Advertisements
Advertisements
Question
What happens when D-glucose is treated with the following reagent?
HI
Advertisements
Solution
When D-glucose is heated with HI for a long time, n-hexane is formed.
\[\begin{array}{cc}
\ce{CHO}\phantom{...............................................}\\
|\phantom{..................................................}\\
\ce{(CHOH)4 ->[HI][\Delta] \underset{n-hexane}{CH3 - CH2 - CH2 - CH2 - CH2 - CH3}}\\
|\phantom{..................................................}\\
\ce{\underset{{D-glucose}}{CH2OH}}\phantom{..........................................}
\end{array}\]
APPEARS IN
RELATED QUESTIONS
How many moles of acetic anhydride will be required to form glucose pentaacetate from 2M of glucose?
(a) 2
(b) 5
(c) 10
(d) 2.5
Maltose is a
(a) Polysaccharide
(b) Disaccharide
(c) Trisaccharide
(d) Monosaccharide
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(iodoform, acetaldehyde, positive, greater, acidic, acetone, disaccharide, negative, increases, glucose, decreases, chloroform, polysaccharide, lactose, lesser, basic, cationic hydrolysis, anionic hydrolysis)
Sucrose is a _________ and yields upon hydrolysis, a mixture of ________ and fructose.
Write the reactions involved when D-glucose is treated with the following reagent:
H2N-OH
Choose the appropriate answer(s) for the below representation from the options given


Which of the following statements is incorrect regarding glucose?
Reduction of glucose by HI suggest that ____________.
The number of chiral carbon atoms present in cyclic structure α-D(+) glucose:
The α-D glucose and β-D glucose differ from each other due to difference in carbon atom with respect to its ____________.
Choose the correct relationship for glucose and fructose:
The number of chiral carbons in ß-D(+) glucose is ____________.
Which one of the following reactions is not explained by the open chain Structure of glucose?
Three structures are given below in which two glucose units are linked. Which of these linkages between glucose units are between C1 and C4 and which linkages are between C1 and C6?
| (I) | ![]() |
| (II) | ![]() |
| (III) | ![]() |
On the basis of which evidences D-glucose was assigned the following structure?
\[\begin{array}{cc}
\ce{CHO}\\
|\phantom{....}\\
\phantom{..}\ce{(CHOH)4}\\
|\phantom{....}\\
\phantom{..}\ce{CH2OH}
\end{array}\]
Account for the following:
There are 5 OH groups in glucose
Account for the following:
What happens when D – glucose is treated with the following reagents
HNO3
Consider the following reactions:
(i) \[\ce{Glucose + R-OH ->[Conc. HNO3] [A] ->[X eq of][(CH3CO)2O] Acetyl derivative}\]
(ii) \[\ce{Glucose ->[Ni/H2] [A] ->[Y eq of][(CH3CO)2O] Acetyl derivative}\]
(iii) \[\ce{Glucose ->[Z eq of][(CH3CO)2O] Acetyl derivative}\]
'X, 'Y' and 'Z' in these reactions are respectively:
Glucose with excess of phenyl hydrazine forms ______.



