Oxidation of food 4 and isomerism

Question 1

What is the purpose of antioxidants in foods

How do they work

Answer 1

• reduce the oxidation of chemicals in food and extend shelf life
• Some react with oxygen in preference to foodstuff and others prevent the formation of soapy-tasting peroxides

Question 2

what is an isomer

Answer 2

molecules with the same molecular formula, but different structural formula

Question 3

What types of molecuels can exhibit some type of isomerism

Answer 3

esters, aldehydes, ketones, alcohols and carboxylic acids

Question 4

Describe chain isomerism

Answer 4

in chain isomerism the atoms are arranged in a completely different oreder which results in branches

Question 5

Describe position isomersim

Answer 5

on position isomerism the basic carbon skeleton remains unchanged but functional groups can be moved

Question 6

what cannot have positional isomers and why

Answer 6

aldehydes and carboxylic acids can’t have positional isomers becuase the functional group must always be on the end carbon

Question 7

Describe functional group isomerism

Answer 7

functional group isomers contain dofferent functional groups - that is to say they belong to differnet families of compounds (different homologous series) - but have the same molecular formula