Question

Identify the correct set of monosaccharides present in sucrose (X), lactose (Y) and maltose (Z).

• A. X $\to$ glucose, fructose , Y $\to$ galactose, glucose , Z $\to$ glucose, fructose.
• B. X $\to$ glucose, fructose, Y $\to$ galactose, glucose, Z $\to$ glucose, glucose .
• C. X $\to$ glucose, glucose, Y $\to$ galactose, glucose, Z $\to$ glucose, glucose.
• D. X $\to$ galactose, glucose, Y $\to$ glucose, fructose , Z $\to$ glucose, glucose.

Answer 1

Answer: (B)

$(X) \longrightarrow $ Sucrose on hydrolysis gives glucose and fructose. i.e.

Sucrose $\longrightarrow $ glucose + fructose

$(Y) \longrightarrow $ Lactose on hydrolysis gives D-glucose and D-galactose. i.e.

Lactose $\longrightarrow $ D-glucose +D-galactose

$(Z) \longrightarrow $ Maltose on hydrolysis gives 2 units of glucose. i.e.

Maltose $\longrightarrow $ glucose + glucose