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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Chemistry Test1.
Write a note on haloform reaction.
2.
What is formalin? Write its use.
3.
What is urotropine? Give its use.
4.
Does formaldehyde undergo aldol condensation? Justify your answer.
5.
Name one reagent used to distinguish acetaldehyde and acetone.
1.
Acetaldehyde and methyl ketones, containing \(\\ \\ { CH }_{ 3 }-\underset { \overset { | }{ O } }{ C } -group\) , when treated with halogen and alkali give the corresponding haloform. This is known as Haloform reaction
\({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { { 3Cl }_{ 2 } }{ \underset { Na }{ \longrightarrow } } { CCl }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { NaOH }{ \longrightarrow } { CHCl }_{ 3 }+{ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -ONa\)
2.
(i) 40 % aqueous solution of formaldehyde is known as formalin.
(ii) It is used as a preservative for biological specimens and in leather tanning.
3.
Hexamethylene tetramine formed by the reaction of formaldehyde and ammonia is called urotropine.
4.
(i) Formaldehyde does not undergo aldol condensation.
(ii) Aldol condensation reaction is the characteristic of carbonyl compounds having a hydrogen atom. So this reaction does not take place in formaldehyde.
5.
(i) Schiff's reagent is used to .distinguish acetaldehyde and acetone.
(ii) Acetaldehyde restores the original colour (red-pink) of the Schiff's reagent.
(iii) Acetone does not restore this colour.
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