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(C) $1$. Identify the principal functional group: The compound contains a benzene ring with $-OH$,$-CHO$,and $-CH_3$ groups. According to $IUPAC$ prio

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$3-$Hydroxy$-5-$methylbenzaldehyde

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(C) $1$. Identify the principal functional group: The compound contains a benzene ring with $-OH$,$-CHO$,and $-CH_3$ groups. According to $IUPAC$ priority rules,the aldehyde $(-CHO)$ group has higher priority than the hydroxyl $(-OH)$ group. Therefore,the parent compound is benzaldehyde.$2$. Numbering the ring: The carbon atom attached to the $-CHO$ group is assigned position $1$. We then number the ring to give the lowest possible locants to the substituents. If we start from the $-CHO$ group as $1$,the $-OH$ group is at position $3$ and the $-CH_3$ group is at position $5$. Thus,the name is $3-$hydroxy$-5-$methylbenzaldehyde.

What is the $IUPAC$ name of the following compound?

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