Question 1

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

Accepted Answer

A group of atoms within a molecule that has a characteristic chemical behavior and reacts similarly in different molecules.

Question 2

Which of the following compounds contains a carbon-carbon double bond functional group?

Accepted Answer

Ethylene

Question 3

Which of the following is the correct general formula for alkanes?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 4

Which of the following is NOT a type of alkane?

Accepted Answer

Aromatic alkane

Question 5

Why do larger alkanes have higher boiling and melting points compared to smaller alkanes?

Accepted Answer

Because dispersion forces increase with molecular size, requiring more energy to overcome.

Question 6

Which of the following is a constitutional isomer of butane ($$\mathrm{C}_4\mathrm{H}_{10}$$)?

Accepted Answer

2-Methylpropane

Question 7

What is the main difference between constitutional isomers and conformers?

Accepted Answer

Constitutional isomers have the same molecular formula but different connectivity, while conformers differ by rotation around single bonds.

Question 8

Which of the following best describes the staggered conformation of ethane?

Accepted Answer

All C-H bonds on one carbon are as far away as possible from those on the adjacent carbon.

Question 9

Which of the following is a correct IUPAC name for the compound shown below?

$$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}(\mathrm{CH}_3)\mathrm{CH}_2\mathrm{CH}_3$$

Accepted Answer

2-Methylpentane

Question 10

Which of the following statements about cycloalkanes is TRUE?

Accepted Answer

Cycloalkanes have the general formula $$\mathrm{C}_n\mathrm{H}_{2n}.$$

Question 11

Which of the following is a functional group with a carbon-oxygen double bond?

Accepted Answer

Ketone

Question 12

What is the main reason cyclopropane is less flexible than ethane?

Accepted Answer

Bond rotation in cyclopropane would break the ring, making it rigid and planar.

Question 13

Which of the following best describes an alkyl group?

Accepted Answer

A group formed by removing a hydrogen atom from an alkane.

Question 14

Which of the following is the correct order of steps in IUPAC nomenclature for naming alkanes?

Accepted Answer

Identify parent hydrocarbon, number the chain, identify and number substituents, write the name.

Question 15

Which of the following is a reaction that alkanes commonly undergo?

Accepted Answer

Combustion with oxygen to form $$\mathrm{CO}_2$$ and $$\mathrm{H}_2O.$$

Question 16

Which of the following best describes the difference between axial and equatorial positions in the chair conformation of cyclohexane?

Accepted Answer

Axial positions are parallel to the ring axis, while equatorial positions are in the rough plane of the ring.

Question 17

During a ring flip of cyclohexane, what happens to the axial and equatorial positions?

Accepted Answer

Axial positions become equatorial and equatorial positions become axial.

Question 18

Which of the following is a correct example of a functional group with carbon singly bonded to an electronegative atom?

Accepted Answer

Alcohol

Question 19

Which of the following is the correct formula for cyclohexane?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}$$

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

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