Which of the following is wrong .
A. The maximum covalency of Boron is 4 where as that of Al is 6 .
B. The order of EN of IIIA group elements is `B gt Al lt Ga lt In lt TI`
C. Down the group the oxidising power increases .
D. The ordder of acidic nature :
`N_(2)O_(3) gt P_(2) O_(3) gt As_(2) O_(3) gt Sb_(2)O_(3) gt Bi_(2)O_(3)`
