Question

Given below are two statements:
Statement (I) : Aminobenzene and aniline are same organic compounds.
Statement (II) : Aminobenzene and aniline are different organic compounds.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both Statement I and Statement II are correct
• B. Statement I is correct but Statement II is incorrect
• C. Statement I is incorrect but Statement II is correct
• D. Both Statement I and Statement II are incorrect

Answer 1

The Correct Option is B

The problem presents two statements regarding the identity of "aminobenzene" and "aniline" and asks to determine which statement is correct.

Concept Used:

This question is based on the principles of organic chemical nomenclature, specifically concerning aromatic amines. Organic compounds often have both a common name, which is historically prevalent, and a systematic IUPAC (International Union of Pure and Applied Chemistry) name. Sometimes, the common name is so widely used that it is also accepted as the official IUPAC name. The key is to identify the chemical structures corresponding to both names.

Step-by-Step Solution:

Step 1: Define Aniline.

Aniline is the common name for the organic compound consisting of a phenyl group (\(-C_6H_5\)) bonded to an amino group (\(-NH_2\)). Its chemical formula is \(C_6H_5NH_2\). This name is widely accepted and used in both academia and industry. The structure is a benzene ring with an attached \( -NH_2 \) group.

Step 2: Define Aminobenzene.

Aminobenzene is the systematic IUPAC name for the same compound. The nomenclature rules are applied as follows:

• The parent hydrocarbon is benzene (\(C_6H_6\)).
• An amino group (\(-NH_2\)) is present as a substituent on the benzene ring.

According to IUPAC rules, when an \(-NH_2\) group is a substituent, the prefix "amino-" is used. Therefore, the systematic name is formed by adding this prefix to the parent name, resulting in "aminobenzene".

Step 3: Compare the two names.

Both "aniline" and "aminobenzene" refer to the exact same chemical structure: \(C_6H_5NH_2\). Aniline is the common name, which is also retained by IUPAC as a preferred name due to its extensive historical use. Aminobenzene is the formal, systematic IUPAC name.

Since both names describe the same single organic compound, the statement that they are the same is correct.

Step 4: Evaluate the given statements.

Statement (I): "Aminobenzene and aniline are same organic compounds."
This statement is true, as established in Step 3.

Statement (II): "Aminobenzene and aniline are different organic compounds."
This statement is false, as it contradicts the conclusion from Step 3.

Final Result:

Based on the analysis, Statement (I) is true and Statement (II) is false.

Therefore, Statement (I) is true but Statement (II) is false.