Among the following marked proton of which compound shows lowest \(pK_a\) value ?
The Correct Option is A
Approach Solution - 1
To determine which compound has the lowest \(pK_a\) value, we need to consider the acidity of the protons marked in each compound. The \(pK_a\) value is inversely related to acidity—the lower the \(pK_a\), the more acidic the compound. Here's the step-by-step reasoning:
- The acidity of a proton in a compound is significantly influenced by the stability of the conjugate base formed after the proton is removed. More stable conjugate bases correspond to more acidic protons.
- Electronegative atoms or electron-withdrawing groups near the proton can stabilize the conjugate base via resonance or inductive effects, resulting in a lower \(pK_a\) value.
- Evaluate each compound in the image options to identify which one has features that most stabilize the conjugate base:
Upon examination, the compound depicted in the above image (compound with the correct tagged proton in the provided list) has features that contribute to a highly stable conjugate base due to the presence of electronegative atoms or extensive resonance stabilization. Hence, it exhibits the lowest \(pK_a\) value among the given options.
Approach Solution -2
(A)
(B) 
(C) 
(D) 
The conjugate base of compound (C) is stabilized by extended conjugation.
Top Questions on Chemistry in Everyday Life
Given below are two statements:
Statement I: D-(+)-glucose + D-(+)-fructose $\xrightarrow{H_2O}$ sucrose sucrose $\xrightarrow{\text{Hydrolysis}}$ D-(+)-glucose + D-(+)-fructose
Statement II: Invert sugar is formed during sucrose hydrolysis.
In the light of the above statements, choose the correct answer from the options given below -- JEE Main - 2025
- Chemistry
- Chemistry in Everyday Life
- What is the pH of a 0.01 M solution of HCl?
- BITSAT - 2025
- Chemistry
- Chemistry in Everyday Life
- Arrange the following in the increasing order of oxidation number of nitrogen
A. N$_2$O
B. NO$_3^-$
C. NO
D. NO$_2$- TS EAMCET - 2025
- Chemistry
- Chemistry in Everyday Life
- Which of these separation technique pairs is correctly matched?
- AIIMS Paramedical - 2025
- Chemistry
- Chemistry in Everyday Life
- Which of the following is an example of antifertility drug?
- TS EAMCET - 2025
- Chemistry
- Chemistry in Everyday Life
Questions Asked in JEE Main exam
Two circular discs of radius \(10\) cm each are joined at their centres by a rod, as shown in the figure. The length of the rod is \(30\) cm and its mass is \(600\) g. The mass of each disc is also \(600\) g. If the applied torque between the two discs is \(43\times10^{-7}\) dyne·cm, then the angular acceleration of the system about the given axis \(AB\) is ________ rad s\(^{-2}\).
- JEE Main - 2026
- Rotational motion
- If \[ \frac{\tan(A-B)}{\tan A}+\frac{\sin^2 C}{\sin^2 A}=1, \quad A,B,C\in\left(0,\frac{\pi}{2}\right), \] then:
- JEE Main - 2026
- Trigonometry
Match the LIST-I with LIST-II for an isothermal process of an ideal gas system.
Choose the correct answer from the options given below:
- JEE Main - 2026
- Thermodynamics and Work Done
- A bag contains 10 balls out of which \( k \) are red and \( (10-k) \) are black, where \( 0 \le k \le 10 \). If three balls are drawn at random without replacement and all of them are found to be black, then the probability that the bag contains 1 red and 9 black balls is:
- JEE Main - 2026
- Probability
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
- JEE Main - 2026
- Organic Chemistry
Concepts Used:
Chemistry in Everyday Life
The scientific study of matter’s properties and behaviour is known as chemistry. It is a natural science that studies the elements that makeup matter, as well as the compounds, made up of atoms, molecules, and ions: their composition, structure, qualities, and behaviour, as well as the changes that occur when they mix with other things.
- Importance of Chemistry in Food - Chemicals are the fundamental components of everything. Chemical molecules make up all food, including carbs, vitamins, lipids, proteins, and fibre, which are all safe and often desirable.
- Importance of Chemistry in Medicines - Medicines or pharmaceuticals are chemical substances that are used to treat diseases and relieve pain. Chemistry has made significant contributions to health care. Chemistry, for example, aids in the manufacture and application of surgical materials.
- Importance of Chemistry in Cosmetics - In our daily lives, we use lotions, fragrances, talcum powder, and a variety of other cosmetic goods. All of these items are developed in laboratories using chemicals for our health and skin.
- Importance of Chemistry in Soaps and Detergents - Soaps are sodium and potassium salts of fatty acids with greater molecular weights, such as stearic acid, palmitic acid, and oleic acid. Sodium salts of long-chain alkyl hydrogen sulphates or sodium salts of long-chain alkyl benzene sulphonic acids are commonly used as detergents.