Consider the species $\ce{CH4}$, $\ce{NH4+}$ and $\ce{BH4-}$. Choose the correct option with respect to these species:

(B) They are isoelectronic and all have tetrahedral structures

(A) They are isoelectronic and only two have tetrahedral structures

(C) Only two are isoelectronic and all have tetrahedral structures

(D) Only two are isoelectronic and only two have tetrahedral structures

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Chemical Bonding and Molecular Structure

Consider the species

CH X_{4}

NH X_{4} X^{+}

and

BH X_{4} X^{-}

. Choose the correct option with respect to these species:

Answer: (B)

All three species are isoelectronic with 10 electrons each:

CH X_{4}

(6+4=10),

NH X_{4} X^{+}

(7+4-1=10), and

BH X_{4} X^{-}

(5+4+1=10). Each species has 4 bonding pairs and no lone pairs on the central atom, resulting in tetrahedral geometry for all three.

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Single correct option