$\alpha - D - (+)$ glucose and $\beta - D - (+)$ glucose are

An organic compound gives a positive result for Molisch's test as well as Benedict's test,but it does not give a positive result for Seliwanoff's test. Most probably,it is:

Which one of the following is $NOT$ a disaccharide?

How many secondary hydroxyl groups are present in glucose?

Maltose contains how many oxygen atoms?

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 $:$