Advertisements
Advertisements
प्रश्न
Write chemical test to distinguish between the following compounds:
Phenol and Benzoic acid
Advertisements
उत्तर
Phenol and Benzoic Acid can be distinguished by the iron chloride FeCl3 test. As phenol gives violet colouration with neutral FeCl3, solution while benzoic acid gives buff-coloured precipitate of ferric benzoate.
\[\ce{6C6H5OH + FeCl3 -> [\underset{Violet complex}{Fe(OC6H5)6]^{3-}} + 3H^{+} + 3HCl}\]
\[\ce{\underset{Benzoic acid}{3C6H5COOH} + FeCl3 -> \underset{Buff coloured ppt.}{(C6H5COO)3Fe} + 3HCl}\]
APPEARS IN
संबंधित प्रश्न
A and B are two functional isomers of compound C3H6O.On heating with NaOH and I2, isomer B forms yellow precipitate of iodoform whereas isomer A does not form any precipitate. Write the formulae of A and B.
Predict the products of the following reactions :
Oxidation of ketones involves carbon-carbon bond cleavage. Name the products formed on oxidation of 2, 5-dimethylhexan-3-one.
Which of the following compounds gives a positive Tollen's test but negative Fehling's test?
Acetaldehyde cannot show?
An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:
The correct set of products obtained in the following reactions:
- \[\ce{RCN ->[reduction]}\]
- \[\ce{RCN ->[(i) CH3MgBr][(ii) H2O]}\]
- \[\ce{RNC ->[hydrolysis]}\]
- \[\ce{RNH2 ->[HNO2]}\]
Choose the reaction which is not possible:
An organic compound 'A' with the molecular formula C4H8O2 undergoes acid hydrolysis to form two compounds 'B' and 'C'. Oxidation of 'C' with acidified potassium permanganate also produces 'B'. Sodium salt of 'B' on heating with soda lime gives methane.
- Identify 'A', 'B' and 'C'.
- Out of 'B' and 'C', which will have higher boiling point? Give reason.
Fehling’s solution ‘A’ is ______.
