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STD 11 - 8.2 Organic chemistry isomerism — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 8.2 Organic chemistry isomerism4 Marks
Question
Correct stability order of the given tautomers is
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Answer

$(d)\, 1^{st}$ structure is unstable due to Bredt's rule.

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