



Step 1: Identifying the Biodegradable Polymer Components.
Biodegradable polymers are those that can be broken down by microorganisms into natural substances such as water and carbon dioxide.
Step 2: Recognizing Monomers.
- A well-known biodegradable polymer is Polyhydroxyalkanoates (PHAs), which are derived from hydroxy acids.
- The monomers given in option (4) contain hydroxyl (-OH) and carboxyl (-COOH) functional groups, making them ideal candidates for forming biodegradable polymers.
- Other options include amino acids and linear dicarboxylic acids, which are less commonly used in biodegradable polymer formation.
Step 3: Conclusion. Since hydroxy acids serve as monomers for biodegradable polymers like polyhydroxybutyrate (PHB), option (4) is the correct choice.

Which of the following are ambident nucleophiles?
[A.] CN$^{\,-}$
[B.] CH$_{3}$COO$^{\,-}$
[C.] NO$_{2}^{\,-}$
[D.] CH$_{3}$O$^{\,-}$
[E.] NH$_{3}$
Identify the anomers from the following.

The standard Gibbs free energy change \( \Delta G^\circ \) of a cell reaction is \(-301 { kJ/mol}\). What is \( E^\circ \) in volts?
(Given: \( F = 96500 { C/mol}\), \( n = 2 \))