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Catalyst SnCl2/HCl is used in
Catalyst SnCl2/HCl is used in Stephen’s reaction. which helps in formation of nascent hydrogen on reacting with acid. The Stephen's reaction is used to prepare aldehydes from nitriles or cyanides. The reduction of nitriles with stannous chloride and hydrogen chloride in ethyl acetate solvent produces imine intermediate.
The appropriate reagent for the transformation :
In this reaction, a CO group is converted to CH2 group. This can be achieved by Wolff-Kishner reduction which uses reagent NH2NH2, OH− (hydrazine in alkaline medium). Clemmensen reduction (Zn(Hg)/HCl) cannot be used as in presence of HCl, the alcohol may undergo dehydration.
Fehling's solution is a mixture of two solutions. While one solution contains CuSO4, the other contains
Fehling's solution consists of CuSO4 solution mixed with alkaline solution of sodium potassium tartrate also called Rochelle salt.
The below reaction is known as
Benzilic acid rearrangement
The reagents which can be used to distinguish acetophenone from benzophenone is (are)
The structures of acetophenone and benzophenone are . When acetophenone containing is treated with l2 and Na2CO3 it forms yellow precipitate of CHI3 whereas benzophenone does not give this test. Acetophenons gives iodoform test due to presence of'-COCH3 group.
Paraldehyde is used as a:
Uses for paraldehyde: medicinal use
Paraldehyde is used to treat certain convulsive disorders. It also has been used in the treatment ofalcoholism and in the treatment of nervous and mental conditions to calm or relax patients who are nervous or tense and to produce sleep.
Predict the product 'B' in the sequence of reaction
Propanal on reaction with dilute sodium hydroxide forms:
It is an example of aldol condensation. Propanal on reaction with dilute sodium hydroxide forms CH3CH2CH(OH)CH(CH3)CHO (3-hydroxy-2-methylpentanal).
Ketones react with Mg−Hg over water gives:
Which of the following reagents is used to distinguish acetone and acetophenone?
acetophenone being aromatic ketone does not form adduct with NaHCO3 whereas acetone does
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