Iodoform can be prepared from all except :

Solution

Iodoform test is given by methyl ketones, acetaldehyde and secondary alcohols which contain – CH₃ groups at carbon containing – OH group.

isobutyl alcohol is a primary alcohol hence does'nt give positive iodoform test.

Aspirin is known as :

Ozonolysis of an organic compound ‘A’ produces acetone and propional dehyde in equimolar mixture. Identify’A’ from the following compounds:

Solution

From the products formed it is clear that the compound has 5 carbon atoms with a double bond and methyl group on 2^nd carbon atom.

Which of the following on heating with aqueous KOH,produces acetaldehyde?

A liquid was mixed with ethanol and a drop of concentrated H₂SO₄ was added. A compound with a fruity smell was formed. The liquid was :

Solution

Fruity smell is due to ester formation which is formed between ethanol and acid.

Which of the following compounds will give a yellow precipitate with iodine and alkali ?

(i)Acetophenone (ii)Acetamide

(iii)Methyl acetate (iv)2-Hydroxypropane

Consider the reaction :RCHO + NH₂NH₂ → RCH =N –NH₂ What sort of reaction is it ?

Solution

R – CH = O + H₂N – NH₂ → R – CH = N– NH₂ Such reactions take place in slightly acidic medium and involve nucleophilic addition of the ammonia derivative.

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (A), acetic acid(C) and formic acid (D) is :

Solution

CF₃COOH > CCl₃ COOH > HCOOH > CH₃COOH (k_aorder)

The halogenated acids are much stronger acids than the parent acid and more over the acidity among the halogenated acid is increased almost proportionately with the increase in electronegativity of the halogen present. Further formic acid having no alkyl group is more acidic than acetic acid

Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is :

Solution

Anhydrous alcohols add to the carbonyl group of aldehydes in the presence of anhydrous hydrogen chloride to form acetals via hemiacetals.

Predict the product in the given reaction.

Solution

Cannizzaro reaction - when an aldehyde containing no α– H undergo reaction in presence of 50% KOH. It disproportionates to form a molecule of carboxylic acid and a molecule of alcohol.

UnAttempted

0

Attempted

Correct

Wrong