MCQ
$\text{IUPAC}$ name of the compound $\mathrm{PhCH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{COOH}$ is:
- A$3-$Phenylpropanoic acid
- B$4-$Phenylpropanoic acid
- ✓$4-$Phenylbutanoic acid
- D$4-$Phenylpentanoic acid
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If the rate of formation of $B$ is set to be zero then the concentration of $B$ is given by :