Q34 / 180 · COMEDK 2026 (9 May Shift 2) · Chemistry

The number of bond pairs and lone pairs of electrons in the molecule $\text{IF}_5$ is:

  • A
    $6, 0$
  • B
    $4, 1$
  • C
    $4, 2$
  • Correct answer
    D
    $5, 1$

Solution

The central atom in $\text{IF}_5$ is Iodine (I).

Number of valence electrons in Iodine = $7$.

Number of Fluorine atoms bonded to Iodine = $5$.

Each Fluorine atom forms a single bond with Iodine, so the number of bond pairs = $5$.

Number of valence electrons used in bonding = $5$.

Remaining valence electrons on Iodine = $7 - 5 = 2$.

Number of lone pairs = $\dfrac{2}{2} = 1$.

Thus, the molecule $\text{IF}_5$ has $5$ bond pairs and $1$ lone pair.

Answer: $5, 1$

Hence, the correct answer is option: 'D'.

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