Give chemical reactions to show glucose :
(a) all the six carbon atoms are linked in a straight chain.
(b) one aldehyde group is present.

Write a reaction which shows that all the carbon atoms in glucose are in a straight chain.

How do you explain the presence of all the six carbon atoms in glucose in a straight chain?

Write chemical reaction to show that open structure of D-glucose contains the following: (i) Straight chain (ii) Five alcohol groups (iii) Alsehyde as carbonyl group

Give one chemical reaction to show that tin (II) is a reducing agent whereas Pb (II) is not .

Explain the following: Reaction of glucose that indicates that the carbonyl group is present as an aldehydic group in the open structure of glucose.

PASSAGE-II : In all the organic compounds, the four valencies of carbon atom must be satisfied, either by single, double or triple bonds. It is not possible to get a compound in which the carbon atom has valencies either less or more than four. In these compounds carbon atoms can be linked together in the form of straight chains, branched chains or even ring chains. The compound in which a double bond is present between two carbon atoms is

Assertion : Carboxylic acids contain a carbonyl group but donot give the characteristic reactions of the group. Reason : The electrophilicity of the carbon atom is more in carboxylic acids than in aldehydes and ketones.