Q. The alkane from below having two secondary hydrogens is :
A) 4-Ethyl-3,4-dimethyloctane
B) 2,2,3,3-Tetramethylpentane
C) 2,2,4,5-Tetramethylheptane
D) 2,2,4,4-Tetramethylhexane
Explanation
[Solution by Dr. Abubacker] Secondary hydrogens are on CH₂ groups. 2,2,3,3-Tetramethylpentane, (CH₃)₃C–C(CH₃)₂–CH₂CH₃, has a single CH₂ (2 secondary H). The other options contain two or more CH₂ groups, i.e. 4 or more secondary hydrogens. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.