Draw structures corresponding to each of the given names.
1. 12-crown-4
2. diethyl ether
3. 2,2,2-trichloroethanal (chloral)
4. trans-3-isopropylcyclohexanecarbaldehyde
5. 5,5-dimethyl-1,3-cyclohexanedione (dimedone)
6. 2-cyclohexenone.