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Question

Which of the following is/are the correct characteristics of anionic part of 'X'?
[Polar and non-polar nature to be considered on the basis of dipole moment]
(I) Planar
(II) non-planar
(III) Polar
(IV) non-polar


A
I and III
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B
I and IV
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C
II and III
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D
II and IV
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Solution

The correct option is B I and IV
When $$KI$$ and $$I_2$$ reacts, it forms $$I_3^-$$

$$KI+I_2 \rightarrow K^++I^-_3$$

So, the species $$X$$ formed is $$I_3^-$$.

It undergoes $$sp^{3}d$$ hybridization with linear geometry.

The anionic part of X that is $$I^-$$ is planar and non-polar.
Because all the lone pair and the bonded atoms with the central atom lie on the same plane. The anionic part is non-polar because the electronegativity difference between the bonded adjacent atom is Zero. Consequently, dipole moment is zero.

Hence, $$I$$ & $$IV$$ are correct.

Chemistry

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