I2 dissolves much better in aqueous KI than in pure water because I2 + I- I3-. How many lone pairs are present on the central iodine atom of the linear triiodide ion?

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JEE Advanced levelSingle correct optionDifficulty 3 of 3ph048

$I X_{2}$ dissolves much better in aqueous $KI$ than in pure water because $I X_{2} + I X^{-} I X_{3} X^{-}$ . How many lone pairs are present on the central iodine atom of the linear triiodide ion?

Answer: C

Central I has 7 valence electrons + 1 for the negative charge = 8, and uses 2 in two I-I bonds, leaving 6 electrons = 3 lone pairs. The five electron pairs form a trigonal bipyramid, with the three lone pairs equatorial, giving a linear ion.

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IX2​ dissolves much better in aqueous KI than in pure water because IX2​+IX−​IX3​X−. How many lone pairs are present on the central iodine atom of the linear triiodide ion?

Answer: C

More questions on Trends in halogens

$I X_{2}$ dissolves much better in aqueous $KI$ than in pure water because $I X_{2} + I X^{-} I X_{3} X^{-}$ . How many lone pairs are present on the central iodine atom of the linear triiodide ion?