Question

An _____ is a hydrocarbon in which one or more hydrogen atoms is replaced by a -COH group.

A. aldehyde
B. alcohol
C. ester
D. amino acid

Answer 1

Answer is A. Aldehyde (-CHO)
Esters (=O)
Alcohols (-OH)
Amino acids (-NH2COOH)

Answer 2

Answer : The correct option is, (A) Aldehyde

Explanation :

Alcohol group : It is the class of organic compound in which the hydroxy (-OH) group is attached to a hydrocarbon is known as alcohols.

The general representation of alcohol are,
`R-OH`.

For example :
`CH_3-CH_2-OH` is obtained when one hydrogen atom is replaced by
`-OH` group.

Amino acid : Amino acid are the acid that contains two functional groups which are carboxylic group,
`-COOH` and ammine group,
`-NH_2`.

The bond present between the two amino acid is a peptide bond. The peptide bond is formed between the nitrogen of one amino acid and carbon of another amino acid.

Ester group : It is the class of organic compound in which the
`-COO` group is attached to a hydrocarbon is known as ester.

The general formula of ester are,
`R-COO-R^'`. It is directly attached to the two alkyl group of carbon.

Aldehyde group : It is the class of organic compound in which the (-CHO) group is attached to a hydrocarbon is known as aldehyde.

The general representation of aldehyde are,
`R-CHO`.

For example :
`CH_3-CH_2-CHO` is obtained when one hydrogen atom is replaced by
`-CHO` group.

Hence, the correct option is, (A) Aldehyde