139. The organic compound 5-allylcyclohex-3-ene-1-ol is reacted with cold, dilute, aqueous solution of $\mathrm{KMnO}_4$. The total number of hydroxyl group(s) $(-\mathrm{OH})$ present in the product is

The molecular formula of the product formed when benzene is reacted with excess of chlorine molecules under ultra-violet light is

The order of decreasing reactivity towards an electrophilic reagent, for the following compounds, is

(i) benzene

(iii) chlorobenzene

(ii) toluene

(iv) phenol

The major product of the following reaction is

$$ \text { Glucose } \frac{\text { (i) } \mathrm{HI}, \Delta}{\text { (ii) } \mathrm{Mo}_2 \mathrm{O}_3, 773 \mathrm{~K}, 10 \cdot 20 \mathrm{am}} $$