Question

Which of the following compound/ion is/are having pyramidal geometry?

• A. ${Cl{O}_3}^{-}$
• B. $(Si{H}_3{)}_{3}N$
• C. $(C{H}_3{)}_{3}N$
• D. ${C{H}_3}^{+}$

Answer 1

Answer: (A), (C)

$(C{H}_3{)}_{3}N$
${Cl{O}_3}^{-}$

$Cl{O}_3^{-}$ contains one lone pair of electrons and $3$ bonding domains. Hence, it undergoes $s{p}^3$ hybridization and has
pyramidal geometry.
Similarly, trimethyl amine contains one lone pair of electrons and $3$ bonding domains. Hence, it undergoes $s{p}^3$
hybridization and has pyramidal geometry.