Discussion
Assertion (A): Assertion: Extending conjugation moves an absorption band to longer wavelength.
Reason (R): Reason: Delocalisation narrows the gap between the frontier orbitals.
Select the correct answer from the options below.
Answer: C
Both are true and the second is the mechanism: spreading electrons over more atoms raises the highest occupied orbital and lowers the lowest unoccupied one, so less energy suffices and the wavelength lengthens. The intensity rises too, which is a separate consequence of the same delocalisation. One structural change moving a band on both axes is the general pattern for conjugated systems.
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