The group having triangular planar structure is:

1. ${\mathrm{BF}}_3,\mathrm{ }{\mathrm{NF}}_3,\mathrm{ }{\mathrm{CO}}_3^{2-}$
2. ${\mathrm{CO}}_3^{2-},\mathrm{ }{\mathrm{NO}}_3^{-},\mathrm{ }{\mathrm{SO}}_3$
3. ${\mathrm{NH}}_3,\mathrm{ }{\mathrm{SO}}_3, {\mathrm{CO}}_3^{2-}$
4. ${\mathrm{NCl}}_3,\mathrm{ }{\mathrm{BCl}}_3,\mathrm{ }{\mathrm{SO}}_3$

Solution

${\mathrm{CO}}_3^{-2},\mathrm{ }{\mathrm{NO}}_3^{-},\mathrm{ }{\mathrm{SO}}_3:\mathrm{plane} \mathrm{triangular} \mathrm{shape}$.   Central atom in all these three species is sp² hybridized, without any lone pairs on the central atom.

Asked in: JEE Main 2017 (09 Apr Online)

Practice more Chemical Bonding and Molecular Structure questions on Aicharya