Question

Which from following pairs of carbohydrates contains galactose in both of them as one of the constituent ?

• A. Sucrose and maltose
• B. Maltose and lactose
• C. Lactose and Raffinose
• D. Sucrose and lactose

Hint:

Lactose is glucose plus galactose, and raffinose has galactose, glucose and fructose.

Answer 1

The Correct Option is C

Step 1: Recall the units
Sucrose = glucose + fructose. Maltose = glucose + glucose. Lactose = glucose + galactose. Raffinose = galactose + glucose + fructose (a trisaccharide).

Step 2: Check (A) and (B)
Sucrose and maltose contain no galactose. In (B), maltose has none, even though lactose has.

Step 3: Check (D)
Sucrose has no galactose, even though lactose has.

Step 4: Check (C)
Lactose has galactose and raffinose has galactose, so both contain it.

Final Answer:
Lactose and raffinose both have galactose. This is option (C). \[ \boxed{\text{(C) }\text{Lactose and Raffinose}} \]