Question:
Which type of transitions are responsible for the R-band?
Which type of transitions are responsible for the R-band?
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R-band = $n \rightarrow \pi^$ transition (especially in carbonyls).
Updated On: May 22, 2025
- $\pi \rightarrow \pi^$
- $n \rightarrow \pi^$
- $\sigma \rightarrow \sigma^$
- $n \rightarrow \sigma^$
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The Correct Option is B
Solution and Explanation
The R-band (or n to $\pi^$ transition) arises when a non-bonding electron is excited to an antibonding $\pi^$ orbital. It is commonly observed in carbonyl-containing compounds and is characteristic of UV-visible spectra.
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