Glucose will show mutarotation when the solvent is

Lactose on hydrolysis gives

Which of the following pentoses exhibit optical activity?

$I$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$	$II$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$III$. $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$

(Note: The structures provided are $I$: Ribose,$II$: Arabinose,$III$: Xylose. All these are aldopentoses with chiral centers.)

Identify the product of the following reaction: $(C_6H_{10}O_5)_n + nH_2O \xrightarrow[393 \ K, 2-3 \ atm]{H^+} ?$

The formation of a silver mirror by the reaction of glucose with Tollens' reagent indicates the presence of which group?

Which of the following is a reducing sugar?