IUPAC Nomenclatures

$ \text { The IUPAC names of } $

are respectively

2-nitro-1-phenyl-butane

1-ethyl-1-methyl-2-propylcyclohexane

$ \text { The correct IUPAC name of } $

The correct IUPAC name of mesityl oxide and oxalic acid are

4-methylpent-3-en-2-one and ethanedioic acid.

The correct order of decreasing priority of functional group is,

Acyl chloride $>$ Amide $>$ Aldehyde $>$ Alcohol

$ -\mathrm{COCl}>-\mathrm{CONH}_2>-\mathrm{CHO}>-\mathrm{OH} $

$ \text { The correct IUPAC name of } $

$ \text { 7-bromo-5-ethyl-2 methyl dec-5-en-4-ol } $

The IUPAC name of the given compound i.e.,

The priority order for the given functionalities in $-\mathrm{CN}>-\mathrm{OH}>-\mathrm{Br}$.

$\therefore$ The numbering will be done from $-$CN and in such a way that the groups get lowest number possible.

Hence, the IUPAC name will be 2-bromo-3-hydroxy benzonitrile.

$-$CHO group represent aldehyde group and denoted as ‘al’.

Branched chain is $-$CH$_3$ which present on 2 carbon position. Principle chain containing 4 carbon with aldehyde group.

IUPAC name-2 methyl butanal.

Diacetone alcohol is an organic compound with the formula $\mathrm{CH}_3 \mathrm{C}(\mathrm{O}) \mathrm{CH}_2 \mathrm{C}(\mathrm{OH})\left(\mathrm{CH}_3\right)_2$ called DAA. It is colourless liquid and commonly used in synthetic intermediate and as solvent also.