Question

JEE MAINS CHEMISTRY QUESTION SEPTEMBER 2020

Answer 1

Explanation:

To Find -

• Which of the following major product can be obtained from Gabriel phthalimide synthesis ?

Solution -

When a phthalimide is treated with alcoholic KOH then it forms potassium phthalimide (salt). Then, heating potassium phthalimide with alkyl halide it forms N-alkyl phthalimide. Then, treating N-alkyl phthalimide with aqueous NaOH it forms

sodium phthalate and 1° amine is produced.

Process -

( Refer to the attachment. )

Note -

1. This method produces only 1° Amine.
2. This method isn't used for the preparation of aromatic primary amine because aryl halide do not undergo Nucleophillic substitution with the anion formed by phthalimide.

1. Here, Option 4 is 3° Amine and This synthesis produces only 1° Amine. So, Option 4 is wrong
2. Option 3 is 2° Amine. So, Option 3 is also wrong.
3. Option 2 is 1° Amine but it's aromatic primary amine. So, Option 2 is also wrong.
4. Option 1 is 1° Amine. So, Option 1 is correct.

Hence,

CH2=CH-NH2 is the major product can be obtained from Gabriel phthalimide synthesis.

Therefore,

Option 1 is correct.

Answer 2

Answer:

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