Question

2. A secondary alcohol having molecular formula C3H2O on treatment with Croz gives A)ethyl methyl ketone B)dimethyl ketone C)acetaldehyde D)propanaldehyde
​

Answer 1

Answer:

Correct option is

CH

3

CH(OH)CH

3

,CH

3

COCH

3

(X)−CH

3

−

OH

∣

C

H

−CH

3

K

2

Cr

2

O

7

CH

3

−

C

∣∣

O

−CH

3

(y)

(X) with molecular formula C

3

H

8

O is an alcohol. CH

3

−CH

2

−CH

2

−OH, propanol.

But since K

2

Cr

2

O

7

being a strong oxidising agent would oxidise 1° alcohol to carboxylic acid, which will give negative iodoform test, thus (X) has to be a 2° alcohol.

Acetone would give positive iodoform test.

Thus (B) is the correct answer.