Q.

Coupling of phenol with benzene diazonium salt yields 

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a

a mixture 1, 2 and 3

b

m-hydroxy derivative of salt 

c

p-hydroxy derivative of salt 

d

o-hydroxy derivative of salt

answer is B.

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Detailed Solution

  • Phenol couples with benzene diazonium salt to form p-hydroxy derivatives of salt. This reaction takes place in a basic reaction medium and is also a type of coupling reaction. This p-hydroxy derivative of salt formed is also known as an orange dye. Hence, the coupling of phenol with benzene diazonium salt yields p-hydroxy derivatives of salt. 
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