The reaction of 1, 3-butadiene with HCI produces two addition products. (See bel

Question

The reaction of 1, 3-butadiene with HCI produces two addition products. (See below) The relative amounts of the products that form is strongly temperature dependent. Here are the results: At 0 degree C, the following product composition is observed: product I (71%), product II (29%). At 42 degree C, the following product composition is observed: product I (15%), product II (85%). ANSWER THE FOLLOWING QUESTION: Why does the addition product II predominate at the higher temperature (42 degree C)? Select one: A. Product II is less statically hindered, so it predominates. B. At higher temperature, the reaction is equilibrium controlled: product II is more stable than product I, so product II predominates. C. At higher temperature, the reaction is kinetically controlled: product II forms faster, so product II predominates. D. Product II predominates at higher temperature because it has more p electron delocalization than product I. Which of the following dines is most stable (has lowest energy)?

Explanation / Answer

Answer:-B

at higher temperatures reaction is equilibrium controlled so product II being more stable is major product.

Electrophilic addition in conjugated diene gives two types of addition products:-

A)1,2-addition product:- it is less stable product and kineticaly controlled so it predominantly formed at lower temperature.

Here product i

B) 1,4-addition product:- it is more stable and thermodynamically controlled and predominantly formed at higher temperatures. Here product ii

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