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.

                       C6H12O6 HI C6H14

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.