Review Organic Chemistry

1. A cyclic ketone which hasn't got branches and has a Pm=84g/mol contains  71.4% C and 9,5%H. Tell its empiric and its mollecular fórmula. Draw its geometric fórmula. 
2. A compound burns energically, boils at 60°C and solves into water. It doesn't carry electricity. Can it be organic?
3. Name:

1. Write the formula of 

• 2 ethyl 2 propen-al
• 2 propyl 3 chloro butanoic acid
• 3 flúoro 2 cyclopentenone