Intro to Organic Chemistry and Bonding Review

A comprehensive set of practice questions covering the fundamentals of organic chemistry, functional groups, nomenclature, chemical bonding, and thermodynamics based on the lecture notes.

What are the primary elements that make up organic compounds?

Organic compounds are mainly composed of Carbon ($C$) and Hydrogen ($H$), but can also include Oxygen ($O$), Nitrogen ($N$), Sulfur ($S$), and Phosphorus ($P$).

What are some common biomolecules categorized as organic compounds?

Biomolecules such as proteins, carbohydrates, lipids, and DNA.

In organic chemistry representations, what is the difference between a molecular formula and a Lewis structure?

A molecular formula shows only the number of each atom in the molecule, while a Lewis structure shows complete connectivity, including all atoms and all bonds.

What characterizes a skeletal structure in organic chemistry?

Skeletal structures are "bare bones" representations that show bonds between carbon atoms as lines and do not show Hydrogen ($H$) atoms attached to Carbon.

Why are alkanes referred to as saturated hydrocarbons?

"Hydrocarbon" indicates they are made entirely of hydrogen and carbon, and "saturated" indicates the compounds contain only single bonds.

What is the general formula for an alkane?

$C_n H_{2n+2}$, where $n$ is the number of carbons.

What are the names and molecular formulas for the first four straight-chain alkanes?

1. Methane ($CH_4$), 2. Ethane ($C_2 H_6$), 3. Propane ($C_3 H_8$), and 4. Butane ($C_4 H_{10}$).

What is the simplest cycloalkane?

Cyclopropane ($C_3 H_6$).

What is the name of the reaction where alkanes react with oxygen to serve as a fuel source?

Combustion.

What is a functional group in organic chemistry?

A group of atoms bonded in a particular way that includes heteroatoms (elements other than $C$ and $H$).

What does the "R-group" represent in a chemical structure?

The "Rest of the molecule," which can be anything from one carbon to a more complex group.

What is a carbonyl group?

A group containing a carbon-oxygen double bond ($C=O$).

Why are alkenes and alkynes classified as unsaturated hydrocarbons?

Because they have more than one bond between two carbon atoms (double bonds for alkenes and triple bonds for alkynes).

What are terpenes?

Compounds that contain more than one carbon-carbon double bond and a multiple of $5$ carbons (e.g., $5, 10, 15, 20$).

What characterizes an aromatic compound like benzene?

Aromatic compounds have a cyclic structure where all carbon-carbon bonds are the same length, making them unusually stable.

What is the difference between saturated, monounsaturated, and polyunsaturated fatty acids?

Saturated fatty acids contain no double bonds; monounsaturated fats have one double bond; polyunsaturated fats have two or more double bonds.

What are the three basic parts of an IUPAC name for a branched-chain alkane?

Substituents (attachments) + Parent name (number of carbons in the longest continuous chain) + Suffix (family name).

What are the substituent names for the halogens Fluorine, Chlorine, Bromine, and Iodine?

Fluoro, chloro, bromo, and iodo.

Based on the transcript, how is caffeine's effect on the brain described?

Caffeine blocks the action of adenosines, which are natural brain chemicals that trigger tiredness.

What electronegativity difference determines if a bond is polar or nonpolar?

A difference of $0.4$ or less is nonpolar; a difference of $0.5$ or greater is polar.

What does the acronym BARF stand for regarding energy in bonding?

Break Absorbs, Release Forms (Bond breaking absorbs energy; bond forming releases energy).

What is the heat of reaction ($\Delta H$) formula?

$\Delta H = H_{\text{products}} - H_{\text{reactants}}$.

What is the difference between endothermic and exothermic reactions in terms of $\Delta H$?

Endothermic reactions have a positive $\Delta H$ ($+\Delta H$) because they absorb heat; exothermic reactions have a negative $\Delta H$ ($-\Delta H$) because they release heat.