Circle ALL of the following which would absorb in the UV region.mNow indicate which ONE would absorb at the longest wavelength.

Answered: Circle ALL of the following which would…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Concept explainers

Question

Circle ALL of the following which would absorb in the UV region.
m
Now indicate which ONE would absorb at the longest wavelength.

Expert Solution

Step 1

To find out which molecule would absorb in the UV region, we need to know which wavelength of light is being absorbed.

We have to calculate $λ_{m a x}$ for each structure with the help of Woodward rules for conjugated alkenes.

The rules are given below:

For homo-annular dienes, the base value will be 253 nm.
For hetero-annular dienes, the base value will be 215 nm.
For butadiene system or cyclic conjugated diene, the base value will be 217 nm.
Between homo-annular and hetero-annular, the homo-annular structure will have the preference.
For every alkyl substituent, we have to add 5 nm.
For every exocyclic double bond, we need to add 5 nm.
For every double bond extending conjugation, we have to add 30 nm.

We will use these rules to evaluate $λ_{m a x}$ for each given molecule.

The UV range is 100 - 400 nm. Whenever the value of $λ_{m a x}$ is in between this range, we will say that the molecule will absorb in the UV range.

Step by step

Solved in 2 steps with 6 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions