Organic solvents used in the pharmaceutical industry constitute a significant proportion of chemical waste.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Shikimic acid is used as an intermediate in the synthesis of the antiviral drug oseltamivir (Tamiflu). The structure of shikimic acid is as given below. Identify two different named functional groups in the molecule of shikimic acid.

Shikimic acid is used as an intermediate in the synthesis of the antiviral drug oseltamivir (Tamiflu). The structure of shikimic acid is as given below. Deduce the number of stereoisomers of shikimic acid (assume no E/Z isomerism in this compound).