Question 1

Which of the following best describes an isomer?

Accepted Answer

A molecule with the same chemical formula but a different arrangement of atoms.

Question 2

Carbon skeletons can vary in several ways. Which of the following is NOT a way carbon skeletons can differ?

Accepted Answer

Type of element bonded to carbon

Question 3

A molecule with the formula $\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$ can exist as glucose or fructose. What property allows this?

Accepted Answer

Isomerism

Question 4

Which functional group is commonly found attached to carbon skeletons and is responsible for making molecules polar and reactive?

Accepted Answer

Hydroxyl group ($\mathrm{-OH}$)

Question 5

Which of the following statements about double bonds in carbon skeletons is TRUE?

Accepted Answer

Double bonds can vary in location and change the shape of the molecule.

Question 6

A student is analyzing two molecules: one is a straight chain hydrocarbon, and the other is a branched hydrocarbon. Both have the formula $\mathrm{C}_5\mathrm{H}_{12}$. What is the relationship between these two molecules?

Accepted Answer

They are isomers.

Question 7

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

Accepted Answer

Carbon can form four covalent bonds, allowing for chains, branches, and rings.

Question 8

A molecule contains a carbon skeleton with a hydroxyl group attached. Which type of reaction is this molecule most likely to participate in?

Accepted Answer

Dehydration synthesis

Question 9

Which of the following is a real-world example of how the shape of a carbon skeleton affects biological function?

Accepted Answer

The difference between saturated and unsaturated fatty acids, which affects membrane fluidity.

Question 10

If a molecule has the formula $\mathrm{C}_4\mathrm{H}_{10}$, which of the following is a possible structure for this molecule?

Accepted Answer

A straight chain of four carbons with single bonds

Question 11

Which chemical property is most affected by the presence of functional groups on a carbon skeleton?

Accepted Answer

Reactivity

Question 12

A molecule with a carbon skeleton and a carboxyl group ($\mathrm{-COOH}$) is most likely to be classified as:

Accepted Answer

A fatty acid

Question 13

Which of the following best describes the role of isomers in biological systems?

Accepted Answer

Isomers can have different biological functions due to their structural differences.

Question 14

Which of the following molecules is most likely to be nonpolar?

Accepted Answer

A hydrocarbon chain with only carbon and hydrogen atoms

Question 15

A molecule with the formula $\mathrm{C}_3\mathrm{H}_8$ is most likely:

Accepted Answer

Propane, a simple hydrocarbon

Question 16

Which of the following is a consequence of branching in carbon skeletons?

Accepted Answer

Altered chemical reactivity and physical properties

Question 17

Which of the following best explains why molecules with the same chemical formula can have different properties?

Accepted Answer

They have different arrangements of atoms (isomerism).

Question 18

A molecule with a carbon skeleton and a phosphate group is most likely involved in which biological process?

Accepted Answer

Energy transfer in cells (e.g., ATP)

Question 19

Which of the following is a correct statement about the effect of double bonds on the shape of a molecule?

Accepted Answer

Double bonds cause the molecule to bend or kink, affecting its function.

Question 20

Which of the following is a multi-step reasoning question: If a molecule has the formula $\mathrm{C}_6\mathrm{H}_{12}$ and contains a double bond, what type of hydrocarbon is it, and how does the double bond affect its properties?

Accepted Answer

It is an alkene; the double bond makes it more reactive and changes its shape.

Carbon Compounds and Molecular Diversity

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