The bicyclic alkene P can be prepared by thermal electrocyclic ring closure from cyclodecadiene Q or by photochemical electrocyclic ring closure from cyclodecadiene R. Draw the structures of Q and R, and indicate the stereochemistry of the process by which each reaction occurs.

Please show all arrow pushing mechanisais. Thank you!

Draw TWO tautomers of cyclohexa-2,4-dienone A. Place arrows between the three structures and indicate which is the most thermodynamically stable isomeric form and why. A

Draw the structure of the expected organic product(s) formed in the following reactions including correct stereochemistry. If the product is racemic write both isomers or write racemic. Assume all reagents listed are present in excess unless otherwise noted. If no reaction occurs, state 'No Reaction'

Name the alkenes below. Use ONLY E/Z designators to indicate stereochemistry. H3C H Ja H CH₂-C H CH3 CH₂CH3

Take 1-methylcyclohexene as the alkene and treat it with the reagent.

Ethers can be prepared by reaction of an alkoxide or phenoxide ion with a primary alkyl halide. Draw the structure of the expected organic product of the reaction of iodomethane with the following alkoxide ion: CH3 H3C O Na You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Do not include counter-ions, e.g., Na", I, in your answer. орy вste ChemDoodle

Calculate the units of unsaturation of C6H7NO. And draw out the structure.

Radical bromination of cyclohexene using NBS gives 3-bromo-1-cyclohexene. Draw the allylic radical intermediate formed during this reaction, showing both resonance structures

The deuterated ethanol shown can be converted to an alkyl halide via a mesylate intermediate. Complete the mechanism, draw the final product (with nonbonding electrons) and select the correct absolute stereochemistry of the starting material and the final product.