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Chemistry Question 64 – JEE-MAIN 2025

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Match the LIST-I with LIST-II LIST-ILIST-IIA. CarbocationI. Species that can supply a pair of electrons.B. C-Free radicalII. Species that can receive a pair of electrons.C. NucleophileIII. sp2 hybridized carbon with empty p-orbital.D. ElectrophileIV. sp3 hybridized carbon with one unpaired electron. Choose the \textit{correct} answer from the options given below:

Understand the fundamental definitions and characteristics of carbocations, free radicals, nucleophiles, and electrophiles in organic chemistry.

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Ninja Strategy•Definition-based Matching

Start by matching the most distinct definitions or structural features (e.g., carbocation's empty p-orbital or nucleophile's electron donation) to quickly eliminate incorrect options.

Step 1: Match Carbocation and Free Radical Structures✦ Active

A carbocation (A) is a carbon atom with a positive charge, typically sp2 hybridized, and possesses an empty p-orbital. This directly matches List-II item III. A C-free radical (B) is a carbon atom with an unpaired electron. List-II item IV describes an sp3 hybridized carbon with one unpaired electron, which is characteristic of a free radical. Thus, A → III and B → IV.

Step 2: Match Nucleophile and Electrophile Definitions○ Expand

A nucleophile (C) is an electron-rich species that donates a pair of electrons to form a new bond. This matches List-II item I. An electrophile (D) is an electron-deficient species that accepts a pair of electrons to form a new bond. This matches List-II item II. Thus, C → I and D → II.

Step 3: Compile the Final Match and Select Option○ Expand

Combining the matches from Step 1 and Step 2, we get: A-III, B-IV, C-I, D-II. Comparing this with the given options, option 4 is the correct match.

💡 Teacher's Secret Hint

Ensure you distinguish between the structural description of an intermediate and the functional definition of a reagent.

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