What are the functional groups present in the structure of maltose $?$

Which sugar is called invert sugar? Why is it called so?

What is maltose composed of?

Which one of the following statements is not true regarding $(+)$ lactose?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Ketoses give Seliwanoff's test faster than Aldoses.
Reason $(R)$: Ketoses undergo $\beta$-elimination followed by formation of furfural.
In the light of the above statements,choose the correct answer from the options given below:

Glucose on prolonged heating with $HI$ gives: