Select the correct statement(s)

Options

A. `HOOC-CH_(2)-NH-underset(CH_(3))underset(|)overset(O)overset(||)C-CH-NH_(2)` is a dipeptide of Glycine & alanine, whose abbreviated name is GLY-ALA
B. Compound show Keto-enol tautomerism
C. Phenol & benzoic acid can be distinguished by `NaHCO_(3)`
D. Order of basicity in aquaous medium `MeNH_(2)ltMe_(2)NHltMe_(3)N`

Answer

To solve the question of selecting the correct statements, we will analyze each statement one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Analyzing Statement A**:
- The statement claims that the given compound is a dipeptide of glycine and alanine, abbreviated as GLYALA.
- **Structures**:
- Glycine: NH2-CH2-COOH
- Alanine: NH2-CH(CH3)-COOH
- **Formation of Dipeptide**:
- When forming a dipeptide, we combine glycine and alanine by removing a water molecule (H2O).
- The resulting structure will be: NH2-CH2-C(=O)-NH-CH(CH3)-COOH.
- **Conclusion**: This statement is correct.

2. **Analyzing Statement B**:
- The statement claims that the compound shows keto-enol tautomerism.
- **Keto-Enol Tautomerism**:
- This involves the interconversion between a keto form (with a carbonyl group) and an enol form (with a hydroxyl group and a double bond).
- The video describes the resonance structure showing the keto form converting to the enol form.
- **Conclusion**: This statement is correct.

3. **Analyzing Statement C**:
- The statement claims that phenol and benzoic acid can be distinguished by NaHCO3.
- **Reaction with NaHCO3**:
- Benzoic acid reacts with NaHCO3 to release CO2 gas, while phenol does not.
- **Conclusion**: This statement is correct.

4. **Analyzing Statement D**:
- The statement discusses the order of basicity of amines in aqueous medium.
- **Basicity Order**:
- The order of basicity is generally: 2° amine > 1° amine > 3° amine > NH3.
- The video mentions the order as NHMe2 (2°) > NH2Me (1°) > NMe3 (3°) > NH3.
- **Conclusion**: This statement is correct.

### Final Conclusion:
All statements A, B, C, and D are correct. Therefore, the correct answer for this question is A, B, C, and D.

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