Question 1

Which of the following statements best describes a hydrocarbon?

Accepted Answer

A compound containing only carbon and hydrogen atoms.

Question 2

What is the general formula for a straight-chain alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

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

Accepted Answer

Low melting point

Question 4

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

Accepted Answer

22

Question 5

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

Accepted Answer

CH3CH2CH2CH3

Question 6

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

Accepted Answer

Hydrocarbons are nonpolar molecules and water is polar.

Question 7

Rank the following alkanes from lowest to highest boiling point: CH4, C2H6, C4H10, C6H14.

Accepted Answer

CH4, C2H6, C4H10, C6H14

Question 8

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

Accepted Answer

Benzene

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

Single covalent bonds between carbon atoms

Question 11

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

Accepted Answer

Each vertex or end of a line represents a carbon atom.

Question 12

Which of the following is NOT a property of hydrocarbons?

Accepted Answer

High solubility in water

Question 13

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

Accepted Answer

Organic compounds contain mostly covalent bonds, while inorganic compounds often contain ionic bonds.

Question 14

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

Accepted Answer

$$C_6H_{14}$$

Question 15

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

Accepted Answer

Propane used as a fuel for heating and cooking

Question 16

Which of the following best explains why the boiling point of alkanes increases with molecular weight?

Accepted Answer

Larger molecules have greater London dispersion forces.

Question 17

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

Accepted Answer

Heptane

Question 18

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

Accepted Answer

Organic compounds are generally highly flammable.

Question 19

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

Accepted Answer

H      H
 \    /
  C--C
 /    \
H      H

Question 20

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.

Chapter 11: Introduction to Organic Chemistry – Hydrocarbons

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