Among the following compounds, which one has the shortest $\mathrm{C}-\mathrm{C}\mathrm{l}$  bond?

<p><strong>Sol.</strong> <span class="mathml" contenteditable="false"> <math> <msup> <mrow> <mrow> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">r</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> <mo>+</mo> </mrow> </mrow> </msup> </math> </span> and <span class="mathml" contenteditable="false"> <math> <msup> <mrow> <mrow> <mi mathvariant="normal">F</mi> <mi mathvariant="normal">e</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> <mo>+</mo> </mrow> </mrow> </msup> </math> </span>&nbsp;both have 4 unpaired electrons.</p>

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