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Catalytic Hydrogenation

Give the stat...

Question

Give the statement that is true regarding the following reaction that generates two products.

A

The minor product that is formed faster is less stable than the major product

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B

The major product that is formed faster is more stable than the minor product

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C

The minor product is formed faster and is less stable than the minor product

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D

The major product is formed faster and is less stable than the minor product

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Solution

The correct option is D The major product is formed faster and is less stable than the minor product
The statement D, "The major product is formed faster and is less stable than the minor product" is true.
When bulky base is used, Hoffman product (less substituted alkene) will be formed during dehydrobromination. It is due to kinetic control. It is rapidly formed and less stable than thermodynamically controlled product, which is saytzeff product or more substituted alkene.

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Q. Nitrobenzene is formed as the major product along with a minor product in the reaction of benzene with a hot mixture of nitric acid and sulphuric acid. The minor product consists of carbon 42.86%, hydrogen 2.40%,nitrogen 16.67%, and oxygen 38.07%.
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(I) The major product formed in the above reaction is:

(II) This reaction is an example of Fridel-Crafts alkylation.
(III) The carbocation formed

(C H_{3})_{3} C^{+}

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Consider figure and mark the correct option.

(a) Activation energy of forward reaction is $E_{1}$ + $E_{2}$ and product is less stable than reactant

(b) Activation energy of forward reaction is $E_{1}$ + $E_{2}$ and product is more stable than reactant

(c) Activation energy of both forward and backward reaction is $E_{1}$ + $E_{2}$ and reactant is more stable than product

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