_3}$$?

Accepted Answer

Butane

Question 3

Which of the following statements best explains why 2,2-dimethylbutane has a lower boiling point than hexane?

Accepted Answer

It has more branching, which decreases surface area and van der Waals interactions.

Question 4

Which of the following is a secondary (2°) carbon?

Accepted Answer

A carbon bonded to two other carbons

Question 5

What is the general formula for acyclic (straight-chain) alkanes?

Accepted Answer

$$C_nH_{2n+2}$$

Question 6

Which of the following best describes the anti conformation in a Newman projection of butane?

Accepted Answer

The two largest groups are 180° apart.

Question 7

Which type of strain is primarily responsible for the high energy of the eclipsed conformation of ethane?

Accepted Answer

Torsional strain

Question 8

How many constitutional isomers are possible for $$C_6H_{14}$$?

Accepted Answer

5

Question 9

Which of the following best explains why cyclopropane is much less stable than cyclohexane?

Accepted Answer

Cyclopropane has significant angle strain and torsional strain.

Question 10

What is the correct IUPAC name for the following bicyclic compound: a molecule with 7 carbons in the largest ring, 2 in the second largest, and 1 in the bridge?

Accepted Answer

Bicyclo[2.2.1]heptane

Question 11

Which of the following functional groups is present in acetone?

Accepted Answer

Ketone

Question 12

Which of the following statements about cyclohexane is correct?

Accepted Answer

The chair conformation is the most stable due to lack of angle and torsional strain.

Question 13

Which of the following is a correct statement about the boiling points of alkanes?

Accepted Answer

Boiling point increases as the number of carbons increases.

Question 14

Which of the following best describes a tertiary (3°) hydrogen?

Accepted Answer

A hydrogen attached to a carbon bonded to three other carbons

Question 15

Which of the following is a correct statement about cis-trans isomerism in cycloalkanes?

Accepted Answer

Cis-trans isomerism arises when two substituents are on the same or opposite sides of the ring.

Question 16

Which of the following best explains why the equatorial position is preferred for large substituents in cyclohexane?

Accepted Answer

It minimizes 1,3-diaxial interactions, reducing steric strain.

Question 17

A molecule has the formula $$C_5H_{12}. $$Which of the following is NOT a possible isomer?

Accepted Answer

Cyclopentane

Question 18

Which of the following best describes the difference between constitutional isomers and stereoisomers?

Accepted Answer

Constitutional isomers have different connectivity; stereoisomers have the same connectivity but different spatial arrangement.

Question 19

Which of the following functional groups is present in the molecule shown below? (Structure: $$\mathrm{CH_3CH_2OCH_2CH_3})$$

Accepted Answer

Ether

Question 20

Which of the following best describes the energy difference between the chair and boat conformations of cyclohexane?

Accepted Answer

The chair conformation is lower in energy due to minimized torsional and steric strain.

Organic Functional Groups and Alkanes: Structure, Properties, and Nomenclature

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