For example, a typical problem might ask: "Synthesize butanoic acid starting from 1-bromopropane."

Starting from 1,2-ethanediol (HO-CH₂-CH₂-OH), produce 2-hydroxyethanal (OH-CH₂-CHO). Challenge: You cannot oxidize a diol directly—it will over-oxidize to a dicarboxylic acid.

This article provides a comprehensive walkthrough. We will not simply list final answers; we will dissect the logic, explore common pitfalls, and provide you with the tools to solve any synthesis problem independently. Chemsheets is a UK-based educational resource provider (written by Mr. K. N. French) that produces high-quality worksheets for A-Level Chemistry (specifically AQA, Edexcel, and OCR syllabi). Their "Organic Synthesis" problem sets are multi-step puzzles where you are given a starting reactant and a target product. You must fill in the missing reagents, conditions, and intermediate structures.

Master the logic, memorize the reagents, and respect the conditions. Then, the “answers” will become obvious—and you won’t need to search for them online ever again. Struggling with a specific Chemsheets synthesis problem not covered here? Post the full question in the comments (with the sheet number), and we will work through the mechanism together.

Among the most challenging resources are the Chemsheets Organic Synthesis Problems . These worksheets are famous (or infamous) for pushing students beyond simple recall into genuine problem-solving. If you have been searching for , you are likely not just looking for a solution key—you are looking to understand the methodology behind the answers.

Benzene (C₆H₆) → Methylbenzene (toluene) → 4-nitrotoluene. The nitro group (–NO₂) must be para to the methyl group.

The answer key to one specific worksheet is static. Real chemistry is dynamic.

Order of reactions matters. The methyl group is a 2,4-directing (activating) group. The nitro group is a 3-directing (deactivating) group. If you nitrate first, you get nitrobenzene. Then Friedel-Crafts alkylation fails because nitrobenzene is too deactivated. So you must alkylate first .