Question 69

The group(s) in which all are not having triangular planar structures is/are

Solution

$$\text{BF}_3$$, $$\text{BCl}_3$$, $$\text{SO}_3$$, $$\text{CO}_3^{2-}$$ and $$\text{NO}_3^-$$ are trigonal planar ($$sp^2$$, no lone pair). $$\text{NF}_3$$, $$\text{NH}_3$$ and $$\text{NCl}_3$$ have a lone pair on N and are trigonal pyramidal. So groups a, c and d each contain a non-planar species, while in group b all are planar. Hence options a, c and d are correct.

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