In a laboratory are found two different compounds: A (melting point 24.7°C) and B (melting point 21°C). Both compounds have the same molecular formula (C₇H₁₄O), and both can be resolved into enantiomers. Both compounds give off a gas when treated with NaH. Treatment of either A or B with tosyl chloride in pyridine yields a tosylate ester, and treatment of either tosylate with potassium tert-butoxide gives a mixture of the same two alkenes, C and D. However, reaction of the tosylate of A with potassium tert-butoxide to give these alkenes is noticeably slower than the corresponding reaction of the tosylate of B. When either optically active A or optically active B is subjected to the same treatment, both alkene products C and D are optically active. Treatment of either C or D with H₂ over a catalyst yields methylcyclohexane. Identify all unknown compounds and explain your reasoning.