Qualitative Organic Analysis

To determine the structure of the organic compound with the molecular formula , we need to analyze the given spectral characteristics and correlate them with the structural features shown in the options.

Step-by-Step Analysis:

1. Identify key spectral features:
   • H NMR:
   • IR:
2. Analyze each spectral feature:
   • The IR peak at suggests the presence of a carbonyl group, typical of aldehydes or esters.
   • In the H NMR:
     • indicates a hydrogen on a carbon adjacent to a carbonyl group (aldehydic proton).
     • and suggest aromatic protons, likely parasubstituted, as there are two sets of doublets.
     • suggests a methoxy group (—OCH₃).
     • indicates a methylene group (—CH₂—) possibly next to an electronegative atom (like an oxygen in an ether, or part of an ester).
3. Determine the most probable structure based on the above analysis:
   • Considering all the features, the compound is likely an aromatic ester with a methoxy group and a para-substitution pattern. The aldehyde proton at and the aromatic protons suggest a para-methoxy benzaldehyde structure.
4. Matching this analysis with the options provided, the structure in the corresponding option is consistent with the discussed features.

Conclusion:

The structure that matches all observed spectral data is identified in the option depicted by the following image:

To solve this question, we need to determine the products of the reaction between 2,4-dinitrofluorobenzene and hydrazine.

Step 1: Understanding the Reaction

2,4-dinitrofluorobenzene is a compound with strong electron-withdrawing nitro groups at the 2 and 4 positions on a benzene ring, which activates the fluorine for nucleophilic substitution.

Upon reaction with hydrazine (NH₂NH₂), the nucleophilic nitrogen on the hydrazine attacks the carbon with the fluorine, displacing the fluoride ion. This reaction is characteristic and leads to the formation of a hydrazone linkage.

Step 2: Identifying the Yellow Orange Solid X

The product of this reaction is known to be a 2,4-dinitrophenylhydrazone, a yellow-orange solid. This compound, referred to as X in the question, is known for its intense coloration, which is used in chemical analysis.

Step 3: Determining the Functional Group G

The functional group that 2,4-dinitrophenylhydrazone helps identify is the carbonyl group (C=O), commonly found in aldehydes and ketones. This is because hydrazone derivatives form selectively when carbonyl compounds react with hydrazine derivatives.

In the context of this reaction, hydrazines are typical reagents for testing carbonyl functionalities, and the formation of 2,4-dinitrophenylhydrazone derivatives confirms the presence of such a group.

Conclusion

Thus, the compounds X and G are identified as 2,4-dinitrophenylhydrazone and carbonyl group, respectively.

In the first reaction, the amine group undergoes nitrosation with nitrous acid (HNO) resulting in the formation of an unstable intermediate, which leads to the product X, an amine group (MeNH) attached to the carbon chain.

In the second reaction, the same nitrosation process is carried out, but since the structure has an-OH group, the nitrosation leads to the formation of Y, a hydroxyl group (MeOH)

The correct option is (A) :