Which of the following carbohydrates is not a disaccharide?

Carbohydrates are commonly stored as starch in plant storage organs. Which of the following five properties $(A-E)$ make starch useful as a storage material?
$(a)$ Easily translocated
$(b)$ Chemically non-reactive
$(c)$ Easily digested by animals
$(d)$ Osmotically inactive
$(e)$ Synthesized during photosynthesis
Useful properties:

The sugar present in milk is

Which of the following statements is inconsistent with the properties of a monosaccharide?

What is the general formula or structural formula of a polysaccharide?

Statement $P$: The general formula of carbohydrates is $C_n(H_2O)_n$ or $C_n(H_2O)_m$.
Statement $Q$: In the structure of monosaccharides,the values of $n$ and $m$ are equal.