Question

How many different type of functional groups are present in following structure (Excluding C=C)

• A. 4
• B. 5
• C. 6
• D. 7

Answer 1

Answer: (B)

B

Answer 2

To determine the number of different types of functional groups in the given structure (excluding C=C bonds), we will systematically identify each functional group present and then count the unique types.

Let's examine the structure:

1. Amide (Primary): The group -C(=O)NH₂ is present at the top right of the central aromatic system. This is a primary amide.

   • Type: Amide

2. Amine (Secondary): The group -NHCH₃ is present at the top left of the central aromatic system. This is a secondary amine.

   • Type: Amine

3. Alcohol (Primary): The group -CH₂OH is present at the bottom left. This is a primary alcohol.

   • Type: Alcohol

4. Carboxylic Acid: The group -C(=O)OH is present at the bottom left, adjacent to the alcohol group.

   • Type: Carboxylic Acid

5. Ketone: The group -C(=O)CH₂CH₃ is present at the bottom right, attached to the central aromatic system. This is a ketone.

   • Type: Ketone

6. Side Chain: The chain CH₂-CH₂-C(=O)-CH₂-NH₂ is present on the far right.

   • Within this chain, the -C(=O)- group is a ketone. This is the same type as identified in point 5.
   • Within this chain, the -NH₂ group is a primary amine. This is the same type (Amine) as identified in point 2.

Now, let's list the unique types of functional groups identified:

1. Amide (from -C(=O)NH₂)
2. Amine (from -NHCH₃ and -CH₂NH₂)
3. Alcohol (from -CH₂OH)
4. Carboxylic Acid (from -C(=O)OH)
5. Ketone (from -C(=O)CH₂CH₃ and -CH₂CH₂C(=O)CH₂NH₂)

Counting these unique types, we find there are 5 different types of functional groups. The question explicitly excludes C=C bonds, so the aromatic rings themselves or any alkene bonds (if present) are not counted as functional groups.

The final answer is $\boxed{5}$.