Question

Which of the following species is an electrophile?

• A. $RN{H}_2$
• B. $S{O}_3$
• C. $\stackrel{-}{N}{O}_2$
• D. $ROH$

Answer 1

The correct option is B $S{O}_3$

Electrophiles are electron loving compounds or attacking reagents.
$S{O}_3$ acts as electrophile due to presence of vacant orbital in Suphur atom. Rest other are nucleophile as they have electron to donate.