The general formula for a disaccharide is ...... .

The incorrect statement among the following is:

Given below are two statements $:$
Statement $I: D-(+)-\text{glucose} + D-(-)-\text{fructose} \xrightarrow{-H_2O} \text{sucrose}$
$\text{sucrose} \xrightarrow{\text{Hydrolysis}} D-(+)-\text{glucose} + D-(-)-\text{fructose}$
Statement $II:$ Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements,choose the correct answer from the options given below $:$

$A$ sugar '$X$' dehydrates very slowly under acidic conditions to give furfural,which on further reaction with resorcinol gives a coloured product after some time. Sugar '$X$' is

How many products are produced respectively when optically pure glucose and fructose are reduced one by one by $NaBH_4$?

$\alpha-D$-glucose and $\beta-D$-glucose differ from each other due to the difference in the configuration of their carbon atom at: