Ncert Exercises & Solutions

The incorrect statement among the following regarding glucose is:

1.	It is an aldohexose.
2.	n-Hexane is formed when glucose is heating with HI.
3.	It is present in furanose form.
4.	It does not give 2, 4- DNP test.

HINT: Glucose is present in pyranose ring.

Explanation:

1. Glucose is an aldohexose having structural formula.

2. Glucose on heating with HI produces n-hexane.

$C_{6} H_{12} O_{6}$ $\overset{HI}{\to}$ $C_{6} H_{14}$

3. Glucose does not give 2, 4, DNP test due to it's existence as a cyclic structure shown below :

4. It is present in pyranose form, as shown below :

Pyranose means pyran (membered ring containing oxygen) like structure.