Which of the following contain $\mathrm{\beta }$-1, 4 linkage?

• Maltose

• Sucrose

• Lactose

• Fructose

C.

Lactose

Lactose or milk sugar (carbohydrate) is reducing sugar formed through $\mathrm{\beta }$- 1, 4 condensation between galactose and glucose. Lactose does not occur in nature except as a product of the mammary gland. It is highest in human milk as compared to that of cow, buffalo and goat. Lactose is a product of glucose, fructose and galactose.

Maltose or malt sugar is a disaccharide formed from two units of glucose joined with an $\mathrm{\alpha }$ (1$\to$4) bond. It is found in germinating grain, in a small proportion in corn syrup and forms on the partial hydrolysis of starch.

Sucrose or table sugar is a disaccharide where a molecule is composed of two monosaccharides, glucose and fructose. It is produced naturally in plants, from which table sugar is refined. It is extracted and refined from either sugar cane or sugar beet.

Fructose or fruit sugar is a simple ketonic monosaccharide found in many plants, where it is often bonded to glucose to form disaccharide sucrose.