Organic Chemistry - Chapter 10
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Questions and Answers
- 1.
Organic compounds typically have high boiling points
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Organic compounds typically have low boiling points. This is because organic compounds are composed of covalently bonded carbon atoms, which have relatively low intermolecular forces. These weak forces allow organic compounds to vaporize easily and have lower boiling points compared to inorganic compounds.Rate this question:
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- 2.
___________ have two fewer hydrogen atoms than the corresponding alkanes.
- A.
Cycloalkanes
- B.
Hydrocarbons
- C.
Alkanes
- D.
Carbon
Correct Answer
A. CycloalkanesExplanation
Cycloalkanes have two fewer hydrogen atoms than the corresponding alkanes because cycloalkanes form a closed ring structure, which means that two hydrogen atoms are lost in order to form the ring. Alkanes, on the other hand, do not have a ring structure and have the maximum number of hydrogen atoms for their carbon chain length.Rate this question:
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- 3.
Cycloalkanes are named by adding the prefix _____.
- A.
Cyclo-
- B.
Hydro-
- C.
Alk-
- D.
Car-
Correct Answer
A. Cyclo-Explanation
Cycloalkanes are named by adding the prefix "cyclo-" because this prefix indicates that the molecule is a cyclic compound, meaning it has a ring structure. The prefix "cyclo-" is used to specify that the carbon atoms in the molecule are arranged in a closed loop, forming a ring. This helps to differentiate cycloalkanes from other types of hydrocarbons, such as alkanes and alkenes, which have linear or branched structures. Therefore, the correct answer is "cyclo-".Rate this question:
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- 4.
The formulas for organic componds are written with __________ first, followed by _________ and then any other elements
- A.
Carbon, hydrogen
- B.
Hydrogen, carbon
- C.
Alkanes, carbon
- D.
Carbon, alkanes
Correct Answer
A. Carbon, hydrogenExplanation
Organic compounds are composed primarily of carbon and hydrogen atoms. Therefore, when writing the formulas for organic compounds, carbon is always listed first, followed by hydrogen, and then any other elements that may be present. This is because carbon is the backbone of organic molecules, forming the structural framework, while hydrogen atoms are attached to carbon atoms to satisfy their bonding requirements.Rate this question:
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- 5.
Many __________ compounds are ionic
- A.
Organic
- B.
Inorganic
Correct Answer
B. InorganicExplanation
Inorganic compounds are generally formed by nonmetals and metals, and they often have ionic bonding. Ionic compounds are formed when one or more electrons are transferred from a metal to a nonmetal, resulting in the formation of positive and negative ions. Organic compounds, on the other hand, are primarily composed of carbon and hydrogen atoms, and they typically have covalent bonding. Therefore, the correct answer is "inorganic" because it is stating that most inorganic compounds exhibit ionic bonding.Rate this question:
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- 6.
Typically, __________ compounds are not soluble in water.
- A.
Organic
- B.
Inorganic
Correct Answer
A. OrganicExplanation
Organic compounds, which are composed primarily of carbon and hydrogen, tend to be nonpolar and do not form strong interactions with water molecules. As a result, they are generally insoluble or have low solubility in water. In contrast, inorganic compounds often contain ionic or polar covalent bonds, allowing them to interact with water molecules and dissolve more readily.Rate this question:
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- 7.
Which is a property of organic compounds?
- A.
Organic compounds melt at low temperatures and produce ions when dissolved in water.
- B.
Organic compounds have low water solubility and high flammability.
- C.
Organic compounds have low boiling points and dissolve in water.
- D.
Organic compounds produce ions in water and melt at low temperatures.
Correct Answer
B. Organic compounds have low water solubility and high flammability. -
- 8.
What statement(s) about compounds containing carbon atoms is true?
- A.
MgCO3 is an organic compound because it contains a carbon atom.
- B.
C10H22 will have a low boiling point.
- C.
CH4 will be a solid at room temperature.
- D.
HCl is an organic compound.
Correct Answer
B. C10H22 will have a low boiling point.Explanation
C10H22 will have a low boiling point because it is a hydrocarbon with a large number of carbon atoms and a high molecular weight. Generally, compounds with higher molecular weights have stronger intermolecular forces, which require more energy to break and result in higher boiling points. However, C10H22 is an alkane, which has only weak London dispersion forces between its molecules. This makes it easier for the molecules to separate and evaporate, resulting in a lower boiling point compared to compounds with stronger intermolecular forces.Rate this question:
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- 9.
Octane floats on water and MgCO3 dissolves in water. This means that
- A.
Octane is an organic compound and magnesium carbonate is an ionic compound.
- B.
Octane is an ionic compound and magnesium carbonate is an ionic compound.
- C.
Octane is an ionic compound and magnesium carbonate is an organic compound.
- D.
Octane is an organic compound and magnesium carbonate is an organic compound.
Correct Answer
A. Octane is an organic compound and magnesium carbonate is an ionic compound.Explanation
Octane is a hydrocarbon compound, which means it is composed of carbon and hydrogen atoms bonded together. Hydrocarbons are organic compounds, and they are generally nonpolar and insoluble in water. On the other hand, magnesium carbonate is an ionic compound composed of magnesium ions (Mg2+) and carbonate ions (CO32-). Ionic compounds are formed through the transfer of electrons between atoms, resulting in the formation of charged ions. They are typically soluble in water due to their ability to dissociate into ions. Therefore, based on the solubility properties and composition of octane and magnesium carbonate, octane is an organic compound and magnesium carbonate is an ionic compound.Rate this question:
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- 10.
Indicate whether the following properties are most typical of organic compounds
- A.
Not soluble in water
- B.
High boiling point
- C.
Burns in air
Correct Answer(s)
A. Not soluble in water
C. Burns in airExplanation
The properties of being not soluble in water and burning in air are typical of organic compounds. Organic compounds tend to be nonpolar or have low polarity, which makes them insoluble in water. Additionally, organic compounds contain carbon and hydrogen atoms, which can undergo combustion reactions when exposed to air, resulting in burning. On the other hand, the property of having a high boiling point is not necessarily typical of organic compounds. While some organic compounds do have high boiling points, many others have low boiling points, depending on their molecular structure and intermolecular forces.Rate this question:
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- 11.
Indicate whether the following properties are most typical of inorganic compounds
- A.
Not soluble in water
- B.
High boiling point
- C.
Burns in air
Correct Answer
B. High boiling pointExplanation
Inorganic compounds are typically characterized by having a high boiling point. This is because inorganic compounds are often made up of ionic bonds, which are strong and require a significant amount of energy to break. As a result, these compounds have high boiling points as the temperature needs to be raised significantly in order to separate the ions and convert the compound from a solid or liquid state to a gaseous state.Rate this question:
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- 12.
The ___________ are organic compounds that consist of only carbon and hydrogen.
- A.
Hydrocarbon
- B.
Alkane
- C.
Cycloalkanes
Correct Answer
A. HydrocarbonExplanation
Hydrocarbons are organic compounds that consist of only carbon and hydrogen. They are the simplest and most abundant class of organic compounds. Hydrocarbons can be found in various forms, such as alkanes and cycloalkanes. Alkanes are hydrocarbons that have only single bonds between carbon atoms, while cycloalkanes are hydrocarbons that have carbon atoms arranged in a ring structure. Therefore, hydrocarbon is the correct answer as it encompasses both alkanes and cycloalkanes.Rate this question:
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- 13.
Alkanes are a class of hydrocarbons in which the atoms are connected by __________ bonds.
- A.
Single
- B.
Double
- C.
Triple
Correct Answer
A. SingleExplanation
Alkanes are a class of hydrocarbons in which the atoms are connected by single bonds. This means that each carbon atom in an alkane is bonded to four other atoms, either carbon or hydrogen, through single covalent bonds. These single bonds allow alkanes to have a relatively low reactivity and high stability, making them less likely to undergo chemical reactions compared to other classes of hydrocarbons.Rate this question:
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- 14.
Alkanes are a class of ___________.
- A.
Hydrocarbons
- B.
Cycloalkanes
Correct Answer
A. HydrocarbonsExplanation
Alkanes are a class of hydrocarbons. Hydrocarbons are organic compounds that consist only of hydrogen and carbon atoms. Alkanes are specifically saturated hydrocarbons, meaning they contain only single bonds between carbon atoms. They are the simplest type of hydrocarbon and have the general formula CnH2n+2. Alkanes are commonly found in fossil fuels such as natural gas and petroleum.Rate this question:
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- 15.
What is the formula for an alkane that has seven carbons?
- A.
C7H7
- B.
C7H10
- C.
C7H14
- D.
C7H16
Correct Answer
D. C7H16Explanation
The formula for an alkane that has seven carbons is C7H16. Alkanes are hydrocarbons that contain only single bonds between carbon atoms. The general formula for alkanes is CnH2n+2, where n represents the number of carbon atoms. In this case, there are seven carbon atoms, so the formula becomes C7H2(7)+2 = C7H16. This means that the alkane with seven carbons will have 16 hydrogen atoms.Rate this question:
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- 16.
Which structure(s) is the condensed structure for butane?
- A.
CH3CH2CH2CH3
- B.
CH3(CH2)2CH3
- C.
CH3-CH2-CH2-CH3
- D.
All
Correct Answer
D. AllExplanation
The condensed structure for butane can be represented in multiple ways. The first option, CH3CH2CH2CH3, is the fully expanded structure where each carbon and hydrogen atom is shown individually. The second option, CH3(CH2)2CH3, is the condensed structure where the carbon chain is shown as a group (CH2) repeated twice. The third option, CH3-CH2-CH2-CH3, is another way to represent the condensed structure using dashes to show the carbon chain. All of these options accurately represent the condensed structure of butane.Rate this question:
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- 17.
A three-carbon substituent is called
- A.
Propane
- B.
Propyl
- C.
Triane
- D.
Triyl
Correct Answer
B. PropylExplanation
A three-carbon substituent is called propyl.Rate this question:
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- 18.
What is the IUPAC name for this compound?
- A.
Octane
- B.
Hexane
- C.
Heptane
- D.
Butane
Correct Answer
A. OctaneExplanation
The IUPAC name for this compound is octane because it contains eight carbon atoms. The prefix "oct-" indicates eight, and the suffix "-ane" indicates that it is an alkane with single bonds between the carbon atoms. Therefore, the correct answer is octane.Rate this question:
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- 19.
What is the IUPAC name for this compound?
- A.
Pentane
- B.
Hexane
- C.
Heptane
- D.
Butane
Correct Answer
B. HexaneExplanation
The IUPAC name for this compound is hexane because it contains six carbon atoms in its chain. The prefix "hex-" in hexane indicates the presence of six carbon atoms, and the suffix "-ane" indicates that it is an alkane with single bonds between the carbon atoms. Therefore, hexane is the correct IUPAC name for this compound.Rate this question:
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- 20.
What is the IUPAC name for this compound?
- A.
Cyclopentane
- B.
Cyclohexane
- C.
Pentane
- D.
Butane
Correct Answer
A. CyclopentaneExplanation
The IUPAC name for this compound is cyclopentane because it consists of a five-membered ring of carbon atoms. The prefix "cyclo" indicates that the carbon atoms are arranged in a ring, and the suffix "-ane" indicates that the compound contains only single bonds between the carbon atoms. Therefore, cyclopentane is the correct IUPAC name for this compound.Rate this question:
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- 21.
The substituent in the box is
- A.
Propyl
- B.
Butyl
- C.
Isopropyl
- D.
Isobutyl
Correct Answer
C. IsopropylExplanation
The substituent in the box is isopropyl because it consists of a three-carbon chain with a branch at the second carbon. The branch is a propyl group attached to the second carbon, which makes it an isopropyl group.Rate this question:
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- 22.
What is the IUPAC name of this compound?
- A.
2-bromo-3-chloropentane
- B.
3-bromo-2-chloropentane
- C.
2-chloro-3-bromopentane
- D.
3-chloro-2-bromopentane
Correct Answer
B. 3-bromo-2-chloropentaneExplanation
The bromo substituent is on carbon 3 and the chloro substituent is on carbon two. List the two substituents alphabetically, not numerically.Rate this question:
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- 23.
How would you name this compound?
- A.
Ethylcyclohexane
- B.
Ethylhexane
- C.
Methylcyclohexane
- D.
Methylcyclopentane
Correct Answer
A. EthylcyclohexaneExplanation
The compound in question is named ethylcyclohexane because it consists of a cyclohexane ring with an ethyl group attached to it. The ethyl group is a two-carbon chain, and it is attached to one of the carbon atoms in the cyclohexane ring. Therefore, the correct name for this compound is ethylcyclohexane.Rate this question:
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Oct 19, 2023Quiz Edited by
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Apr 10, 2012Quiz Created by
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