What happenes when `D-`glucose is treated with the following reagents?
(i). `HI`
(ii).Bromine water
(iii). `HNO_(3)`

Explanation

(i) On protongcol heating with HI, D-glucose forms n-hexane.
`underset(CH_(2)OH)underset(|)overset(CHO)overset(|)((CHOH)_(4))overset(HI_(2)Delta)rarrCH_(3)-underset(n-"Hexane")(CH_(2))-CH_(2)-underset(D-"glocose")(CH_(2)-CH_(3))`
(ii) D-glucose gets oxidised to six carbon carboxylic acid on reaction with bromine water
`{:(CHO), (|), ((CHOH)_(4) overset(Br_(2)"water")(to)COOH),(| " "|) , (CH_(2)OH " "(CHOH)_(4)), ("D- glucose" " "|), ( " "CH_(2)OH), (" ""Gluconic acid"):}`
(iii) On oxidation with nitric acid , D -glucose yield as saccharic acid .
`{:(CHO " " COOH) , (| " "|), ((CHOH)_(4) overset(HNO_(3))underset("Oxidation")(to) (CHOH)_(4)),(|" "|), (CH_(2)OH " "COOH), ("D-glucose" " ""D-Saccharic acid"):}`