Question

What is the electrometric reaction of water with alkyne?

Answer 1

Hint: As we know that the Electrons present in a pi bond can be polarized with little effect. So, when the charged reagents like electrophiles or nucleophiles approach them, the electrons get polarized and displaced towards one of the constituents of the atom.

Complete answer:
The mechanism involved is electrostatic attraction or repulsion. The atom that acquires the pair of electrons becomes negatively charged while the other atom gets a positive charge. Electromeric effect is a reversible reaction where there is a complete transfer of a pi-electron pair due to the influence of an electrophile or a nucleophile. The effect disappears upon withdrawal of the attacking reagent. The electromeric effect is also non-specific in terms of its direction which is always that which flavours the reaction. The electromeric effect is seen only when there is an electron attacking reagent and is also referred to as the E effect. Curved arrow notation is also used to show the movement of electrons from one site to another.
The mechanism of an electromeric reaction can be explained in the following manner. When a double or a triple bond is subjected to an attack by an electrophile (a reagent), the two pi electrons forming the pi bond are transferred to one atom or the other. The transfer of the shared pi electrons leads to the instantaneous formation of a dipole in the molecule.

Note:
Remember that neutrophils are electron acceptors and when they attack, the pi-electrons are shifted to the atom with a positive charge. This effect is depicted as positive E and can be represented by the chemical reaction.