Final answer:The benzylic carbons are the carbon atoms directly attached to the benzene ring in each structure.Explanation:The benzylic carbons are the carbon atoms directly attached to the benzene ring.For the given structures:a. 3-ethyl-4-methyl-3-heptene: The benzylic carbon is the carbon attached to the ethyl group, which is at position 3 of the carbon chain.b. 3,3-diethyl-1-pentyne: The benzylic carbons are the two carbon atoms directly attached to the ethyl groups at positions 3 and 3 of the carbon chain.The complete question is:  Identify the benzylic carbons in each of the structures. Place an asterisk "*" next to each benzylic carbon in each structure....

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