Question

The reaction of ethene is the presence of $H^{+}$ can be example for:

• A. $-$I effect
• B. $+$E effect
• C. $-E$ effect
• D. $+$I effect

Answer 1

The correct option is B $+$E effect

The reaction of Ethene in the presence of $H^{+}$ can be an example for $+E$ effect. Complete transfer of multiple bonded electron takes lace towards attacking reagent(electrophile).
Note: When the electron pair moves towards the attacking reagent, it is termed as the $+E$ effect. The addition of acids to alkenes is an example of the $+E$ effect. After the transfer takes place, the reagent gets attached to the atom where the electrons have been transferred to.