Chemistry A-Level |143 Questions| With Correct Answers.

What is the oxidation reaction for primary alcohols? use e.g. ethanol {Ans: The oxidation is carried out using a chemical called an oxidising agent. A common oxidising agent is potassium dichromate with dilute sulfuric acid. It is called acidified potassium dichromate. (It has an orange colour) [O] --> 1 molecule of oxidising agent [O] --> K2Cr2O7 / H+ Producing ethanal: (aldehydes) -Needs 1 molecule of oxidising agent -The dichromate (VI) ion which is orange turns into the chromium (III) ion which is green. -Need to quickly remove the aldehyde before it oxidises again. Producing ethanoic acid: (carboxylic acid) -Requires 2 molecules of oxidising agent -When aldehydes are oxidised, they make a carboxylic acid. -When making carboxylic acids, you want to make sure that all of the aldehydes produced is then oxidised therefore you use an excess of oxidising agent. You can also use concentrated sulfuric acid, instead of dilute sulfuric acid.}What are unsaturated hydrocarbons? {Ans: hydrocarbons that contain double or triple bonds between carbon atoms}Identify the shape of p and s orbitals: {Ans: }Question: Which compound is not formed by reacting 3-bromo-3-methylhexane with warm, ethanolic potassium hydroxide? A —> 2-ethylpent-1-ene B —> 3-methylhex-1-ene C —> 3-methylhex-2-ene D