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 geometry is associated with a carbon atom that forms four single bonds, as modeled by the four red balloons in the image?

Accepted Answer

Tetrahedral

Question 3

Which of the following best describes the physical properties of alkanes?

Accepted Answer

They are non-polar and hydrophobic.

Question 4

Given the molecular formula $$\mathrm{C}_5\mathrm{H}_{12}$$, how many structural isomers are possible?

Accepted Answer

3

Question 5

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 6

Which of the following hydrocarbons will have the highest melting point?

A. $$\mathrm{C}_6\mathrm{H}_{14} ($$branched)
B. $$\mathrm{C}_6\mathrm{H}_{14} ($$straight chain)
C. $$\mathrm{C}_4\mathrm{H}_{10}
D$$. $$\mathrm{C}_8\mathrm{H}_{18}$$

Accepted Answer

B

Question 7

Which of the following best describes a conformer?

Accepted Answer

Molecules with the same molecular formula and atom connections, but different spatial arrangement due to bond rotation.

Question 8

Which of the following is NOT a general type of organic reaction?

Accepted Answer

Oxidation

Question 9

Which of the following molecules is most polar?

A. $$\mathrm{H}_3\mathrm{C}-\mathrm{CH}_3
B$$. $$\mathrm{H}_3\mathrm{C}-\mathrm{NH}_2
C$$. $$\mathrm{H}_3\mathrm{C}-\mathrm{OH}
D$$. $$\mathrm{H}_3\mathrm{C}-\mathrm{SH}$$

Accepted Answer

C

Question 10

Which of the following best explains why cis-double bonds in fatty acids lower the melting point compared to saturated fatty acids?

Accepted Answer

Cis-double bonds introduce kinks, preventing tight packing and reducing dispersion forces.

Question 11

Which of the following is true about aromatic compounds such as benzene?

Accepted Answer

They are planar with overlapping electron density above and below the ring.

Question 12

Which of the following best describes a chiral carbon?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

Which of the following reactions is responsible for the production of alcohol from an alkene in biological systems?

Accepted Answer

Hydration

Question 15

Which of the following best describes the difference between a cycloalkane and an alkene with the same number of carbons?

Accepted Answer

Cycloalkanes have two fewer hydrogens than alkanes, but the same as alkenes.

Question 16

Which of the following best explains why double and triple bonds do not rotate freely?

Accepted Answer

The pi bonds in double and triple bonds would be broken by rotation.

Question 17

Which of the following is a consequence of partial hydrogenation of unsaturated fatty acids in food processing?

Accepted Answer

Formation of trans-fats, which have properties similar to saturated fats

Question 18

Which of the following best describes a conjugated system?

Accepted Answer

A molecule with alternating double and single bonds, allowing electron delocalization

Question 19

Which of the following is the most abundant element in the human body by dry weight?

Accepted Answer

Carbon

Hydrocarbons and Their Properties: GOB Chemistry Study Notes

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