Which of the following compounds is obtained when glucose is heated with $HI$ for a long time?

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.)

Which of the following does not show mutarotation?

Glucose gives a positive test with

The indigestible carbohydrate,which is also a constituent of our diet,is

Which of the following functional groups are present in $Glucose$ $(C_6H_{12}O_6)$?