Three organic compounds A, B and C have the following molecular formulae :
A C4H8O2
B C4H10O
C C4H8O
(a) Which compound contains an alcohol group ? Write its name and structural formula.
(b) Which compound contains a carboxyl group ? Write its name and structural formula.
(c) Which molecular formula can represent an aldehyde as well as a ketone ? Write the names and structural formulae of the aldehyde and ketone represented by this molecular formula.
Lakhmir Singh Chemistry Class 10
Answers
Answer:
a) Among the given options above, the compound having an alcohol group is option B)C4H10O. The name is Butanol. Alcohol group has 'OH' group at the end attached to the carbon atom. The structural formula of Butanol is CH3CH2CH2CH2OH.
b) Among the given options above, the compound having a carboxyl group is option A)C4H802. The name is Butanoic acid. Acid or carboxyl group has 'COOH' group at the end attached to the carbon atom. The structural formula of Butanoic acid is CH3CH2CH2COOH.
c) Among the given options above, the compound having an aldehyde as well as ketone group is option C) C4H8O. The name is Butanal for aldehyde and Butanone for ketone. Aldehyde has CHO group and Ketone has C=O group. The structural formula of Butanal is CH3CH2CH2CHO and the structural formula of Ketone is CH3COCH2CH3.