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

What is the 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 of the following properties is most typical of organic compounds?

Accepted Answer

Low boiling point

Question 5

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

Accepted Answer

$$CH_3CH_2CH_2CH_3$$

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

2, 1, 4, 3

Question 7

Which of the following best describes a hydrocarbon?

Accepted Answer

A compound containing only carbon and hydrogen atoms

Question 8

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

Accepted Answer

Heptane

Question 9

Which of the following is NOT a property of hydrocarbons?

Accepted Answer

Soluble in water

Question 10

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

Accepted Answer

Hydrocarbons are non-polar and water is polar.

Question 11

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

Accepted Answer

Benzene

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 alkanes is FALSE?

Accepted Answer

Alkanes can contain double or triple bonds.

Question 14

A compound has the condensed formula $$CH_3CH_2CH_3. $$What is its IUPAC name?

Accepted Answer

Propane

Question 15

Which of the following best describes the trend in boiling points for straight-chain alkanes as the number of carbon atoms increases?

Accepted Answer

Boiling point increases

Question 16

Which of the following is a correct example of a molecular formula for an alkane?

Accepted Answer

$$C_4H_{10}$$

Question 17

Which of the following is a property of inorganic compounds but NOT typical of organic compounds?

Accepted Answer

Ionic bonding

Question 18

Which of the following best describes the bonding in alkanes?

Accepted Answer

Only single covalent bonds between carbon atoms

Question 19

Which of the following is the correct expanded structural formula for ethane?

Accepted Answer

H–C–C–H with each carbon bonded to three hydrogens

Question 20

Which of the following is the correct IUPAC name for $$CH_3CH_2CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Heptane

Chapter 11: Introduction to Organic Chemistry – Hydrocarbons

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