Question

n. Substance is formed by the oxidation of an aldehyde. What will be the action of the
substance formed on the litmus solution?
a No action on litmus solution
Turns blue litmus red
c Turns red litmus blue
d. None of these​

Answer 1

A substance is formed by the oxidation of an aldehyde. The action of the

substance formed on the litmus solution will be:

b) Turns blue litmus red

• Aldehyde is a carbon compound and consists of a functional group −CHO.

• It is widely used for the production of certain polymeric materials like bakelite.

• When oxidation of aldehyde takes place, carboxylic acid is formed i.e. -COOH group .

• Since it is an acid and acid turns blue litmus red, therefore, after the oxidation of aldehyde, the resulting compound will turn blue litmus red.

Answer 2

Substance is formed by the oxidation of an aldehyde, the action of the  substance formed on the litmus solution Turns blue litmus red.

Explanation:

• Litmus is a water-soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.
• Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic (i.e. alkaline) conditions.
• The pigment in blue litmus reacts with  $H^+$ions and changes chemically so the bonds are 'tuned' to reflect a longer wavelength of light to appear red to our eyes. The pigment is absorbing the blue to green wavelengths when it reacts with the free hydrogen ions in acids,
• Otherwise the same pigment in base reacts differently with $OH^-$ ions and becomes 'tuned' to reflect the short wavelength to appear blue. Now it absorbs the green and red wavelengths having reacted with the hydroxyl ions in the base.

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