Question

Zerevitinov�s determination of active hydrogen in a compound is based upon its reaction with

• A. Na
• B. ${CH_3MgI}$
• C. Zn
• D. Al

Answer 1

The Correct Option is B

The question asks about Zerevitinov’s method for determining active hydrogen in a compound and which reagent it is based on. To determine the active hydrogen in a compound, Zerevitinov’s method utilizes the reaction with organometallic compounds, specifically Grignard reagents. Let us analyze the given options to determine the correct answer:

• Option 1: Na - Sodium is a reactive metal and can react with many compounds containing hydrogen, but it is not the specific agent used in Zerevitinov’s determination method.
• Option 2: ${CH_3MgI}$ - This is a Grignard reagent, which is commonly used for measuring active hydrogen. Grignard reagents react with active hydrogen in various organic compounds, leading to the release of methane gas (CH₄), which can be quantitatively measured. This is the basis of Zerevitinov's method.
• Option 3: Zn - Zinc is mainly used in reactions like galvanization or some specific reductions, but not in the determination of active hydrogen as per Zerevitinov’s method.
• Option 4: Al - Aluminum has its uses in reducing reactions but is not relevant in the specific context of Zerevitinov’s active hydrogen determination.

Based on the analysis, ${CH_3MgI}$ is the correct answer. Grignard reagents are specifically used in this determination method because they efficiently react with active hydrogen to form new compounds and measurable gases like methane.

Conclusion: The correct answer is ${CH_3MgI}$, as it is the Grignard reagent used in Zerevitinov's method for determining active hydrogen.