Which of the following substances gives the iodine test?

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

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.)

The number of chiral carbon atoms present in the open-chain structure of $D-(-)$-fructose is:

All monosaccharides containing five or six carbon atoms exist in which form?

$C_{1}-C_{4}$ glycosidic bond is not found in