What is the bond length between $H$ and $O$ atoms in a water molecule?

Select the correct option indicating the products of the following reaction:
Lactose $\xrightarrow{\text{Lactase}}$ $\square$ + $\square$

Which of the following carbohydrates is synthesized by nature on the largest scale?

Which of the following is an animal polysaccharide?

Which of the following is a monosaccharide?

Which monosaccharide does not exhibit optical isomerism?