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An opportunity to earn college level credit Advanced placement chemistry is a course and examination that is offered by the college board which is a part of Advanced Placement Program to give American and Canadian high school students an opportunity that demonstrates their abilities and earn them a college level credit. The course is highly motivated towards students who are interested in chemical and physical sciences including biological sciences. Study of molecular structures in three dimensional space In the study of organic chemistry, very often we come across different organic compounds which have same molecular formula. Like dimethyl ether and ethyl alcohol have same molecular formula, but their properties are quite different. Such compounds are called as isomers and the phenomenon is referred as isomerism.