Naming Organic Compounds - Unbranched
Chemistry: Cambridge International GCSE Supplement, topic 11.2.2
Naming Organic Compounds - Unbranched
Organic compounds include alkanes, alkenes, alcohols, carboxylic acids. They are named by chain length & functional group position.
Alkanes - naming and drawing
- Chemistry names unbranched alkanes with the suffix "-ane".
- Alkanes contain only single bonds between carbon atoms.
- The first four unbranched alkanes are methane (1C), ethane (2C), propane (3C), and butane (4C).
- Draw straight chains of carbon with hydrogen atoms bonded to fill carbon's four bonds.
- Displayed formulae show all bonds; structural formulae use letters and dashes.
Alkenes - naming and drawing
- Chemistry names unbranched alkenes with the suffix "-ene" to show at least one C=C double bond.
- But-1-ene and but-2-ene each have four carbons but differ by the position of the double bond.
- Number carbons from the end nearest the double bond.
- Draw alkenes showing the double bond location clearly in displayed and structural formulae.
Alcohols - naming and drawing
- Chemistry names unbranched alcohols with the suffix "-ol"
- Number the carbon chain so the -OH group has the lowest possible number.
- Examples include propan-1-ol, propan-2-ol, butan-1-ol, and butan-2-ol.
- Draw the -OH group attached to the correct carbon.
- Display formulae show the hydroxyl group clearly; structural formulae indicate the -OH position using numbers.
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Carboxylic acids - naming and drawing
- Chemistry names unbranched carboxylic acids with the suffix "-oic acid."
- Carboxylic acids contain the -COOH group at carbon 1.
- Examples with up to four carbons: methanoic acid, ethanoic acid, propanoic acid, and butanoic acid.
- Draw the -COOH group at the end of the carbon chain.
Summary and practice
- Chemistry uses specific suffixes to name unbranched organic compounds: -ane -ene -ol -oic acid
- Number carbon atoms from the end, giving functional groups the lowest number.
- Practice drawing both structural and displayed formulae for all types covered.
- Naming skills help understand organic compound properties and reactions.
Test yourself on Naming Organic Compounds - Unbranched
Which characteristic defines an alkene?