Question

Does ethyne undergoes electromeric effect

Answer 1

Electromeric effect: ... -E effect: When the pi electrons of the multiple bond are transferred to the atom to which the attacking reagent does not get attached is called the negativeelectromeric effect. For example in R2 --C==O when an electrophile is added, it forms R2--C(+)==O(-).

Answer 2

alpha-hydrogen atom and keto-enol tautomerism. ... Thus, acetophenone, butan-2-one and propionaldehyde all contain α- hydrogen atoms and hence show keto-enol tautomerism. In contrast, benzaldehyde, benzophenone etc. do not contain α-hydrogen atoms.