Question 1

Which of the following is the correct IUPAC name for the molecule with the formula $$\mathrm{C_5H_{12}}$$ and a structure consisting of a straight chain of five carbon atoms?

Accepted Answer

Pentane

Question 2

Consider the Newman projection of ethane ($$\mathrm{C_2H_6}) $$looking down the C–C bond. Which conformation is most stable and why?

Accepted Answer

Staggered, because it minimizes torsional strain.

Question 3

Which of the following statements about cyclohexane conformations is correct?

Accepted Answer

The chair conformation is more stable due to minimized torsional and steric strain.

Question 4

A cyclohexane ring has a methyl group at carbon 1 (axial) and a bromine at carbon 2 (equatorial). After a ring flip, what will be the positions of the methyl and bromine groups?

Accepted Answer

Methyl becomes equatorial, bromine becomes axial.

Question 5

Which of the following best describes the difference between cis- and trans-1,2-dimethylcyclopentane?

Accepted Answer

Cis: methyl groups on same side; Trans: methyl groups on opposite sides.

Question 6

Which of the following is the correct IUPAC name for a molecule with a triple bond between carbons 2 and 3 in a five-carbon chain?

Accepted Answer

2-pentyne

Question 7

According to Markovnikov's rule, in the addition of HBr to 2-methyl-2-butene, where will the bromine atom attach?

Accepted Answer

To the carbon with fewer hydrogen atoms.

Question 8

Which of the following carbocations is the most stable?

Accepted Answer

Tertiary ($$3^\circ) $$carbocation

Question 9

Which of the following reactions is an example of syn addition to an alkene?

Accepted Answer

Hydrogenation with $$\mathrm{H_2$}$$ and a metal catalyst

Question 10

A student is given a molecular formula $$\mathrm{C_4H_{10}}. $$Which of the following is NOT a possible structure for this formula?

Accepted Answer

Cyclobutane

Question 11

Which of the following best explains why the chair conformation of cyclohexane is more stable than the boat conformation?

Accepted Answer

The chair conformation has less torsional and steric strain.

Question 12

Which of the following is the correct IUPAC name for a molecule with a double bond starting at carbon 1 in a four-carbon chain?

Accepted Answer

1-butene

Question 13

Which of the following is true about the addition of $$\mathrm{Br_2$} to an $$alkene?

Accepted Answer

It is an anti addition.

Question 14

Which of the following best describes the product of the hydration of 2-methylpropene using acid-catalyzed conditions?

Accepted Answer

2-methyl-2-propanol (tert-butanol)

Question 15

Which of the following is a correct statement about the stability of alkenes?

Accepted Answer

Alkenes with more alkyl substituents on the double bond are more stable.

Question 16

Which of the following is the correct product when 1-butene reacts with $$\mathrm{HBr}$$?

Accepted Answer

2-bromobutane

Question 17

Which of the following best describes the result of a ring flip in cyclohexane?

Accepted Answer

Axial substituents become equatorial and vice versa.

Question 18

Which of the following is the correct IUPAC name for a molecule with a triple bond starting at carbon 1 in a four-carbon chain?

Accepted Answer

1-butyne

Question 19

Which of the following is a correct statement about the anti-Markovnikov addition of $$\mathrm{HBr} to an $$alkene in the presence of peroxides?

Accepted Answer

The bromine attaches to the less substituted carbon.

Alkanes, Cycloalkanes, Alkenes, and Alkynes: Structure, Nomenclature, and Reactions

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