Consider the following statements:

1)    Carbohydrates are also known as Saccharides.

2)    Most common monosaccharide found in nature is glucose.

3)    Milk sugar is made up of a unit of glucose and lactose.

4)    Grapes mainly contain fructose.

5)    Glucose and fructose are examples of monosaccharides.

6)    Souring of milk occurs when bacteria converts lactose into lactic acid.

Select the correct statements.