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The correct order of 1H NMR chemical shift (β) values for the labeled methyl groups in the following compound is:
  • a)
    Me1 < Me2 < Me3 < Me4
  • b)
    Me3 < Me4 < Me1 < Me2
  • c)
    Me3 < Me1 < Me4 < Me2
  • d)
    Me2 < Me4 < Me3 < Me1
Correct answer is option 'B'. Can you explain this answer?
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Here highest will be 2 because on congugation, o of ester gets positive and thus there is bond strengthening of ch bonds in 2.

in 1, hypervonjugation operates which is weaker than mesomeric/resonance
in 4 the methyl carbon is attached to sp2 carbon thus ectronegative character and strengthening the bond.

in 3it is simple methyl attached to sp3
carbon with no effect.


hope my explanation is satisfactory!
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The correct order of 1H NMR chemical shift (β) values for the labeled methyl groups in the following compound is:a)Me1 < Me2 < Me3 < Me4b)Me3 < Me4 < Me1 < Me2c)Me3 < Me1 < Me4 < Me2d)Me2 < Me4 < Me3 < Me1Correct answer is option 'B'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about The correct order of 1H NMR chemical shift (β) values for the labeled methyl groups in the following compound is:a)Me1 < Me2 < Me3 < Me4b)Me3 < Me4 < Me1 < Me2c)Me3 < Me1 < Me4 < Me2d)Me2 < Me4 < Me3 < Me1Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The correct order of 1H NMR chemical shift (β) values for the labeled methyl groups in the following compound is:a)Me1 < Me2 < Me3 < Me4b)Me3 < Me4 < Me1 < Me2c)Me3 < Me1 < Me4 < Me2d)Me2 < Me4 < Me3 < Me1Correct answer is option 'B'. Can you explain this answer?.
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