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प्रश्न
Give a simple chemical test to distinguish between the following pair of compounds:
Ethanal and Propanal
उत्तर
Ethanal gives the iodoform test, but propanal does not.
\[\ce{CH3CHO + \underset{Hypoiodite}{\underset{Sodium}{3NaOI}} ->[NaOH/I2][Heat] HCOONa + \underset{yellow ppt}{CHI3\downarrow} + 2NaOH}\]
संबंधित प्रश्न
Distinguish between:
C6H5-COCH3 and C6H5-CHO
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 :
How will you convert ethanal into the following compound?
But-2-enoic acid
Give a simple chemical test to distinguish between the following pair of compounds:
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Give a simple chemical test to distinguish between the following pair of compounds:
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Give a simple chemical test to distinguish between the following pair of compounds:
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Give a simple chemical test to distinguish between the following pair of compounds:
Pentan-2-one and Pentan-3-one
Give a simple chemical test to distinguish between the following pair of compounds:
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An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.
Which of the following compounds gives a positive Tollen's test but negative Fehling's test?
Which sugar does not reduce Fehling's solution?
Ammonical silver nitrate solution is called
Which of the following tests/reactions is given by aldehydes as well as ketones?
What is the composition of Fehling's reagent?
The major products formed in the following reaction sequence A and B are:
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:
- \[\ce{RCN ->[reduction]}\]
- \[\ce{RCN ->[(i) CH3MgBr][(ii) H2O]}\]
- \[\ce{RNC ->[hydrolysis]}\]
- \[\ce{RNH2 ->[HNO2]}\]
An organic compound 'A' with molecular formula C5H8O2 is reduced to n-pentane with hydrazine followed by heating with NaOH and glycol. 'A' forms a dioxime with hydroxylamine and gives a positive iodoform and Tollen's test. Identify 'A' and give its reaction for iodoform and Tollen's test.
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.
