(A) The reaction of phenol with $HNO_2$ (nitrous acid) at low temperature yields $p$-nitrosophenol as the major product $(A)$.Subsequently,$p$-nitroso

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(A) The reaction of phenol with $HNO_2$ (nitrous acid) at low temperature yields $p$-nitrosophenol as the major product $(A)$.Subsequently,$p$-nitrosophenol can be oxidized by $HNO_3$ to form $p$-nitrophenol.Therefore,the product $(A)$ formed in the first step is $p$-nitrosophenol.