Question 1

Which of the following statements best describes a saturated hydrocarbon?

Accepted Answer

A hydrocarbon containing only single bonds between carbon atoms.

Question 2

Given the molecular formula $$\mathrm{C_5H_{12}}$$, which of the following is the correct condensed structural formula for n-pentane?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2CH_3}$$

Question 3

Which of the following is a structural isomer of 2-methylbutane?

Accepted Answer

n-pentane

Question 4

Which functional group is present in the following molecule: $$\mathrm{CH_3CH_2OH}$$?

Accepted Answer

Alcohol

Question 5

Which of the following best describes the difference between a cycloalkane and its straight-chain alkane isomer?

Accepted Answer

A cycloalkane has two fewer hydrogen atoms than its straight-chain alkane isomer.

Question 6

Which of the following molecules contains a chiral center?

Accepted Answer

$$\mathrm{CH_3CHBrCH_2CH_3}$$

Question 7

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It lowers the activation energy, increasing the reaction rate.

Question 8

A reaction has $$\Delta G = -45\ \mathrm{kJ/mol}. $$Which of the following statements is true?

Accepted Answer

The reaction is spontaneous.

Question 9

Which of the following is the correct balanced equation for the complete combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}$$

Question 10

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes are biological catalysts that speed up reactions without being consumed.

Question 11

Which of the following is an example of an addition reaction?

Accepted Answer

Hydrogenation of ethene to ethane

Question 12

Which of the following best describes a condensation reaction?

Accepted Answer

Two molecules combine to form a larger molecule with the loss of a small molecule such as water.

Question 13

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$?

Accepted Answer

3-methylpentane

Question 14

Which of the following statements about oxidation-reduction reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 15

Which of the following is the product of the hydration of ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

Ethanol ($$\mathrm{CH_3CH_2OH})$$

Question 16

Which of the following factors will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the temperature

Question 17

Which of the following best describes a trans isomer in an alkene?

Accepted Answer

The two substituents are on opposite sides of the double bond.

Question 18

Which of the following is the correct classification for the reaction: $$\mathrm{2H_2O_2 \rightarrow 2H_2O + O_2$}$$?

Accepted Answer

Decomposition

Question 19

Which of the following statements about reversible reactions is correct?

Accepted Answer

They can proceed in both the forward and reverse directions.

Question 20

A calorimeter is used to measure which of the following?

Accepted Answer

The heat released or absorbed during a chemical reaction.

CHEM 102 Study Notes: Organic Compounds and Chemical Reactions (Chapters 4 & 5)

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