Ncert Solutions Chemistry Class 12th
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New answer posted
5 months agoContributor-Level 10
This is a long answer type question as classified in NCERT Exemplar
Here, 'A' is NO2 (Nitrogen dioxide)
'B' is N2O4 (dinitrogen tetraoxide)
'C' is N2O3 (dinitrogen trioxide)
A brown gas is produced when lead nitrate (II) is heated
2Pb (NO3)2 
2PbO + 4NO2 + O2
2NO2 
N2O4
2NO + N2O4 
2N2O3
New answer posted
5 months agoContributor-Level 10
This is a long answer type question as classified in NCERT Exemplar
'A' is S8 'B' is SO2 gas
S8 + 8O2 
8SO2
2MnO4 – + 5SO2 + 2H2O → 5 SO42– + 4H+ + 2Mn2+
(violet) (colourless)
2Fe3+ + SO2 + 2H2O → 2Fe2+ + SO42– + 4H+
New answer posted
5 months agoContributor-Level 10
Resonating structures of phenoxide are-
In structure I and V negative charge is on E.N. Oxygen, in other cases, it is on Less E.N Carbon hence they contribute less towards stability. And the negative charge is localized.
Resonating structures of carboxylic acid-
Both the structures have –ve charge on oxygen and electron are delocalised too hence, the carboxylic acid is more stable and acidic than phenol.
New answer posted
5 months agoContributor-Level 10
1. Cyclohexanone forms cyanohydrin in good yield because the ketonic group has very less steric hindrance at both the ortho position but 2,2,6 tri methyl cyclohexanone have high steric hindrance which reduces the attack from CN nucleophile.
New answer posted
5 months ago
Contributor-Level 10
1. When 1- phenyl ethane is oxidized with a strong oxidizing agent like KMnO4, it forms a benzoic acid ion.
4. When benzene is mixed with benzoyl chloride in presence of Anhyd.AlCl3 to give benzophenone.
5. When 4-oxocyclohexanecarbeldehyde is treated with tollens reagent it gets oxidized to carboxylate anion as it is aldehyde it reduces tollens reagent.
6. When 2-formyl benzoic acid is treated with NaCN it produces 2-[1-hydroxycyanom
New question posted
5 months ago
New question posted
5 months agoNew answer posted
5 months agoContributor-Level 10
1. Acetylation refers to the process of introducing an acetyl group (resulting in an acetoxy group) into a compound, namely the substitution of an acetyl group for an active hydrogen atom. A reaction involving the replacement of the hydrogen atom of a hydroxyl group with an acetyl group (CH3CO) yields a specific ester, the acetate. Acetic anhydride is commonly used as an acetylating agent reacting with free hydroxyl groups., this reaction is usually carried out in the presence of base like pyridine.
2. Aldeydes having no α-H undergo the disproportion reaction in the presence of Strong alkali, it is a chemical reacti
New answer posted
5 months agoContributor-Level 10
1. When propanone reacts with NaBH4 it will form propan-2-ol.This alcohol is dehydrated to form propene.
2. When benzoic acid is treated with SOCl2 it chlorinates the acid. After controlled hydrogenation it forms benzaldehyde
3. When ethanol is treated with Cu at 573 k, it will oxidize to ethanal. When ethanal is treated with Dil.NaOH it will form 3-Hydroxy butanal
4. After frieadal craft acylation of benzene it will convert into acyl benzene. And further treating with nitrating mixture it forms m-nitroaceto phenone .
5. When benzaldehyde is oxidized with dichromate and treated with calcium carbonate it forms calcium salt. And after dry di
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