Identify the product obtained in the reaction: Glucose $\xrightarrow{Br_2/H_2O}$ ?

With which reagent does glucose react to form a crystalline osazone derivative?

Raffinose is

Which of the following is a disaccharide?

For the complex conversion of $D^{-}$-glucose into the corresponding osazone,the minimum number of equivalents of phenylhydrazine required is:

Sugar is the main source of energy as it produces energy on metabolic decomposition. But these days low calorie drinks are more popular,why?