Which are only Lewis acid but not Bronsted acid of CO_2, BCl_3, NH_3, CH_3NH_2, NO_2^+ and C_6H_5NH_3^+ ?

Which are only Lewis acid but not Bronsted acid of CO_2, BCl_3, NH_3,

1.	Which are only Lewis acid but not Bronsted acid of CO_2, BCl_3, NH_3, CH_3NH_2, NO_2^+ and C_6H_5NH_3^+ ?
Answer» SOLUTION :`CO_2 , BCl_3 , NO_2^+`