Which of the following is an electrophile ?
The correct option is D SO3
A reagent which donates an electron pair to an electron deficient centre is known as nucleophiles.
. .NH3, H−. .O. .−H, R−. .O. .−R∣∣ are nucleophiles as they have lone pair of electrons to donate.
A reagent which can accept an electron pair in a reaction, is called an electrophile.
SO3 has a vacant d-orbital. So, it can accept electron pair and hence act as electrophile (or lewis acid).