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Solution

Solution Steps

Step 1: Understanding UV Absorption in Conjugated Systems

UV absorption is related to the presence of conjugated pi systems in a molecule. More extensive conjugation (longer chains of alternating single and double bonds) leads to absorption at longer wavelengths (lower energies).

Step 2: Identifying Conjugated Systems

We need to identify which molecules have the longest conjugated pi system.

(a) Has three conjugated double bonds.
(b) Has three conjugated double bonds.
(c) Has two conjugated double bonds.
(d) Has two conjugated double bonds.
(e) Has one double bond, so no conjugation.

Step 3: Determining the Longest Wavelength Absorption

Between (a) and (b), both have the same number of conjugated double bonds, but (b) has an additional alkyl substituent on the conjugated chain. Alkyl substitution increases the wavelength of maximum absorption. Therefore, (b) absorbs at the longest wavelength.

Final Answer: b

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