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JEE Main 202623 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
23 January
Shift
Evening Shift
Subject
Chemistry
Chapter
General Organic Chemistry

JEE Main 2026 · 23 January · Evening Shift · Chemistry · General Organic Chemistry

Given below are two statements: Statement I : (CH_ 3 )_ 3 C is more...

Given below are two statements:
Statement I: (CH3)3C⊕\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}} is more stable than C⊕H3\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3} as nine hyperconjugation interactions are possible in \left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}.<br><b>StatementII</b>:.<br> <b>Statement II</b>:\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}islessstablethan(CH3)3C⊕is less stable than \left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}} as only three hyperconjugation interactions are possible in C⊕H3\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}.
In the light of the above statements, choose the correct answer from the options given below

Options

  1. AStatement I is false but Statement II is true
  2. BStatement I is true but Statement II is false
  3. CBoth Statement I and Statement II are true
  4. DBoth Statement I and Statement II are false

Correct answer

B. Statement I is true but Statement II is false

Step-by-step solution

Statement I: In the tert-butyl carbocation (CH3)3C+(CH_3)_3C^+, there are three methyl groups attached to the carbocationic carbon. Each methyl group has 3 α\alpha-hydrogens, making a total of 9 α\alpha-hydrogens. Thus, 9 hyperconjugation interactions are possible, which significantly stabilize the carbocation. Statement I is true.
Statement II: In the methyl carbocation CH3+CH_3^+, there are no α\alpha-carbons and consequently no α\alpha-hydrogens. Hyperconjugation requires the presence of at least one α\alpha-hydrogen on a carbon adjacent to the sp2sp^2 hybridized carbocation center. Therefore, zero hyperconjugation interactions are possible in CH3+CH_3^+. Statement II is false because it claims three hyperconjugation interactions are possible.
Conclusion: Statement I is true but Statement II is false.
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