Chemsheets Organic Synthesis Problems Answers Official

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

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 . Chemsheets Organic Synthesis Problems Answers

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. The methyl group is a 2,4-directing (activating) group

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. and intermediate structures. Starting from 1

Trying to add oxygen directly to the double bond with KMnO₄ (which gives diols or cleaves the bond).

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

The classic carbon-chain lengthening reaction is via a nitrile (–CN).