Which one is a disaccharide?

Which of the following carbohydrates has a glycosidic linkage?

What is the molecular formula of glyceraldehyde?

On hydrolysis,which of the following carbohydrates gives glucose only?

Which one of the following statements is not true regarding $(+)$ lactose?

What is the quantity of water required to obtain one mole of glucose from one mole of sucrose by acid hydrolysis (in $g$)?