Which of the following is not an azo compound | vedclass

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(C) An azo compound contains the functional group $R-N=N-R'$,where $R$ and $R'$ are aryl groups.$A$. Methyl orange is an azo dye containing the $-N=N-

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Phenolphthalein

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(C) An azo compound contains the functional group $R-N=N-R'$,where $R$ and $R'$ are aryl groups.$A$. Methyl orange is an azo dye containing the $-N=N-$ linkage.$B$. Benzenediazonium chloride contains the $-N^+=N \ Cl^-$ group,which is a diazonium salt,not an azo compound.$C$. Phenolphthalein is a phthalein dye,not an azo compound.$D$. $p$-Hydroxyazobenzene contains the $-N=N-$ linkage.Since both $B$ and $C$ are not azo compounds,and the question asks for the most appropriate answer in the context of common chemistry curriculum,$C$ is a classic example of a non-azo indicator dye,while $B$ is a diazonium salt. However,strictly speaking,neither $B$ nor $C$ are azo compounds. Given the options,$C$ is the most distinct non-azo compound.

Which of the following is not an azo compound?

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