Question:

Given below are two statements :
Statement I : Sulphanilic acid gives esterification test for carboxyl group
Statement II : Sulphanilic acid gives red colour in Lassigne's test for extra element detection In the light of the above statements, choose the most appropriate answer from the options given below :

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Know the functional groups present in organic compounds and the tests used to detect them. Lassaigne’s test is used for elemental analysis of organic compounds.

Updated On: Mar 21, 2025

Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Statement I is incorrect but Statement II is correct
Statement I is correct but Statement II is incorrect

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The Correct Option is C

Solution and Explanation

Step 1: Analyze Statement I
Sulfanilic acid contains an amine group (\(-\text{NH}_2\)) which is attached to the benzene ring, and a sulfonic acid group (\(-\text{SO}_3\text{H}\)). It does not contain a carboxyl group (\(-\text{COOH}\)). Esterification is a characteristic reaction of carboxylic acids. Therefore, Statement I is incorrect.
Step 2: Analyze Statement II
Lassaigne's test is used to detect the presence of nitrogen, sulfur, halogens, and phosphorus in organic compounds. Sulfanilic acid contains sulfur and nitrogen. The red color in Lassaigne's test is due to the formation of ferric thiocyanate \([\text{Fe(SCN)}_3]\) when sulfur is present. Thus, Statement II is correct.

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Concepts Used:

Chemical Kinetics

Chemical kinetics is the description of the rate of a chemical reaction. This is the rate at which the reactants are transformed into products. This may take place by abiotic or by biological systems, such as microbial metabolism.

Rate of a Chemical Reaction:

The speed of a reaction or the rate of a reaction can be defined as the change in concentration of a reactant or product in unit time. To be more specific, it can be expressed in terms of: (i) the rate of decrease in the concentration of any one of the reactants, or (ii) the rate of increase in concentration of any one of the products. Consider a hypothetical reaction, assuming that the volume of the system remains constant. R → P

Read More: Chemical Kinetics MCQ

Factors Affecting The Reaction Rate:

The concentration of Reactants - According to collision theory, which is discussed later, reactant molecules collide with each other to form products.
Nature of the Reactants - The reaction rate also depends on the types of substances that are reacting.
Physical State of Reactants - The physical state of a reactant whether it is solid, liquid, or gas can greatly affect the rate of change.
Surface Area of Reactants - When two or more reactants are in the same phase of fluid, their particles collide more often than when either or both are in the solid phase or when they are in a heterogeneous mixture. In a heterogeneous medium, the collision between the particles occurs at an interface between phases. Compared to the homogeneous case, the number of collisions between reactants per unit time is significantly reduced, and so is the reaction rate.
Temperature - If the temperature is increased, the number of collisions between reactant molecules per second. Increases, thereby increasing the rate of the reaction.
Effect Of Solvent - The nature of the solvent also depends on the reaction rate of the solute particles.
Catalyst - Catalysts alter the rate of the reaction by changing the reaction mechanism.