Introduction to Organic Molecules and Alkanes

Comprehensive practice flashcards covering introductory organic chemistry concepts, structures, bonding patterns, IUPAC nomenclature of acyclic and cyclic alkanes, physical properties, and combustion reactions.

Organic Chemistry

The branch of chemistry dedicated to the study of compounds that contain the element carbon.

Organic Compounds

Molecules that contain carbon atoms and mostly hydrogen atoms, composed of covalent bonds and existing as discrete molecules with relatively weak intermolecular forces.

Inorganic Compounds

Compounds composed largely of ionic bonds or lacking carbon-hydrogen frameworks, exhibiting very strong ionic interactions.

Propane ($C_3H_8$)

An organic alkane compound composed of covalent bonds that is commonly stored in pressurized tanks and used as a fuel.

Sodium Chloride ($NaCl$)

An inorganic ionic compound composed of $Na^+$ and $Cl^-$ ions arranged in a rigid crystal lattice.

Discrete Molecules

Individual, distinct molecular units held together internally by covalent bonds, characteristic of organic compounds.

Covalent Bonding in Organic Compounds

The sharing of electron pairs between nonmetal atoms that forms discrete molecular units in organic chemistry.

Ionic Bonding in Inorganic Compounds

Electrostatic attractions between positively and negatively charged ions forming extended three-dimensional crystal lattices.

Intermolecular Forces in Organic Compounds

Non-covalent forces acting between individual molecules, which are significantly weaker than the electrostatic forces in ionic compounds.

Physical State of Butane ($CH_3CH_2CH_2CH_3$)

Gas at room temperature due to its low molecular weight and weak intermolecular attractions.

Physical State of Sodium Chloride ($NaCl$)

Solid at room temperature because of strong ionic forces holding the crystal lattice together.

Boiling Point of Butane

Low boiling point of $-0.5\,^{\circ}\text{C}$.

Boiling Point of Sodium Chloride

High boiling point of $1413\,^{\circ}\text{C}$.

Melting Point of Butane

Low melting point of $-138\,^{\circ}\text{C}$.

Melting Point of Sodium Chloride

High melting point of $801\,^{\circ}\text{C}$.

Water Solubility of Butane

Insoluble in water due to nonpolar hydrocarbon bonding.

Water Solubility of Sodium Chloride

Soluble in water because polar water molecules stabilize the separated ions.

Organic Solvent Solubility of Butane

Soluble in organic solvents due to matching nonpolar characteristics.

Organic Solvent Solubility of Sodium Chloride

Insoluble in organic solvents because nonpolar solvents cannot overcome strong ionic lattice attractions.

Flammability of Butane

Flammable; readily burns in the presence of oxygen.

Flammability of Sodium Chloride

Nonflammable; does not burn in oxygen.

Carbon Valence Electrons

Four valence electrons, allowing each carbon atom to form four covalent bonds.

Hydrogen Valence Electron

A single valence electron, meaning hydrogen can only form one single covalent bond.

Single Bond

A two-electron covalent bond formed by the sharing of one electron pair between two atoms.

Double Bond

A four-electron covalent bond formed by the sharing of two pairs of electrons between two atoms.

Triple Bond

A six-electron covalent bond formed by the sharing of three pairs of electrons between two atoms.

Ethane

A two-carbon hydrocarbon with the formula $CH_3CH_3$ in which each carbon forms four single bonds.

Ethylene

A two-carbon hydrocarbon with the formula $CH_2=CH_2$ that contains a carbon-carbon double bond; used as starting material to prepare polyethylene.

Acetylene

A two-carbon hydrocarbon with the formula $HC \equiv CH$ that contains a carbon-carbon triple bond.

Methane ($CH_4$)

The simplest one-carbon alkane and the primary component of natural gas.

Natural Gas

A gaseous fossil fuel composed mostly of methane, burned in the presence of oxygen to release heat for cooking and warming homes.

Polyethylene

A synthetic plastic polymer prepared using ethylene as the chemical starting material.

Acyclic Organic Compounds

Organic molecules that consist of linear or branched chains of carbon atoms without containing any closed rings.

Cyclic Organic Compounds

Organic molecules in which carbon atoms are bonded together to form one or more closed rings.

Cyclopropane ($C_3H_6$)

A cyclic alkane consisting of three carbon atoms bonded into a ring structure.

Heteroatom

Any atom present in an organic compound that is neither carbon nor hydrogen.

Octet Rule for Heteroatoms

The principle stating that common heteroatoms possess an arrangement where $\text{number of bonds} + \text{number of lone pairs} = 4$, totaling eight electrons.

Nonbonded Electron Pairs (Lone Pairs)

Pairs of valence electrons on an atom that do not participate in covalent chemical bonding.

Bonding Pattern of Hydrogen in Organic Compounds

Forms 1 bond and has 0 nonbonded electron pairs.

Bonding Pattern of Carbon in Organic Compounds

Forms 4 bonds and has 0 nonbonded electron pairs.

Bonding Pattern of Nitrogen in Organic Compounds

Forms 3 bonds and has 1 nonbonded electron pair.

Bonding Pattern of Oxygen in Organic Compounds

Forms 2 bonds and has 2 nonbonded electron pairs.

Bonding Pattern of Halogens (F, Cl, Br, I)

Forms 1 bond and has 3 nonbonded electron pairs.

Carbon-Oxygen Double Bond ($C=O$)

The most common multiple bond formed between a carbon atom and a heteroatom in organic chemistry.

Methanol ($CH_3OH$)

An organic alcohol containing four single bonds to carbon, two single bonds to oxygen, and two nonbonded electron pairs on oxygen.

Formaldehyde ($CH_2=O$)

An organic carbonyl compound containing four bonds to carbon, a carbon-oxygen double bond, and two lone pairs on oxygen.

Condensed Structure

A molecular representation where all atoms are written out, but two-electron bond lines and heteroatom lone pairs are generally omitted.

$CH_3$ Group (Methyl Group in Condensed Structures)

A structural unit representing a carbon atom bonded directly to three hydrogen atoms.

$CH_2$ Group (Methylene Group in Condensed Structures)

A structural unit representing a carbon atom bonded directly to two hydrogen atoms within a chain.

$CH$ Group

A structural unit in a condensed formula representing a carbon atom bonded to only one hydrogen atom.

Parentheses in Condensed Structures

Brackets used to simplify condensed formulas by grouping consecutive identical units such as $(CH_2)_2$ or identical branches such as $(CH_3)_2CH$.

Skeletal Structure

A molecular drawing method where bonds between carbon atoms are drawn as lines, carbon atoms and their attached hydrogens are omitted, and heteroatoms with their attached hydrogens are written explicitly.

Line Junction (Vertex) in a Skeletal Structure

A point where two or more bond lines intersect, representing a carbon atom with enough hydrogens to satisfy four total bonds.

Line End in a Skeletal Structure

The terminal point of a line that does not connect to another line or heteroatom, representing a methyl ($-CH_3$) group.

Heteroatoms in Skeletal Structures

Non-carbon and non-hydrogen atoms that must always be drawn explicitly along with any hydrogen atoms directly bonded to them.

Cyclohexane

A six-carbon cycloalkane ($C_6H_{12}$) represented in skeletal structures by a simple six-sided polygon (hexagon).

Cyclopentanol

A cyclic alcohol consisting of a five-membered ring of carbon atoms attached to a hydroxyl group ($-OH$).

2,2-Dimethylbutane

A six-carbon branched alkane represented by the condensed formula $CH_3CH_2C(CH_3)_2CH_3$.

Functional Group

An atom or a group of atoms with characteristic chemical and physical properties, typically containing a heteroatom, a multiple bond, or both.

R Group

The letter abbreviation used in generalized organic formulas to represent the carbon and hydrogen backbone of a molecule.

Hydrocarbons

A class of organic compounds composed exclusively of carbon and hydrogen atoms.

Alkanes

Hydrocarbons having only carbon-carbon and carbon-hydrogen single bonds and containing no functional group.

Alkenes

Hydrocarbons that possess a carbon-carbon double bond ($C=C$) as their defining functional group.

Alkynes

Hydrocarbons that possess a carbon-carbon triple bond ($C \equiv C$) as their defining functional group.

Aromatic Compounds

Hydrocarbons that contain a benzene ring as their characteristic structural feature.

Benzene Ring

A planar six-membered ring containing three alternating double bonds, characteristic of aromatic hydrocarbons.

Alkyl Halides

Compounds containing a carbon-heteroatom single bond to a halogen, with the general formula $R-X$ (where $X = F, Cl, Br, I$).

Halo Group

The halogen functional group ($-X$) present in alkyl halides.

Alcohols

Organic compounds containing a hydroxyl group bonded to a carbon backbone, represented by the general formula $R-OH$.

Hydroxyl Group

The $-OH$ functional group consisting of an oxygen atom singly bonded to a hydrogen atom.

Ethers

Organic compounds in which an oxygen atom is singly bonded between two carbon groups, having the general structure $R-O-R$.

Alkoxy Group

The $-OR$ functional group consisting of an alkyl group bonded to an oxygen atom.

Amines

Organic compounds containing a nitrogen atom singly bonded to carbon or hydrogen, with general structures $R-NH_2$, $R_2NH$, or $R_3N$.

Amino Group

The $-NH_2$ functional group consisting of a nitrogen atom bonded to two hydrogen atoms.

Thiols

Organic compounds containing a sulfhydryl group bonded to a carbon backbone, with the general structure $R-SH$.

Sulfhydryl Group

The $-SH$ functional group consisting of a sulfur atom singly bonded to a hydrogen atom.

Carbonyl Group

A functional group consisting of a carbon atom doubly bonded to an oxygen atom ($C=O$).

Aldehydes

Carbonyl compounds containing at least one hydrogen atom directly bonded to the carbonyl carbon, represented as $R-CHO$.

Ketones

Carbonyl compounds in which the carbonyl carbon is bonded to two alkyl or aryl carbon groups, represented as $R-CO-R$.

Carboxylic Acids

Compounds containing a carbonyl carbon bonded directly to a hydroxyl group, having the general formula $R-COOH$.

Carboxyl Group

The $-COOH$ functional group containing a carbonyl group and a hydroxyl group attached to the same carbon atom.

Esters

Carbonyl compounds containing an alkoxy group ($-OR$) bonded directly to the carbonyl carbon, represented as $R-COOR$.

Amides

Carbonyl compounds containing a nitrogen atom directly bonded to the carbonyl carbon.

Amine vs. Amide Distinction

An amine contains a nitrogen atom bonded to carbon without an adjacent carbonyl group, whereas an amide features a nitrogen atom directly bonded to a $C=O$ group.

Styrene

An organic compound consisting of a benzene ring bonded to a double-bonded alkene side chain, used as the starting material for synthesizing Styrofoam.

Styrofoam

A synthetic plastic polymer produced from the polymerization of styrene monomer units.

2-Propanol

A secondary alcohol with the formula $CH_3CH(OH)CH_3$, used as a disinfectant in rubbing alcohol.

Putrescine

A diamine compound with the formula $H_2NCH_2CH_2CH_2CH_2NH_2$ that produces the putrid odor of rotting fish.

Ibuprofen

An anti-inflammatory drug containing a benzene ring, a branched alkyl group, and a carboxylic acid functional group.

Fentanyl

A synthetic narcotic pain reliever possessing benzene rings, an amine group, and an amide functional group.

Tamiflu

An antiviral pharmaceutical drug featuring an alkene, an ether, an amide, an amine, and an ester group.

Isoprene

A five-carbon diene emitted by plants containing two carbon-carbon double bonds.

Tartaric Acid

A dicarboxylic acid and diol obtained from grapes containing two carboxyl groups and two hydroxyl groups.

Saturated Alkanes

Acyclic alkanes that possess the maximum possible number of hydrogen atoms per carbon atom, having only single bonds.

General Formula for Acyclic Alkanes

$C_n H_{2n+2}$, where $n$ corresponds to the number of carbon atoms.

Cycloalkanes

Hydrocarbons that contain carbon atoms joined into one or more closed rings.

General Formula for Cycloalkanes

$C_n H_{2n}$, reflecting the reduction of two hydrogen atoms compared to open-chain alkanes.

Alkane Suffix

The suffix "-ane" added to the parent name to designate saturated single-bonded hydrocarbons.

Straight-Chain Alkanes

Alkanes whose carbon atoms are linked in an continuous chain without any branching.

Molecular Formula of Methane

$CH_4$, representing a one-carbon alkane.