Which of the following order is wrong-

Options

A. `NH_3 lt PH_3 lt AsH_3` - acidic nature
B. `Li^(+) lt Na^(+) lt K^(+) lt Cs^(+)` - ionic radius
C. `Al_2O_3 lt MgO lt Na_2O lt K_2O` - basic
D. `Li lt Be lt B lt C` - 1st ionisation potential

Answer

D

Explanation

The ionization potential of `C, B, Be and Li`
`C = 1s^2 , 2s^2 2p^2`

`[C gt Be gt B gt Li]`.