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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 1 · Set 1 · Q25
Write the reactions of D-Glucose with the following: (a) HI (b) Br_2 water (c) Conc. HNO_3
Write the reactions of D-Glucose with the following :
(a)
HI
(b)
$\displaystyle \mathrm{Br}_{2}$ water
(c)
Conc. $\displaystyle \mathrm{HNO}_{3}$
Marking-scheme solution
(a)
$\displaystyle \begin{matrix}\mathrm{CHO}\\ |\\ \mathrm{(CHOH)_4}\\ |\\ \mathrm{CH_2OH}\end{matrix}\ \xrightarrow{\ \mathrm{HI},\ \Delta\ }\ \mathrm{CH_3\!-\!(CH_2)_4\!-\!CH_3}$
(b)
$\displaystyle \mathrm{CHO\!-\!(CHOH)_4\!-\!CH_2OH}\ \xrightarrow{\ \mathrm{Br_2\ water}\ }\ \begin{matrix}\mathrm{COOH}\\ |\\ \mathrm{(CHOH)_4}\\ |\\ \mathrm{CH_2OH}\end{matrix}$
(c)
$\displaystyle \begin{matrix}\mathrm{CHO}\\ |\\ \mathrm{(CHOH)_4}\\ |\\ \mathrm{CH_2OH}\end{matrix}\ \xrightarrow{\ \mathrm{Conc.\ HNO_3}\ }\ \begin{matrix}\mathrm{COOH}\\ |\\ \mathrm{(CHOH)_4}\\ |\\ \mathrm{COOH}\end{matrix}$
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.