HARD
Earn 100

Give reasons to support the answer:

3–Hydroxy pentan-2-one shows positive Tollen’s test. 

Important Questions on Aldehydes, Ketones and Carboxylic Acids

EASY
Which of the following aldehydes does not react with Fehling's solution?
MEDIUM
An organic compound X with molecular formula C11H14 gives an optically active compound on hydrogenation. Upon ozonolysis, X produces a mixture of compounds -P and Q. Compound P gives a yellow precipitate when treated with I2 and NaOH but does not reduce Tollen's reagent. Compound Q does not give any yellow precipitate with I2 and NaOH but gives Fehling's test. The compound X is:
MEDIUM

Given below are two statements :

Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Statement II : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.

In the light of the above statements, choose the most appropriate answer from the options given below :

EASY

Which is the most suitable reagent for the following conversion?

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HARD

Identify the product of the following reaction :

C2H5-CO-CH3NaOH/I2 ?

MEDIUM

Which of the following reagents are used to distinguish aldehydes from Ketones?

I. Fehling's reagent 

II. Lucas reagent

III. Hinsberg's reagent

IV. Tollens reagent

MEDIUM

Give the plausible explanation for the following:

Glucose doesn’t give 2,4-DNP test.

HARD
Compound AC9H10O shows positive iodoform test. Oxidation of A with KMnO4/KOH gives acid BC8H6O4 . Anhydride of B is used for the preparation of phenolphthalein. Compound A is:
EASY
Give one chemical test each to distinguish between the following pairs of compounds: Acetone and benzaldehyde.
HARD

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Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?

HARD
An organic compound with the molecular formula C9H10O forms 2, 4-DNP derivative, reduces Tollens’ reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. Identify the compound.
EASY
Write down the following reaction with chemical equation: Iodoform reaction.
MEDIUM
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. Identify the compound and write equations for chemical reactions involved.
EASY
On heating an aldehyde with Fehling's reagent, a reddish brown precipitate is obtained due to the formation of
EASY
Which is the major product formed when acetone is heated with iodine and potassium hydroxide?