
Which of the following compounds react with and at to give alcohol/phenol?
A.
B.
C.
D.
Answer
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Hint: The reagent and used to distinguish primary, secondary and tertiary amines. Only primary aliphatic amines react with and at . The product of the reaction is alcohol.
Complete Step by step answer: The reagent given to us is and and the reaction condition is . Only primary aliphatic amines react with and at and give alcohol as the product.
The amine given in option A is . Its structure is as follows:
It is aromatic amine so it will not give phenol after reacting with in at .
Thus, option (A) is incorrect.
The amine given in option B is . Its structure is as follows:
It is a primary aliphatic amine so it will give alcohol after reacting with in at .
So, option (B) is correct.
The amine given in option C is . Its structure is as follows:
It is secondary aliphatic amine so it will not give alcohol after reacting with in at .
Thus, option (C) is incorrect.
The amine given in option D is . Its structure is as follows:
It is aromatic secondary amine so it will not give phenol after reacting with in at .
Thus, option (D) is incorrect.
Hence, option (B) is the correct answer.
Note: Aliphatic primary amines react with in at and undergo diazotization to form alkane diazonium salt, which however being unstable decomposes to form a mixture of alcohols, alkene with the liberation of gas. Secondary amines react with in to form N-nitrosamines.
Complete Step by step answer: The reagent given to us is
The amine given in option A is

It is aromatic amine so it will not give phenol after reacting with
Thus, option (A)
The amine given in option B is

It is a primary aliphatic amine so it will give alcohol after reacting with
So, option (B)
The amine given in option C is

It is secondary aliphatic amine so it will not give alcohol after reacting with
Thus, option (C)
The amine given in option D is

It is aromatic secondary amine so it will not give phenol after reacting with
Thus, option (D)
Hence, option (B)
Note: Aliphatic primary amines react with
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