Based on the compounds of group 15 elements, the correct statement(s) is (are)

A

$$Bi_{2}O_{5}$$ is more basic than $$N_{2}O_{5}$$

B

$$NF_{3}$$ is more covalent than $$BF_{3}$$

C

$$PH_{3}$$ boils at lower temperature than $$NH_{3}$$

D

The N−N single bond is stronger than the P−P single bond