Question:
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
Updated On: May 12, 2024
- ferrous ferricyanide
- ferric ferrocyanide
- potassium ferricyanide
- potassium ferrocyanide
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The Correct Option is B
Solution and Explanation
To a part of sodium extract, $FeSO _{4}$ solution is added and the contents are warmed. A few drops of $FeCl _{3}$ solution are then added and resulting solution is acidified with conc. HCl. The appearance of bluish green or Prussian blue colouration confirms the presence of nitrogen. The reactions that occur during this test are as
$2 NaCN + FeSO _{4} \longrightarrow Na _{2} SO _{4}+ Fe ( CN )_{2}$
$Fe ( CN )_{2}+4 NaCN \longrightarrow \underset{\text{Sodium ferrocyanide}}{Na _{4}\left[ Fe ( CN )_{6}\right]}$
$3 Na _{4}\left[ Fe ( CN )_{6}\right]+4 FeCl _{3} \longrightarrow$
$\underset{\text{Ferric ferrocyanide (Prussian blue)}}{Fe _{4}\left[ Fe ( CN )_{6}\right]_{3}}+12 NaCl$
$2 NaCN + FeSO _{4} \longrightarrow Na _{2} SO _{4}+ Fe ( CN )_{2}$
$Fe ( CN )_{2}+4 NaCN \longrightarrow \underset{\text{Sodium ferrocyanide}}{Na _{4}\left[ Fe ( CN )_{6}\right]}$
$3 Na _{4}\left[ Fe ( CN )_{6}\right]+4 FeCl _{3} \longrightarrow$
$\underset{\text{Ferric ferrocyanide (Prussian blue)}}{Fe _{4}\left[ Fe ( CN )_{6}\right]_{3}}+12 NaCl$
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Organic Chemistry - Some Basic Principles and Techniques
Organic Chemistry is a subset of chemistry dealing with compounds of carbon. Therefore, we can say that Organic chemistry is the chemistry of carbon compounds and is 200-225 years old. Carbon forms bond with itself to form long chains of hydrocarbons, e.g.CH4, methane and CH3-CH3 ethane. Carbon has the ability to form carbon-carbon bonds quite elaborately. Polymers like polyethylene is a linear chain where hundreds of CH2 are linked together.
Read Also: Organic Compounds
Importance of Organic Chemistry:
Organic chemistry is applicable in a variety of areas including-
- Medicines: Example- Aspirin which is a headache medicine and Ibuprofen is a painkiller, both are organic compounds. Other examples include paracetamol.
- Food: Example- Starch which is a carbohydrate is an organic compound and a constituent of rice and other grains. It is the source of energy.
- Clothing: Example- Nylon, Polyester and Cotton are forms of organic compounds.
- Fuels: Examples- Gasoline, Petrol and Diesel are organic compounds used in the automobile industry at large.