Question 1

Which of the following statements best explains why carbon is able to form such a wide variety of stable organic molecules?

Accepted Answer

Carbon is tetravalent, allowing it to form four covalent bonds with a variety of atoms.

Question 2

Which of the following best describes the geometry around a carbon atom with four single bonds, as modeled by the four red balloons in the image?

Accepted Answer

Tetrahedral

Question 3

Which of the following is the correct general formula for an alkane hydrocarbon?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n+2}$$

Question 4

Which type of reaction is represented by the following equation?

$$\mathrm{C}_2\mathrm{H}_4 + \mathrm{H}_2 \rightarrow \mathrm{C}_2\mathrm{H}_6$$

Accepted Answer

Addition

Question 5

A hydrocarbon with the formula $$\mathrm{C}_6\mathrm{H}_{14} is $$most likely:

Accepted Answer

An alkane

Question 6

Which of the following molecules would have the highest boiling point, assuming all are hydrocarbons?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{14} ($$straight chain)

Question 7

Which of the following best describes the difference between a structural isomer and a conformer?

Accepted Answer

Structural isomers have the same molecular formula but different atom connections; conformers differ only by rotation around single bonds.

Question 8

Which of the following statements about cycloalkanes is TRUE?

Accepted Answer

Cycloalkanes have limited bond rotation, allowing for cis-trans isomerism.

Question 9

Which of the following best explains why unsaturated fatty acids (with cis double bonds) are liquid at room temperature, while saturated fatty acids are solid?

Accepted Answer

Cis double bonds introduce kinks, preventing tight packing and lowering melting point.

Question 10

Which of the following is NOT a property of aromatic compounds such as benzene?

Accepted Answer

They are highly reactive in addition reactions.

Question 11

Which of the following best describes the product of the hydration of an alkene?

Accepted Answer

An alcohol

Question 12

Which of the following is a consequence of partial hydrogenation of vegetable oils in food processing?

Accepted Answer

Increase in the amount of trans fats

Question 13

Which of the following best describes a chiral carbon?

Accepted Answer

A carbon atom with four different groups attached in a tetrahedral geometry

Question 14

Which of the following is true about conjugated double bonds?

Accepted Answer

They involve alternating single and double bonds, allowing electron delocalization.

Question 15

Which of the following best explains why alkanes are considered the least reactive class of hydrocarbons?

Accepted Answer

All carbon atoms are saturated with hydrogens, making them stable and resistant to addition reactions.

Question 16

Which of the following is a real-life application of the combustion reaction of alkanes?

Accepted Answer

The use of methane gas for heating and cooking, producing $$\mathrm{CO}_2$$ and $$\mathrm{H}_2\mathrm{O}.$$

Question 17

Which of the following best describes the geometry around a carbon atom in ethene ($$\mathrm{C}_2\mathrm{H}_4$$)?

Accepted Answer

Trigonal planar

Question 18

Which of the following is a correct statement about cis-trans isomerism in alkenes?

Accepted Answer

Cis-trans isomerism occurs because double bonds cannot rotate freely.

Hydrocarbons: Structure, Properties, and Reactions in GOB Chemistry

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