`SO_2` acts as a Lewis acid as well as Lewis base. How?

SOCl_(2) can act as Lewis acid as well as Lewis base because

Which of the following species acts as a Lewis acid and also as a Lewis base ?

Any species capable of accepting a lone pair of electrons acts as a lewis acid, where as a species capable of donating a proton acts as a Bronstead acid. Which of the following can act as a lewis acid as well as a lewis base ?

What are Lewis acids?

Which of the following can act as Lowry-Bronsted acid as well as base?

Which of the following can act as Lowry -Bronsted acid as well as base?

Why does NH_(3) act as a Lewis base ?

Any species capable of accepting a lone pair of electrons acts as a lewis acid, where as a species capable of donating a proton acts as a Bronstead acid. Which of the following is not a lewis acid ?