An introduction to organic chemistry: describe question

Isomerism is a key concept in organic chemistry. Explain the meaning of isomerism and describe the different types that can occur. In your answer, you must:

• define structural isomerism and stereoisomerism, explaining the difference between them
• state the three categories of structural isomerism and give an example of each from compounds of molecular formula $\ce{C4H10O}$
• explain the conditions required for geometrical (cis/trans) isomerism and optical isomerism, and provide one example of each type.