When piperidine undergoes the indicated series of reactions, 1,4-pentadiene is obtained as the product. When the four different methyl-substituted piperidines undergo the same series of reactions, each forms a different diene: 1,5-hexadiene, 1,4-pentadiene, 2-methyl-1,4 pentadiene, and 3-methyl-1,4-pentadiene. Which methyl-substituted piperidine yields which diene?

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1. excess CH3l/K2CO3 2. Ag2O, H20 3. A 1. excess CH3l/K2CO3 2. Ag20, H20 3. A CH3 piperidine