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(D) The reaction of phenol with concentrated $H_2SO_4$ at $373 \ K$ yields phenol-$2,4$-disulphonic acid (Product $A$).Chemical formula of Product $A$

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$14$

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(D) The reaction of phenol with concentrated $H_2SO_4$ at $373 \ K$ yields phenol-$2,4$-disulphonic acid (Product $A$).Chemical formula of Product $A$ $(C_6H_6O_7S_2)$: It contains $7$ oxygen atoms.Reaction of phenol-$2,4$-disulphonic acid with concentrated $HNO_3$ yields $2,4,6$-trinitrophenol (Picric acid) (Product $B$).Chemical formula of Product $B$ $(C_6H_3N_3O_7)$: It contains $7$ oxygen atoms.Total sum of oxygen atoms = $7$ (in $A$) + $7$ (in $B$) = $14$.

Consider the given chemical reaction sequence:
(Image provided)
Total sum of oxygen atoms in Product $A$ and Product $B$ are .........

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Consider the given chemical reaction sequence:(Image provided)Total sum of oxygen atoms in Product $A$ and Product $B$ are .........