Question

OH

H₂O

Warm

X

'X' in the above conversion is

Answer 1

​$C_6 ​H_5 ​NH_2$  gives benzene diazonium chloride (X) upon reaction with $NaNO_2$

​ and $HCl$ . 

The formed benzene diazonium chloride (X) gives phenol (Y) in the presence of water.