Tautomerism NEET MCQ - NEET Practice Questions with Answers

Tautomers are isomers of a compound which differ only in the position of the protons and electrons. The carbon skeleton of the compound is unchanged. A reaction which involves simple proton transfer in an intramolecular fashion is called tautomerism.

The decreasing -I effect or increasing +I effect order is as follows:
–NH₃⁺ > –NO₂ > –SO₂R > –CN > –SO₃H > –CHO > –CO > –COOH > -F > –COCl > -CONH₂ > –Cl > –Br > –I > –OR > -OH > -NR₂ > –NH₂ > –C₆H₅ > –CH=CH₂ > –H

In hyperconjugation, more is the number of -carbons, more is the number of hyperconjugated structures and thus more is the stability. Thus, stability follows the given order:
3^o carbocation > 2^o carbocation > 1^o carbocation

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