Which reaction forms a product with a trigonal planar geometry?

# Which reaction forms a product with a trigonal planar geometry?

1. A

${\mathrm{N}}_{2}+3{\mathrm{H}}_{2}\to$

2. B

$2\mathrm{CO}+{\mathrm{O}}_{2}\to$

3. C

${\mathrm{PCl}}_{3}+{\mathrm{Cl}}_{2}\to$

4. D

$2{\mathrm{SO}}_{2}+{\mathrm{O}}_{2}\to$

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### Solution:

In all the given reaction it is observed that the ${\mathrm{so}}_{3}$ has the structure of trigonal planner and all the other molecule has the other structure.

(a)${\mathrm{N}}_{2}+3{\mathrm{H}}_{2}\to 2{\mathrm{NH}}_{3}$ (Pyramidal)

(b) $2\mathrm{CO}+{\mathrm{O}}_{2}\to 2{\mathrm{CO}}_{2}$ (Linear)

(c) ${\mathrm{PCl}}_{3}+{\mathrm{Cl}}_{2}\to {\mathrm{PCl}}_{5}$ (TBP)

(d) $2{\mathrm{SO}}_{2}+{\mathrm{O}}_{2}\to 2{\mathrm{SO}}_{3}$ (Trigonal planar)

Sulfur trioxide is known to be a sulfuric acid anhydride. The trigonal planar structure of ${\mathrm{SO}}_{3}$has a bond angle of ${120}^{0}$. The triangular planar molecule ${\mathrm{SO}}_{3}$ in the gas phase requires ${\mathrm{sp}}^{2}$ hybridization of the S atom.

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