JEE Main · 2019 · Shift-IImediumPB12-106

The correct statement about ICl5 and ICl4- is:

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

The correct statement about $\mathrm{ICl_5}$ and $\mathrm{ICl_4^-}$ is:

Options

a
$\mathrm{ICl_5}$ is trigonal bipyramidal and $\mathrm{ICl_4^-}$ is tetrahedral.
b
Both are isostructural.
c
$\mathrm{ICl_5}$ is square pyramidal and $\mathrm{ICl_4^-}$ is tetrahedral.
d
$\mathrm{ICl_5}$ is square pyramidal and $\mathrm{ICl_4^-}$ is square planar.
✓

Correct Answerd

$\mathrm{ICl_5}$ is square pyramidal and $\mathrm{ICl_4^-}$ is square planar.

Detailed Solution

$\mathrm{ICl_5}$ : I has 5 bond pairs + 1 lone pair = 6 electron pairs → $\mathrm{sp^3d^2}$ → square pyramidal geometry

$\mathrm{ICl_4^-}$ : I has 4 bond pairs + 2 lone pairs = 6 electron pairs → $\mathrm{sp^3d^2}$ → square planar geometry (lone pairs occupy axial positions)

Answer: Option (4) — $\mathrm{ICl_5}$ is square pyramidal and $\mathrm{ICl_4^-}$ is square planar

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