Tautomerism is not exhibited by

Question

Tautomerism is not exhibited by (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Essential condition to show keto-enol tautomerism is the presence of D-hydrogen atom but hydrogen atom bonded to sp2 hybridized C-atom (i.e. unsaturated carbon atom) is difficult to ionise. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/d86f27f5e97c3fea8b20717b61e77ce3-.png" /> Hence does not show tautomerism.

Q. Tautomerism is not exhibited by

Essential condition to show keto-enol tautomerism is the
presence of $D$ -hydrogen atom but hydrogen atom bonded to $s p^{2}$
hybridized $C$ -atom (i.e. unsaturated carbon atom) is difficult to
ionise.

Hence does not show tautomerism.

Q. Tautomerism is not exhibited by

Essential condition to show keto-enol tautomerism is the presence of D-hydrogen atom but hydrogen atom bonded to sp2 hybridized C-atom (i.e. unsaturated carbon atom) is difficult to ionise. Hence does not show tautomerism.

Essential condition to show keto-enol tautomerism is the
presence of $D$ -hydrogen atom but hydrogen atom bonded to $s p^{2}$
hybridized $C$ -atom (i.e. unsaturated carbon atom) is difficult to
ionise.

Hence does not show tautomerism.