(C) When phenol reacts with $NaNO_2$ and $HCl$ at $0-5^{\circ}C$,the electrophile $NO^+$ (nitrosonium ion) is generated. This electrophile attacks the

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(C) When phenol reacts with $NaNO_2$ and $HCl$ at $0-5^{\circ}C$,the electrophile $NO^+$ (nitrosonium ion) is generated. This electrophile attacks the electron-rich benzene ring of phenol,primarily at the para-position due to steric hindrance at the ortho-position. Thus,the major product formed is $4$-nitrosophenol.