Question 1

Which of the following statements best describes the difference between organic and inorganic compounds?

Accepted Answer

Organic compounds contain at least one carbon atom and usually hydrogen, while inorganic compounds are composed mostly of metals and nonmetals.

Question 2

Which of the following is the correct general formula for a straight-chain alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

A hydrocarbon used as a motor lubricant contains 10 carbon atoms. How many hydrogen atoms are present in its structure?

Accepted Answer

22

Question 4

Which property is most typical of organic compounds compared to inorganic compounds?

Accepted Answer

Non-polarity and low boiling point

Question 5

Which of the following best explains why hydrocarbons are not soluble in water?

Accepted Answer

Hydrocarbons are non-polar and water is polar.

Question 6

Rank the following alkanes from lowest to highest boiling point: CH$$_4$$, C$$_2H$_6$$, C$$_4H$_{10}$$, C$$_6H$_{14}.$$

Accepted Answer

CH$$_4$$, C$$_2H$_6$$, C$$_4H$_{10}$$, C$$_6H$_{14}$$

Question 7

Which of the following is the correct condensed formula for butane?

Accepted Answer

CH$$_3CH$_2CH$_2CH$_3$$

Question 8

Which of the following is NOT a property of hydrocarbons?

Accepted Answer

High solubility in water

Question 9

What is the IUPAC name for the alkane with the molecular formula $$C_7H_{16}$$?

Accepted Answer

Heptane

Question 10

Which of the following best describes the bonding in alkanes?

Accepted Answer

Alkanes contain only carbon-carbon single bonds.

Question 11

Which of the following is a real-life application of an alkane?

Accepted Answer

Propane used as a fuel for heating and cooking

Question 12

Which of the following is the correct line-angle formula representation for pentane?

Accepted Answer

A zig-zag line with 5 vertices

Question 13

Which of the following statements about the physical properties of alkanes is correct?

Accepted Answer

As the number of carbon atoms increases, the boiling point increases.

Question 14

Which of the following is an example of an aromatic hydrocarbon?

Accepted Answer

Benzene

Question 15

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

Accepted Answer

Alkanes contain only single bonds, while alkenes contain at least one double bond.

Question 16

A compound has the condensed formula CH$$_3CH$_2CH$_2CH$_3. $$What is its molecular formula?

Accepted Answer

$$C_4H_{10}$$

Question 17

Which of the following is a correct statement about the solubility of organic compounds?

Accepted Answer

Organic compounds are generally not soluble in water unless a polar group is present.

Question 18

Which of the following is the correct IUPAC name for CH$$_3CH$_2CH$_2CH$_2CH$_3$$?

Accepted Answer

Pentane

Question 19

Which of the following best explains why gasoline (a mixture of hydrocarbons) floats on water?

Accepted Answer

Hydrocarbons are less dense than water and are non-polar.

Question 20

Which of the following is the correct molecular formula for hexane?

Accepted Answer

$$C_6H_{14}$$

Chapter 11: Introduction to Organic Chemistry – Hydrocarbons

Study Guide - Practice Questions