Isomer answers

You should have found the following six isomers:

Be careful to check your answers carefully. Students often get "extra" isomers, but these turn out to be twisted or flipped over versions of the above. The two dimensional nature of the paper often makes these twisted versions appear different. However, the actual molecules are three dimensional. It helps if you can make models of each of your isomers as it is much easier to see when the molecules are the same. For example, the following are all versions of butan-2-ol:

Try to write the longest carbon chain of the molecule in a straight line - this should eliminate some of the twisting errors!