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(D) $1$. The reaction of $1-fluoro-2, 4-dinitrobenzene$ with hydrazine $(NH_2-NH_2)$ proceeds via nucleophilic aromatic substitution to form $2, 4-din

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$B$ is known as an oxime.

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(D) $1$. The reaction of $1-fluoro-2, 4-dinitrobenzene$ with hydrazine $(NH_2-NH_2)$ proceeds via nucleophilic aromatic substitution to form $2, 4-dinitrophenylhydrazine$ $(A)$. Thus,statement $A$ is correct.$2$. The reaction of $2, 4-dinitrophenylhydrazine$ $(A)$ with $butanone$ in the presence of $H^+$ and heat is a condensation reaction (dehydration) that forms a hydrazone $(B)$. Thus,statement $B$ is correct.$3$. The product $B$ is a hydrazone,not an oxime (oximes are formed from hydroxylamine,$NH_2OH$). Thus,statement $D$ is incorrect.$4$. The hydrazone formed $(B)$ contains a $C=N$ bond with different groups on the nitrogen and carbon atoms,allowing for geometrical isomerism ($syn$ and $anti$ forms). Thus,statement $C$ is correct.

The incorrect statement regarding the reaction shown below is:

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