When amylases catalyse the hydrolysis of starch,the final product obtained is chiefly

Which of the following pentoses will be optically active?
$I$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$II$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$
$III$: $CHO-CH(OH)-CH(OH)-CH(OH)-CH_2OH$

The following compounds differ in respect of

Natural glucose is termed $D$-glucose because

When one mole of lactose is hydrolysed,the hydrolysate contains

Methyl $-\alpha-D$-glucoside and methyl $-\beta-D$-glucoside are both ...... .