A) \[1\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[2.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1.24\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
E) \[0.9\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[{{r}_{cm}}=\frac{{{m}_{H}}\times {{r}_{H}}+{{m}_{Cl}}+{{r}_{Cl}}}{{{m}_{H}}+{{m}_{Cl}}}\] \[=\frac{{{m}_{H}}\times 0+35.5\,{{m}_{H}}+{{r}_{Cl}}}{{{m}_{H}}+{{m}_{Cl}}}\] \[=1.24{\AA}\] (from chlorine atom)
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