Question 1

The following illustrates an amine acting as hydrogen bond donor with water.

Accepted Answer

The image shows an amine molecule (NH2) interacting with water through hydrogen bonding, indicating that the amine can act as a hydrogen bond donor with water.

Question 2

The water solubility of heptanoic acid is less than that of potassium heptanoate.

Accepted Answer

Heptanoic acid is a weak organic acid and therefore has a lower solubility in water compared to its salt form, potassium heptanoate, which is highly soluble in water.

Question 3

Serotonin is classified as a tryptamine.

Accepted Answer

Serotonin belongs to the tryptamine class of compounds, which are characterized by a chemical structure that includes an indole ring and an amine group.

Question 4

One of the necessary components for fatty acid synthesis is a complex of malonic acid (shown below) and CoA.  The structure of this complex at physiological pH would be:

Accepted Answer

The given structure is actually that of malonyl-CoA, not a complex of malonic acid and CoA.

Question 5

Compounds such as morphine (an amine) are often administered to a patient as a salt because the salt is more soluble in body fluids.

Accepted Answer

This is true. Salts of amines such as morphine are more soluble in body fluids than their free base forms, making them more easily absorbed and thus more effective as drugs.

Question 6

The ketone carbonyl group in the following compound is on the α carbon atom.

Accepted Answer

The answer of The ketone carbonyl group in the following...

Question 7

The structure of isoleucine is  The zwitterion form of the amino acid isoleucine is

Accepted Answer

The zwitterion form of isoleucine has a slightly different structure than the non-zwitterion form, and the provided structures in the question reflect those differences. Therefore, the statement is true.

Question 8

The amine shown below is a tertiary amine.

Accepted Answer

The answer of The amine shown below is a tertiary...

Question 9

The following represents the general structure of a thioester.

Accepted Answer

The general structure of a thioester includes a carbonyl group (C=O) and a sulfur atom (S) bonded to a carbon atom (C).

Question 10

Certain amines called tryptamines, have an effect on the central nervous system and share a common structural feature.

Accepted Answer

Tryptamines, such as serotonin and DMT, have a common indole ring structure and affect the central nervous system.

Question 11

The salt of propanoic acid and the sodium ion would be named as sodium propanoate.

Accepted Answer

The naming convention for salts of carboxylic acids involves replacing the "ic" ending of the acid name with "-ate" and specifying the cation name. So, sodium propanoate is the correct name for the salt of propanoic acid and the sodium ion.

Question 12

The hexanoate ion has the formula:

Accepted Answer

The formula given in the question seems to be a random string of characters and numbers, which does not correspond to the formula of any known ion. Therefore, the statement cannot be determined as true or false based on the given information.

Question 13

The formula for cyclopentylamine is:

Accepted Answer

The formula for cyclopentylamine is C5H11N.

Question 14

Which of the following would not be soluble in water?

Accepted Answer

Nonanoic acid is less soluble in water compared to potassium nonanoate and sodium nonanoate due to its long hydrocarbon chain and weaker interaction with water molecules.

Question 15

Which of the following is the molecular formula for the salt of the magnesium ion and the propanoate anion?

Accepted Answer

The answer of Which of the following is the molecular...

Question 16

When diethylamine ionizes in water, a product of the reaction is:

Accepted Answer

When diethylamine ionizes in water, the products of the reaction are the diethylammonium ion (C4H11N+), which is a cation, and the hydroxide ion (OH-), which is an anion.

Question 17

Only amino acids can form zwitterions.

Accepted Answer

Other compounds, such as betaines and certain alkaloids, can also form zwitterions, not just amino acids.

Question 18

In decarboxylation reactions, the carboxylic acid group produces carbon dioxide.

Accepted Answer

Decarboxylation reactions involve the removal of a carboxylic acid group, which produces carbon dioxide as a byproduct.

Question 19

The following compound contains a thioester bond.

Accepted Answer

Thioester bond is a type of covalent bond between a carboxylic acid and a thiol. The compound given in the question has a thioester bond.

Question 20

When phenol dissolves in water, it functions as

Accepted Answer

Phenol is a weak acid because it can donate a proton (H+) to water. This forms the phenolate ion (C6H5O-) and a hydronium ion (H3O+), resulting in an acidic solution.

Quiz 12: Organic Acids and Bases