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Author Question: Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the ... (Read 287 times)

SAVANNAHHOOPER23

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on: Aug 23, 2018
Which of 1,3-cyclohexadiene and 1,4-cyclohexadiene has the greatest heat of hydrogenation (i.e., the most exothermic reaction with H2 in the presence of a catalyst). Provide a brief explanation for your choice ?

Question 2

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?


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huda

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Reply #1 on: Aug 23, 2018
Answer to Question 1

1,4-Cyclohexadiene has a greater heat of hydrogenation. This is because 1,3-cyclohexadiene is stabilized by conjugation of the two pi bonds.

Answer to Question 2

1,3-Cyclohexadiene, in which the two pi-bonds are conjugated, absorbs at a higher wavelength than 1,4-cyclohexadiene.


SAVANNAHHOOPER23

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Reply 2 on: Aug 23, 2018
Thanks for the timely response, appreciate it

dawsa925

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Reply 3 on: Yesterday
Gracias!

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