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प्रश्न
While studying saponification reactions, the following comments were noted down by the students :
(I) Soap is a salt of fatty acids.
(II) The reaction mixture is basic in nature.
(III) In this reaction heat is absorbed.
(IV) This reaction is not a neutralisation reaction.
Which of these are the correct comments ?
(A) I and III only
(B) I, II and III
(C) II, III and IV
(D) I and II only
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उत्तर
Soap is a salt of fatty acids and it's chemical formula is RCOO-Na+, where R denotes any long chain alkyl group having 12 to 18 carbon atoms.
The saponification reaction is exothermic in nature. In saponification reaction, the reaction mixture is basic in nature before the reaction, and can be basic after the reaction if NaOH is taken in excess.
Saponification reaction is not a neutralisation reaction. It does not involve formation of water molecule.
Hence, the correct option is D.
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संबंधित प्रश्न
A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:
(a) There is no change in the blue litmus paper and the red litmus paper turns white.
(b) There is no change in the red litmus paper and the blue litmus paper turns red.
(c) There is no change in the blue litmus paper and the red litmus paper turns blue.
(d) No change in colour is observed in both the litmus papers
When ethanol reacts with ethanoic acid in the presence of conc. H2SO4, a substance with fruity smell is produced. Answer the following:-
(i) State the class of compounds to which the fruity smelling compounds belong. Write the chemical equation for the reaction and write the chemical name of the product formed.
(ii) State the role of conc. H2SO4 in the reaction.
While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt to the reaction mixture. The function of common salt in this reaction is to
(A) reduce the alkalinity of the soap
(B) reduce the acidity of the soap
(C) enhance the cleansing capacity of soap
(D) favour precipitation of soap
Write the IUPAC names, common names and formulae of the first two members of the homologous series of carboxylic acids.
Give the common names and IUPAC names of the following compounds of HCOOH.
What do you notice when acetic acid reacts with metals?
Acetic acid is a typical acid. Write one equation in case of its reactions with a carbonate.
Under what conditions does ethane get converted to ethyl alcohol?
Write balanced euation for the following :
Ethane is burnt in air.
Draw the structural formula of a compound with two carbon atoms in the following case:
An alcohol containing two carbon atoms.
