Which of the following monosaccharides are present as five membered cyclic structure (furanose structure)?

Define optical activity. How many optical isomers are possible for glucose.

Write the chemical reaction to elucidate-

• Glucose contains five -OH groups.

Give definition of monosaccharide and disaccharide and give one example for each. Give one reaction for each group to detect the presence of $-\mathrm{CHO}$ and $>\mathrm{C}=\mathrm{O}$ groups. Differentiate between glucose and fructose.

Write the chemical reaction to elucidate-

• Glucose contains six carbon atoms in a straight chain.