Which among the following reagents is used to obtain gluconic acid from glucose?

The intermediate compound formed in the conversion of $Starch$ to $Glucose$ is

Which one of the following statements is not true?

Carbohydrates are used by the body mainly:

$\alpha-D$-glucose and $\beta-D$-glucose differ from each other due to the difference in the configuration of their carbon atom at:

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