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JEE Main Chemistry General Organic Chemistry 2026 JEE Main 2026 (21 January Shift 2)

JEE Main Chemistry Question (2026) — Solution

Question

Match List - I with List - II. array l List - I & List - II \\ Pair of Compounds & Type of Isomers \\ A. 2-Methylpropene and but-1-ene & I. Stereoisomers \\ B. Cis-but-2-ene and trans-but-2-ene & II. Position isomers \\ C. 2-Butanol and diethyl ether & III. Chain isomers \\ D. But-1-ene and but-2-ene & IV. Functional group isomers array Choose the correct answer from the options given below :

Options

  1. A. A-II, B-I, C-IV, D-III
  2. B. A-III, B-I, C-II, D-IV
  3. C. A-I, B-IV, C-III, D-II
  4. D. A-III, B-I, C-IV, D-II

Answer

D. A-III, B-I, C-IV, D-II

Step-by-step solution

Analyzing the pairs of compounds in List-I: A. 2-Methylpropene (CH_3-C(CH_3)=CH_2) and but-1-ene (CH_3-CH_2-CH=CH_2) have the same molecular formula C_4H_8 but different carbon skeletons (branched vs straight chain). Thus, they are chain isomers. (A-III) B. Cis-but-2-ene and trans-but-2-ene are geometrical isomers, which fall under the category of stereoisomers. (B-I) C. 2-Butanol (C_4H_9OH) and diethyl ether (C_2H_5-O-C_2H_5) have the same molecular formula C_4H_ 10 O but different functional groups (alcohol vs ether). Thus, they are functional group isomers. (C-IV) D. But-1-ene and but-2-ene have the same carbon chain and functional group but differ in the position of the double bond (at C_1 vs C_2). Thus, they are position isomers. (D-II) Matching the pairs: A-III, B-I, C-IV, D-II.

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