Assertion $(A)$: The first ionisation energy of $Be$ is greater than that of $B$.
Reason $(R)$: $2p$ orbital has lower energy than $2s$ orbital.
Reason $(R)$: $2p$ orbital has lower energy than $2s$ orbital.
- ABoth $A$ and $R$ are true and $R$ is a correct explanation for $A$.
- BBoth $A$ and $R$ are true but $R$ is not a correct explanation for $A$.
- C$A$ is true but $R$ is false.
- D$A$ is false but $R$ is true.
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