Ncert Exercises & Solutions

14.9:What happens when D-glucose is treated with the following reagents?
(i) HI (ii) Bromine water (iii) HNO3

(i) When D-glucose is heated with HI for a long time, n-hexane is formed.
$C H O$
$|$
$(C H O H) {\to_{∆}^{H l}}_{} C H_{3} — C H_{2} — C H_{2} — C H_{2} — C H_{2} — C H_{2}$
$|$
$C H_{2} O H$
$D - g u l \cos e$

(ii) When D-glucose is treated with Br2 water, D- gluconic acid is produced.

$C H O C H O O H$
$| |$
${(C H O H)}_{4} \overset{B r_{2} w a t e r}{\to} {(C H O H)}_{4} | C H_{2} O H$
$C H_{2} O H D - g l u c o n i c a c i d$

(iii) On being treated with HNO3, D-glucose get oxidised to give saccharic acid.

$C H O C O O H$
$| |$
${(C H O H)}_{4} \overset{H N O_{3}}{\to} {(C H O H)}_{4}$
$| |$
$C H_{2} O H C H O O H$
$D - g l u \cos e S a c h a r i c a c i d$

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