The most important laboratory synthesis of phenols is by hydrolysis of

Options

A. arenediazonium salts
B. aryl halides
C. Grignard reagents
D. aromatic amines

Answer

A

Explanation

`Ar-NH_(2)overset(HONO)rarrAr-N_(2)^(+) underset(Cu^(2+),H_(2)O)overset(Cu_(2)O)rarr Ar -OH`

This method is highly versatile , and the conditions required for the diazotization step and the hydrolysis step are mild.This means that other groups present on the ring are unlikely to be affected.
Through hydrolysis of the diazonium salt we can convert benzene to phenol:
`PhHoverset(HNO_(3)//H_(2)SO_(4))rarrPhNO_(2) underset(2.NaOH)overset(1.Sn//HCl)rarrPhNH_(2)underset(0-5^(@)C)overset(NaNO_(2)//aq.HCl)rarr PhN_(2)^(+)Cl underset(Delta)overset(H_(2)O)rarrPhOH`