1.
What is the name of the organic compound below
Correct Answer
D. 4-ethyl-6-methylnonane
Explanation
The compound is named as "4-ethyl-6-methylnonane". It describes a nonane molecule, because the longest chain is 9 carbons long, with an ethyl group attached to the fourth carbon atom and a methyl group attached to the sixth carbon atom along the main carbon chain.
2.
Name the organic compound below
Correct Answer
A. 3,4-diethyl-2-hexene
Explanation
The correct answer is 3,4-diethyl-2-hexene because the compound has two ethyl groups (diethyl) attached to the 3rd and 4th carbon atoms of a hexene chain, and the double bond is located between the 2nd and 3rd carbon atoms (2-hexene).
3.
Which of the following structures is a ketone?
Correct Answer
A. Structure:
4.
Which of the following functional groups contain a carboxyl group?
Correct Answer
C. Carboxylic acids
Explanation
Carboxylic acids contain a carboxyl group, which is composed of a carbonyl group (C=O) and a hydroxyl group (-OH) attached to the same carbon atom. This functional group is responsible for the acidic properties of carboxylic acids, as well as their ability to form hydrogen bonds and participate in various chemical reactions. Esters, ethers, and aldehydes do not contain a carboxyl group; instead, they have different functional groups with distinct chemical properties.
5.
Which of the following shows a condensation reaction?
Correct Answer
A. Reaction:
6.
What happens to boiling point and melting point of an organic compound when it exhibits chain branching?
Correct Answer
B. boiling point decreases while melting point increases
Explanation
When an organic compound exhibits chain branching, it means that additional branches or side chains are attached to the main carbon chain. This branching disrupts the regular packing of molecules in the solid state, resulting in a decrease in the melting point. The branching also decreases the surface area available for intermolecular interactions, leading to a decrease in the boiling point. Therefore, the boiling point decreases while the melting point increases when an organic compound exhibits chain branching.
7.
Which of the following is a saturated hydrocarbon?
Correct Answer
A. Structure:
8.
An alkyne with 6 carbons will have how many hydrogen atoms?
Correct Answer
A. 10
Explanation
An alkyne with 6 carbons will have 2 hydrogen atoms bonded to each carbon atom, except for the two end carbon atoms which will have 1 hydrogen atom bonded to each. Therefore, the total number of hydrogen atoms in the alkyne will be 2(6) + 1 + 1 = 13.
9.
-dienes are the name given to compounds with
Correct Answer
C. Exactly two double bond
Explanation
The correct answer is "exactly two double bonds." The name "dienes" refers to compounds that have exactly two double bonds. This means that there are two carbon-carbon double bonds present in the molecule. It is important to note that if there is only one double bond, the compound would be called a "ene" rather than a "diene." Similarly, if there are more than two double bonds, the compound would have a different name.
10.
Organic compounds in which two hydrocarbon groups are bonded to the same atom of oxygen.
Correct Answer
A. Ether
Explanation
Ether is the correct answer because it is an organic compound in which two hydrocarbon groups are bonded to the same atom of oxygen. Ethers have the general formula R-O-R', where R and R' represent hydrocarbon groups. They are commonly used as solvents and anesthetics due to their low reactivity and volatility.