Is cellulose ketohexose or aldohexose? how does cellulose give result in seliwanoff’s test (any color change)?

Cellulose is an aldohexose

Explanation:

Cellulose is an aldohexose  , because , it has an aldehyde group present at one of the end .

Seliwanoff’s test

It is the test to differentiate between a ketose and an aldose .

The test is as follows -

If the sample is heated and it it readily gets dehydrated , then the sample is a ketose .

And , the reaction of   Seliwanoff’s reagent and  ketose , give a red color , which is the positive sign for the test .

But ,

the reaction of   Seliwanoff’s reagent and  aldoses , give a very light pink color .

where are the choice options?

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.