Quiz

QUIZ

1. When the SH (sulfur hydrogen) side group is a part of an organic molecule, what is the term specifically used for this?

a. Sulfhydryl b. Thiol c. Sulfide d. Sulfone

Answer: a. The sulfhydryl group is what the SH side group is called when it is attached to a larger organic molecule.

2. What name for a molecule is not the same as the other three?

a. Sulfhydryl methane b. Methanethiol c. Methyl mercaptan d. Methyl sulfide

Answer: d. Each of these is the name appropriate for the CH3SH molecule except for methyl sulfide, which is chemically not the same.

3. What is the chemical structure of a disulfide molecule?

a. RSH b. RSR’ c. HSRSH d. RSSR’

Answer: d. The chemical structure of the disulfide molecule is RSSR’, which means there are two alkyl side chains with a double S-S bond between the two alkyl groups, which may or may not be different. The term is alkyl chain one, alkyl chain two (in alphabetical order) plus “disulfide”.

4. What is the chemical structure of a sulfoxide molecule?

a. RSOR’ b. RSOOH c. RSH d. RSR’

Answer: a. The main structure of a sulfoxide molecule is the RSOR’ structure. This has four bonds around the sulfur molecule that is double-bonded molecule to oxygen like a ketone but with a sulfur atom in place of the carbonyl carbon.

5. What is the chemical structure of a thiolate?

a. NaSR b. RSR’ c. RSOOH d. RSOONa

Answer: a. NaSR is the chemical structure of a thiolate, which is the conjugate base of a thiol, named as the salt (like sodium or potassium), the alkyl group, and the word “thiolate”.

6. Sulfur compounds have a wide range of oxidation states. What is the range of oxidation states in sulfur?

a. -1 to +6 b. -2 to +8

c. -2 to zero d. -2 to +6

Answer: d. Because of the larger size of sulfur, it can have a negative or positive oxidation state. This leads to a possible oxidation status of -2 to +6.

7. The formation of the CS double bond makes the molecule called what type of molecule?

a. Sulfone b. Thione c. Mercaptan d. Sulfonate

Answer: b. A thione molecule has a double C=S bond, which is similar to a ketone molecule using sulfur instead of oxygen.

8. What is referred to as the mercapto group in sulfur chemistry?

a. SOOH b. SOH c. SH d. SOOOH

Answer: c. The mercapto group is what is also referred to as a sulfhydryl group, found on molecules also referred to as “thiols”.

9. Which type of reaction creates a disulfide bridge when glutathione reacts with two cysteine molecules in biochemical reactions?

a. Addition reaction b. Acid-base reaction c. Redox reaction d. Alkylation reaction

Answer: c. This is a simple redox reaction in which glutathione gets reduced and the cysteine molecules get oxidized.

10. What is the chemical makeup of a sulfone?

a. R2SO b. R2S c. R2O3 d. R2SO2

Answer: d. The sulfone molecule is highly oxidized, consisting of two R groups, plus two double-bonded oxygen groups that give a +2oxidation number to the sulfur atom.