SCH4U COMPREHENSIVE ASSESSMENT
2026 FULL ANSWERS GRADED A+
● Naming Alcohols. Answer: One OH group: number parent chain
closest to -OH group, give suffix "-al".
More than one -OH group: number parent chain closest to -OH group,
give suffix "-diol", "-triol", "-tetra" and state where each is.
● Properties of alcohols. Answer: - mix well with water since they're
polar molecules, producing neutral solutions
- evaporate easily
- useful solvents; many organic substances dissolve in them
- high boiling points
● Reactions of Alcohols Answer: 1. Dehydration: Alcohols --> Alkenes.
Water is lost as two compounds bond together.
● What is a phenol? Answer: An -OH group attached to a benzene.
● Aldehyde vs. Ketones Answer: BOTH are a class of organic
compound that contain a carbonyl functional group (-C=O)
, ALDEHYDES have a hydrogen atom attached to the carbonyl carbon.
KETONES have two hydrocarbon groups attached to the carbonyl
carbon.
● Naming Aldehydes Answer: *same rules when naming alkanes
- Number parent chain closest to carbonyl group, add suffix "-al" to
parent chain
● Naming Ketones Answer: - Number parent chain closest to carbonyl
group, add suffix "-one" to parent chain
● Properties of Aldehydes and Ketones Answer: - Polar molecules
- Boiling points > alkanes, ethers < Alcohols of same size
- can't form strong attractions to each other since there's no hydrogen
atoms bound to the carbonyl oxygen, but can form hydrogen bonds with
water molecules
- Small molecules are soluble, but as hydrocarbon tails get longer, they
interfere with hydrogen bonding and become increasingly insoluble
● Reactions of Aldehydes and Ketones. Answer: 1) Synthesis:
synthesized from the oxidation of alcohols, H-atom is removed from the
-OH group and the C forms a double-bond with the O, creating a
carbonyl group. (under acidic conditions, needs oxidizing agent)
2026 FULL ANSWERS GRADED A+
● Naming Alcohols. Answer: One OH group: number parent chain
closest to -OH group, give suffix "-al".
More than one -OH group: number parent chain closest to -OH group,
give suffix "-diol", "-triol", "-tetra" and state where each is.
● Properties of alcohols. Answer: - mix well with water since they're
polar molecules, producing neutral solutions
- evaporate easily
- useful solvents; many organic substances dissolve in them
- high boiling points
● Reactions of Alcohols Answer: 1. Dehydration: Alcohols --> Alkenes.
Water is lost as two compounds bond together.
● What is a phenol? Answer: An -OH group attached to a benzene.
● Aldehyde vs. Ketones Answer: BOTH are a class of organic
compound that contain a carbonyl functional group (-C=O)
, ALDEHYDES have a hydrogen atom attached to the carbonyl carbon.
KETONES have two hydrocarbon groups attached to the carbonyl
carbon.
● Naming Aldehydes Answer: *same rules when naming alkanes
- Number parent chain closest to carbonyl group, add suffix "-al" to
parent chain
● Naming Ketones Answer: - Number parent chain closest to carbonyl
group, add suffix "-one" to parent chain
● Properties of Aldehydes and Ketones Answer: - Polar molecules
- Boiling points > alkanes, ethers < Alcohols of same size
- can't form strong attractions to each other since there's no hydrogen
atoms bound to the carbonyl oxygen, but can form hydrogen bonds with
water molecules
- Small molecules are soluble, but as hydrocarbon tails get longer, they
interfere with hydrogen bonding and become increasingly insoluble
● Reactions of Aldehydes and Ketones. Answer: 1) Synthesis:
synthesized from the oxidation of alcohols, H-atom is removed from the
-OH group and the C forms a double-bond with the O, creating a
carbonyl group. (under acidic conditions, needs oxidizing agent)
