Question

A compound (X) with a molecular formula $\mathrm { C } _ { 5 } \mathrm { H } _ { 10 } \mathrm { O }$ gives a positive 2,4- DNP test but a negative Tollen’s test. On oxidation it gives a carboxylic acid (Y) with a molecular formula $\mathrm { C } _ { 3 } \mathrm { H } _ { 6 } \mathrm { O } _ { 2 }$ . Potassium salt of (Y) undergoes kolbe’s reaction and gives a hydrocarbon (Z) (X), (Y) and (Z). respectively are

• A. Pentan-3-one, propanoic acid, butane
• B. Pentanal, pentanoic acid, octane
• C. 2-methylbutanone, butanoic acid, hexane
• D. 2,2-dimethylropanone, propanoic acid, hexane

Answer 1

Answer: (A)

Pentan-3-one, propanoic acid, butane

Answer 2

: Since the compound gives positive 2,4- DNP

test and negative Tollens’ test, it is a ketone.