1. One stereoisomer of 1,1,3,5,-tetramethylcyclohexane is 15 kJ/mol less stable than the other. Which one more stable and why? Explain.
2. Compound A (C4H10) gives 2 different monochlorides, treatment of which with potassium tert-butoxide in dimethyl sulfoxide gives the same alkene B (C4H8) as the only product. What are structures of A and B?