JEE MAIN - Chemistry (2023 - 1st February Evening Shift - No. 1)
$$\mathrm{O}-\mathrm{O}$$ bond length in $$\mathrm{H}_{2} \mathrm{O}_{2}$$ is $$\underline{\mathrm{X}}$$ than the $$\mathrm{O}-\mathrm{O}$$ bond length in $$\mathrm{F}_{2} \mathrm{O}_{2}$$. The $$\mathrm{O}-\mathrm{H}$$ bond length in $$\mathrm{H}_{2} \mathrm{O}_{2}$$ is $$\underline{Y}$$ than that of the $$\mathrm{O}-\mathrm{F}$$ bond in $$\mathrm{F}_{2} \mathrm{O}_{2}$$.
Choose the correct option for $$\underline{X}$$ and $$\underline{Y}$$ from those given below :
$$\mathrm{X}$$ - shorter, $$\mathrm{Y}$$ - longer
$$\mathrm{X}$$ - longer, $$\mathrm{Y}$$ - shorter
$$\mathrm{X}$$ - shorter, $$\mathrm{Y}$$ - shorter
$$\mathrm{X}$$ - longer, $$\mathrm{Y}$$ - longer
Explanation
| Bond | Bond Length |
|---|---|
| O - O | $1.48 \,\mathop A\limits^o\left(\text { In }{\mathrm{H}_2 \mathrm{O}_2}\right)$ |
| O - O | $1.22 \,\mathop A\limits^o\left(\text { In }{\mathrm{O}_2 \mathrm{F}_2}\right)$ |
Thus, $\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{H}_2 \mathrm{O}_2$ is longer than $\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{O}_2 \mathrm{~F}_2$.
| Bond | Bond Length |
|---|---|
| O - F | $158 \,\mathrm{pm}\left(\text { In }{\mathrm{O}_2 \mathrm{F}_2}\right)$ |
| O - H | $95 \,\mathrm{pm}\left(\text { In }{\mathrm{H}_2 \mathrm{O}_2}\right)$ |
Thus, the $\mathrm{O}-\mathrm{H}$ bond length in $\mathrm{H}_2 \mathrm{O}_2$ is shorter than $\mathrm{O}-\mathrm{F}$ bond length in $\mathrm{O}_2 \mathrm{~F}_2$.
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