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JEE MAIN Chemistry QUESTION #1016
Question 1
The alkane from below having exactly two secondary hydrogens is:
  • 4-Ethyl-3,4-dimethyloctane
  • 2,2,3,3-Tetramethylpentane✔️
  • 2,2,4,5-Tetramethylheptane
  • 2,2,4,4-Tetramethylhexane
Correct Answer Explanation
In 2,2,3,3-tetramethylpentane: \(\text{CH}_3\text{C(CH}_3)_2\text{-C(CH}_3)_2\text{-CH}_2\text{CH}_3\). The \(\text{-CH}_2\text{-}\) group has 2 secondary H atoms and the terminal \(\text{CH}_3\) of ethyl has... carefully counting only secondary carbons (bonded to exactly 2 carbons): 2,2,3,3-tetramethylpentane has exactly 2 secondary H atoms.