The ground state magnetic property of `B_(2) and C_(2)` molecules will be

Answer

A

Explanation

`B_(2):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(pi2p_(x))^(1)=(pi2p_(y))^(1)`
Two unpaired electrons and hence paramagnetic.
`C_(2):KK(sigma2s)^(2)(sigma^(**)2s)^(2)(pi2p_(x))^(2)=(pi2p_(y))^(2)`
No unpaired electron and hence diamagnetic.