Question

What is the name of a compound possessing $\left( { - CHO} \right)$ functional group?
A. Alcohol.
B. Aldehyde.
C. Ketone.
D. Amide.

Answer 1

We see about the functional group.
Functional group:
Functional group is an atom or a group of atoms which determine the characteristic property of the organic compounds in spite of the size of molecule members of the same functional group undergo the identical chemical reaction.

Complete step by step answer: Let we see the functional group in detail.
We know that a functional group may be a specific group of atoms or bonds with a compound that is liable for the characteristic chemical reactions of that compound and the molecules with the same functional group undergo similar reactions. Functional group plays a major role in the nomenclature of an organic compound.
The atoms in the functional group are linked together and to the compound through covalent bonds. We must know that an alpha carbon is the first carbon atom that attaches with the functional group and the second carbon is called beta carbon. Depending on the attached carbon functional groups are mentioned as primary, secondary and tertiary carbon atoms.
Now, we see about an alcohol functional group.
An organic compound which contains a hydroxyl group with the central carbon atom is called an Alcohol group.

$R-OH$

Therefore, option A is incorrect.
Now, we discuss an amide functional group.
An amide functional group contains nitrogen atom attached to a carbonyl carbon atom

Therefore, option D is incorrect.
Now, let us discuss an aldehyde functional group.
An organic compound which contains carbonyl group with the central carbon atom bonded to hydrogen and alkyl group is called an Aldehyde group.

Therefore, option B is correct.
We also remember that the ketone group differs from the Aldehyde group by the presence of hydrogen atoms. Ketones do not have hydrogen atoms.

Therefore, option C is incorrect.
So, the correct answer is “Option B”.

Note: We also know that an organic compound may contain more than one functional group. To identify the functional group we must know their formula.
Example: The formula for hydroxyl functional group is and the functional group for the acidic group is.