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Quizzes > High School Quizzes > Science

Ace Your IUPAC Naming Practice Quiz

Master chemical nomenclature with an engaging test

Difficulty: Moderate
Grade: Grade 10
Study OutcomesCheat Sheet
Colorful paper art promoting IUPAC Naming Showdown quiz for chemistry students.

What is the IUPAC name for CH4?
Ethane
Methane
Propane
Butane
CH4 is the simplest alkane and consists of one carbon atom bonded to four hydrogens. Its IUPAC name is methane.
What is the IUPAC name for C2H6?
Methane
Ethane
Butane
Propane
C2H6 contains two carbon atoms, making it the simplest two”carbon alkane. The proper IUPAC name for it is ethane.
Which functional group does the suffix -ol represent in IUPAC nomenclature?
Ester group
Ketone group
Carboxylic acid group
Alcohol group
The suffix -ol is used to indicate the presence of a hydroxyl (alcohol) group. Alcohol compounds have an -OH group attached to a carbon chain.
What is the correct IUPAC name for C3H8?
Butane
Allene
Propane
Propene
C3H8 represents a three”carbon alkane with only single bonds. Its IUPAC name is propane.
What is the primary rule for numbering the carbon chain in IUPAC naming?
Number from the end with the highest alkyl group
Number the chain from the end nearest a substituent
Number from the longest chain regardless of substituents
Always number from left to right
The main rule in IUPAC nomenclature is to choose a numbering that gives substituents the lowest possible locant numbers. This minimizes ambiguity and conforms to standard naming conventions.
What is the IUPAC name for CH3CH2CH2OH?
2-Propanol
Propan-2-ol
1-Propanol
Methanol
The molecule CH3CH2CH2OH has a three-carbon chain with a terminal hydroxyl group. Hence, the correct IUPAC name is 1-Propanol.
How should you name a compound with a double bond following IUPAC rules?
Use the suffix -ol for double bonds
Replace the -ane suffix with -ene, indicating a double bond
Add the prefix 'di-' before the alkane name
Replace the terminal -e with -yne
When an alkane has a double bond, the -ane ending is replaced by -ene to signal the presence of unsaturation. This rule clearly distinguishes alkenes from alkanes.
In naming alkyne compounds, which suffix is used in IUPAC nomenclature?
ene
one
yne
anol
Alkyne compounds feature a carbon-carbon triple bond and are denoted by the suffix -yne in IUPAC nomenclature. This distinguishes them from alkanes and alkenes.
Which naming rule is applied when a compound has substituents on a cyclic structure?
Alphabetize substituents disregarding numbers
Use numbering that gives substituents the lowest possible numbers
Use the rule of highest atomic number first
Always start numbering at the position of the halogen
When naming cyclic compounds, the ring is numbered so that substituents receive the lowest set of locants. This minimizes ambiguity and complies with IUPAC standards.
For a compound with two identical substituents on a straight chain, what prefix is used?
Tetra-
Tri-
Di-
Mono-
The prefix 'di-' is used when two identical substituents are present on the parent chain. This systematic approach is an essential part of IUPAC nomenclature.
What is the correct IUPAC name for CH3CH(Br)CH3?
1-Bromo-2-propane
2-Bromo-2-methylpropane
1-Bromopropane
2-Bromopropane
In CH3CH(Br)CH3, the bromine substituent is attached to the middle carbon of a three-carbon chain. Numbering the chain to give the substituent the lowest possible number produces 2-Bromopropane.
When naming a compound with both a ketone and an alcohol group, which functional group has priority?
It depends on chain length
The ketone group
Both are equally prioritized
The alcohol group
IUPAC nomenclature assigns the suffix based on the highest priority functional group present. In compounds with both a ketone and an alcohol, the ketone group is given priority over the hydroxyl group.
What is the IUPAC name for CH3CH2COOH?
Propanoic acid
Butanoic acid
Propionic acid
Ethanoic acid
CH3CH2COOH is a three”carbon carboxylic acid. Using the root 'propane' and the suffix -oic acid, the correct IUPAC name is Propanoic acid.
What is the correct IUPAC name for CH3COCH3?
2-Propanol
Acetone
Propan-1-one
Propan-2-one
CH3COCH3 is a three-carbon ketone with its carbonyl group on the central carbon. The IUPAC name, Propan-2-one, clearly indicates the position of the ketone functional group.
When naming branched alkanes, what is the method for naming substituents attached to the main chain?
Number the substituents according to their atomic weights
Always name the substituents in alphabetical order regardless of chain length
Identify the longest continuous chain and then name the substituents as prefixes with their corresponding locants
Use Roman numerals for substituent positions
The correct approach in naming branched alkanes is to first identify the longest carbon chain and then designate the substituents as prefixes with their location numbers. This systematic method avoids ambiguity in complex molecules.
What is the correct IUPAC name for CH3CH(CH3)CH2CH2Br?
3-Bromo-1-methylbutane
1-Bromo-3-methylbutane
1-Bromo-2-methylbutane
3-Bromo-2-methylbutane
Numbering the carbon chain from the end nearest the bromine gives the substituent the lowest possible locant. Therefore, the compound is correctly named 1-Bromo-3-methylbutane.
What is the correct IUPAC name for CH3C(CH3)2CH2CH(Cl)CH3?
2,2-Dimethyl-4-chloropentane
4-Chloro-2,2-dimethylpentane
2-Chloro-4,4-dimethylpentane
4-Methyl-2,2-dichloropentane
The longest chain has five carbons with substituents at positions 2 and 4 when numbered to minimize locants. With chlorine at carbon 4 and two methyl groups at carbon 2, the correct name is 4-Chloro-2,2-dimethylpentane.
What is the correct IUPAC name for CH3C≡CCH(CH3)2?
4,4-Dimethyl-1-butyne
3,3-Dimethyl-1-butyne
4,4-Dimethyl-2-butyne
2,2-Dimethyl-1-butyne
The compound has a four-carbon chain with a triple bond starting at carbon 2 and two methyl groups on carbon 4. Following IUPAC rules, it is correctly named 4,4-Dimethyl-2-butyne.
What is the correct IUPAC name for HOCH2CH=CHCH3?
But-1-en-2-ol
3-Buten-1-ol
But-2-en-1-ol
2-Buten-1-ol
Since the hydroxyl group has higher priority than the alkene, numbering starts from the end nearest the -OH. This results in the double bond starting at carbon 2 and the -OH group at carbon 1, giving the name But-2-en-1-ol.
What is the correct IUPAC name for a benzene ring with a methyl group and a nitro group, where the methyl group is assigned position 1?
1-Methyl-3-nitrobenzene
1-Nitro-2-methylbenzene
1-Methyl-2-nitrobenzene
2-Methyl-1-nitrobenzene
In aromatic compounds, the substituent that comes first alphabetically is assigned the locant 1. Since 'methyl' precedes 'nitro', the compound is correctly named 1-Methyl-2-nitrobenzene.
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Study Outcomes

  1. Identify and apply IUPAC naming rules to a variety of organic compounds.
  2. Analyze molecular structures to determine the correct parent chain and substituents.
  3. Construct accurate IUPAC names for given organic molecules.
  4. Differentiate between isomers using established nomenclature conventions.
  5. Evaluate common naming challenges and derive systematic solutions.

IUPAC Naming Quiz: Practice & Review Cheat Sheet

  1. Master the Longest Chain Rule - Hunt down the longest continuous carbon chain in your molecule to nail the base name. Think of it like finding the main road through a city - everything else branches off that spine! Spot a seven‑carbon stretch and you've got heptane as your starting point. IUPAC Nomenclature Guide
  2. Apply the Lowest Number Rule - Number your chain from the end nearest the first substituent so you get the smallest possible set of locants. It's like giving out house numbers - start from the end where you get fewer digits! This simple trick keeps your names short, sweet, and unambiguous. IUPAC Nomenclature Guide
  3. Understand Functional Group Priorities - Learn the hierarchy of functional groups so you can identify the principal one that dictates your suffix and numbering. Carboxylic acids always outrank alcohols, which outrank ketones, and so on - like superheroes in a rank order! Choosing the right priority keeps your names valid and consistent. ACS Functional Group Priority Rules
  4. Use Prefixes for Multiple Identical Substituents - When the same group pops up more than once, slap on di‑, tri‑, tetra‑, etc., to show how many. For example, 2,3‑dimethylbutane tells you there are two methyl groups on carbons 2 and 3. This prefix party prevents you from writing repetitive names. UW Organic Nomenclature Rules
  5. Alphabetize Different Substituents - List different substituents in alphabetical order (ignore di‑, tri‑ prefixes), so ethyl comes before methyl. Picture a filing cabinet where "ethyl" files under E and "methyl" under M - no "twists" allowed! This rule keeps everyone on the same page when reading long names. UW Organic Nomenclature Rules
  6. Assign Stereochemistry with R/S Notation - Use Cahn‑Ingold‑Prelog priority rules to decide if a chiral center is R (rectus) or S (sinister). It's like ranking guests at a VIP party - highest priority substituent gets #1, and you trace the direction. This step tells the 3D story of your molecule! CIP Priority Rules
  7. Determine E/Z Configurations for Double Bonds - For alkenes, assign E (opposite sides) or Z (same side) based on the highest‑priority groups around the double bond. Imagine two VIPs deciding whether to stand together (Z) or apart (E)! This notation clears up any steering‑wheel confusion in your name. E/Z Notation Wiki
  8. Practice with Diverse Examples - Tackle a mix of simple and complex practice problems to cement your IUPAC naming skills. The more molecules you name, the more pattern‑spotting superpower you develop! Consistent practice also boosts your confidence for quizzes and exams. IUPAC Practice Problems
  9. Learn Common Functional Group Suffixes - Memorize key suffixes like - ol for alcohols, - al for aldehydes, - one for ketones, and - oic acid for carboxylic acids. Having this cheat sheet in your brain saves you time and brainpower during exams! It's like having a secret decoder ring for functional groups. IUPAC Organic Guide
  10. Stay Updated with IUPAC Guidelines - IUPAC rules evolve, so check official resources regularly to catch any updates or rule tweaks. Think of it as subscribing to the coolest chemistry newsletter - never miss out on the latest naming trends! Keeping current means you'll always speak the universal chemical language. IUPAC Organic Guide
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