Αποτελέσματα Αναζήτησης
one aromatic compound. OR Attempts to describe an electrophilic reaction and mechanism of one aliphatic OR one aromatic compound, with omissions/errors. There is an attempt at a logical structure with a line of reasoning. The information is in the most part relevant.
D. 1 All carbon–carbon bonds have the same length. 2 The enthalpy change of hydrogenation of. benzene is less exothermic than expected. 3 Bromine reacts with benzene less readily than with cyclohexene. 1, 2 and 3. Only 1 and 2.
Please refer to the marking instructions on page 5 of this mark scheme for guidance on how to mark this question. Level 3 (5–6 marks) Outlines the main steps of recrystallisation to produce a pure sample of 3-nitrobenzoic acid from the impure solid. AND. Calculates correct percentage yield of 3-nitrobenzoic acid. AND.
6 Οκτ 2015 · 6.1.1 Aromatic Compounds. There are two major classes of organic chemicals aliphatic : straight or branched chain organic substances aromatic or arene: includes one or more ring of six carbon atoms with delocalised bonding. Benzene’s Structure. The simplest arene is benzene.
11 Δεκ 2019 · Aromatic Compounds AS & A Level. Model Answers 1. Time allowed: 100 minutes. Score: /74. Percentage: /100. Grade Boundaries: A* > 73% 60% 47% 34% 21% Salicylic acid is a naturally occurring carboxylic acid, widely used in organic synthesis. OH. COOH. salicylic acid. (a) The flowchart below shows some reactions of salicylic acid.
Fully explain why each of the following heterocyclic aromatic compounds are aromatic. Use resonance theory to account for the fact that phenol (pKa 9.95) is a stronger acid than cyclohexanol (pKa 18). Draw the structure of each compound and arrange each in order of increasing acidity (from least acidic to most acidic).
Aromatic compounds serve as the basis for many drugs, antiseptics, explosives, solvents, and plastics (e.g., polyesters and polystyrene). The two simplest unsaturated compounds—ethylene (ethene) and acetylene (ethyne)— were once used as anesthetics and were introduced to the medical field in 1924.
