Question 1

Which of the following is a characteristic of saturated hydrocarbons?

Accepted Answer

They contain only single bonds between carbon atoms.

Question 2

What is the general formula for alkanes?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

Which of the following molecular formulas could represent an alkene?

Accepted Answer

$$C_4H_8$$

Question 4

A hydrocarbon with the formula $$C_5H_{12} is $$classified as which type?

Accepted Answer

Alkane

Question 5

Which of the following structures represents an alkyne?

Accepted Answer

A molecule with a carbon-carbon triple bond

Question 6

What is the molecular formula for an alkyne with 4 carbon atoms?

Accepted Answer

$$C_4H_6$$

Question 7

Which statement best describes the bond rotation in alkanes?

Accepted Answer

C–C single bonds in alkanes can rotate freely.

Question 8

Which of the following is NOT a valid bond rotation in an alkane?

Accepted Answer

Rotating around a C=C double bond

Question 9

A student draws two structures of 1,2-dibromoethene, one with both Br atoms on the same side and one with them on opposite sides. What is true about these structures?

Accepted Answer

They are different compounds (cis and trans isomers).

Question 10

Which of the following best describes an unsaturated hydrocarbon?

Accepted Answer

A hydrocarbon containing at least one double or triple bond.

Question 11

What is the hybridization of carbon atoms in ethene ($$C_2H_4$$)?

Accepted Answer

$$sp^2$$

Question 12

Which of the following is the correct generic formula for cycloalkanes?

Accepted Answer

$$C_nH_{2n}$$

Question 13

A molecule with the formula $$C_6H_6 is $$most likely:

Accepted Answer

Aromatic

Question 14

Which of the following statements is true about the spatial orientation of alkenes?

Accepted Answer

The C=C double bond restricts rotation, leading to cis/trans isomerism.

Question 15

Which of the following is a correct molecular formula for a cycloalkane with 5 carbon atoms?

Accepted Answer

$$C_5H_{10}$$

Question 16

Which of the following is a property of aromatic hydrocarbons?

Accepted Answer

They contain alternating single and double bonds in a ring structure.

Question 17

If a hydrocarbon has the formula $$C_7H_{16}$$, what class does it belong to?

Accepted Answer

Alkane

Question 18

Which of the following best explains why alkenes can form cis/trans isomers?

Accepted Answer

The double bond restricts rotation, so substituents can be on the same or opposite sides.

Question 19

What is the hybridization of carbon atoms in ethyne ($$C_2H_2$$)?

Accepted Answer

$$sp$$

Question 20

Which of the following is a real-world application of the concept of saturated and unsaturated hydrocarbons?

Accepted Answer

Determining the health impact of fats, where saturated fats have only single bonds and unsaturated fats have double bonds.

Hydrocarbons: Structure, Classification, and Bond Rotation

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