NEET Practice Questions (MCQs) with Answers & Solutions

The sweetness index of various sugars is a measure of their relative sweetness compared to sucrose (which has a sweetness index of 100). For fructose, the sweetness index is approximately 173, for glucose it is about 74, and for lactose, it is around 16. Thus, the correct option is 173, 74, 16.

Before alcohol can be obtained from starch, the starch must first be broken down into simpler sugars. This process involves the conversion of starch into maltose by the action of the enzyme amylase. Maltose is then further broken down into glucose, which is subsequently fermented to produce alcohol. Therefore, the correct answer is maltose.

Maltose is a disaccharide composed of two glucose molecules. When maltose undergoes hydrolysis, it breaks down into two glucose molecules. Therefore, the correct answer is maltose.

Both maltose and lactose are reducing sugars. They can reduce Fehling’s solution and also form phenyl hydrazone with phenyl hydrazine.

Sucrose is a non-reducing sugar because it does not have a free aldehyde or ketone group, which is necessary for reducing Fehling's solution.

The enzyme emulsine, also known as beta-glucosidase, hydrolyzes lactose into glucose and galactose.

Maltose is a dextrorotatory sugar and exhibits mutarotation, which is the change in the optical rotation due to the change in the equilibrium between two anomers, alpha and beta forms.

Sucrose is a dextrorotatory sugar but does not exhibit mutarotation because it is a non-reducing sugar and does not have a free aldehyde or keto group to participate in the mutarotation process.