Answer
Please see the work below.
Work Step by Step
We know that isoelectronic substances have the same number of valence electrons
that is $NH_4^+\space and CH_4$
$CO_2\space N_2$
$C_6H_6\space and B_3N_3H_6$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.