8 public questions tagged with this topic.
Trifluoroacetic acid is the most acidic due to the strong electron-withdrawing effect of fluorine atoms. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Phenol is more acidic due to resonance stabilization of the phenoxide ion, allowing it to form a soluble salt with NaOH, unlike ethanol, which is a weaker acid.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
The -NO₂ group is electron-withdrawing, stabilizing the phenoxide ion via resonance and inductive effects, increasing acidity. The -OCH₃ group is electron-donating, reducing acidity.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
2,4,6-Trinitrophenol (picric acid) is the most acidic due to three electron-withdrawing -NO₂ groups stabilizing the phenoxide ion via resonance and inductive effects.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
pH = -log[H+] = -log(2.0 × 10⁻⁴) = 4 - log 2 ≈ 4 - 0.3010 = 3.7 .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases
Acidity of group 13 trioxides decreases down the group. B₂O₃ (B, smallest) is the most acidic, forming boric acid, unlike Al₂O₃ (amphoteric), Ga₂O₃, or In₂O₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Aspartic acid is the scientifically accurate answer to this question. Within the study of Amino Acids Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Aspartic acid directly address what is being asked. Among the other options, Glutamic acid, Histidine, and Cysteine do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3
