
Concept explainers
a)
Interpretation:
The product obtained when D-galactose reacts with nitric acid is to be stated.
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
Epimers are pair of stereoisoisomers which differ in configuration at one stereogenic center. In D-galactose molecule one terminal
Nitric acid has the chemical formula
a)

Answer to Problem 31P
The product obtained when D-galactose reacts with nitric acid is given below,
Figure 1
Explanation of Solution
The product obtained when D-galactose reacts with nitric acid is as follows,
Figure 1
b)
Interpretation:
The product obtained when D-galactose reacts with
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
Epimers are pair of stereoisoisomers which differ in configuration at one stereogenic center. In D-galactose molecule one terminal aldehydic and one terminal alcoholic group is present. The given ions
b)

Answer to Problem 31P
The product obtained when D-galactose reacts with
Figure 2
Explanation of Solution
The product obtained when D-galactose reacts with
Figure 2
The given ions
c)
Interpretation:
The product obtained when D-galactose reacts with
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
Epimers are pair of stereoisoisomers which differ in configuration at one stereogenic center. In D-galactose molecule one terminal aldehydic and one terminal alcoholic group is present.
c)

Answer to Problem 31P
The product obtained when D-galactose reacts with
Figure 3
Explanation of Solution
The product obtained when D-galactose reacts with
Figure 3
The product obtained when D-galactose reacts with
d)
Interpretation:
The product obtained when D-galactose reacts with excess
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
d)

Answer to Problem 31P
The product obtained when D-galactose reacts with excess
Figure 4
Explanation of Solution
The product obtained when D-galactose reacts with excess
Figure 4
e)
Interpretation:
The product obtained when D-galactose reacts with
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
e)

Answer to Problem 31P
The product obtained when D-galactose reacts with
Figure 5
Explanation of Solution
The product obtained when D-galactose reacts with
Figure 5
f)
Interpretation:
The product obtained when D-galactose reacts with ethanol
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
f)

Answer to Problem 31P
The product obtained when D-galactose reacts with ethanol
Figure 6
Explanation of Solution
The product obtained when D-galactose reacts with ethanol
Figure 6
g)
Interpretation:
The products obtained when D-galactose reacts with the given reactants are to be stated.
Concept Introduction:
D-galactose is a monosaccharide molecule and it is sweet in taste as glucose. It is C-
g)

Answer to Problem 31P
The products obtained when D-galactose reacts with the given reactants are shown in figure 7.
Figure 7
Explanation of Solution
The given reactants are hydroxylamine/trace acid, acetic anhydride/heat and
Figure 7
In the above reaction D-galactose first reacts with hydroxylamine in the presence of an acid, a compound of oxime is formed. Then it reacts with acetic anhydride with heat gives nitrile compound. Now, nitrile compound undergoes a reaction with base a compound D-Lyxose is formed.
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Chapter 21 Solutions
Organic Chemistry
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