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I just want to confirm if the $\ce{R-Mg}$ bond is a covalent bond which undergoes heterolytic fission during reactions while the bond between magnesium and halogen atom is ionic. Am I right or wrong?

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    $\begingroup$ The R-magnesium bond in a Grignard reagent is polar covalent with carbon being the negative end of the dipole, which explains its nucleophilicity. And the magnesium-halogen bond is largely ionic. $\endgroup$ Sep 12 at 3:06
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    $\begingroup$ chemistry.stackexchange.com/questions/429/… $\endgroup$
    – Mithoron
    Sep 13 at 23:20
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Yes, you are correct. The carbon-magnesium bond in a Grignard reagent is polar covalent with carbon being the negative end of the dipole, which explains its nucleophilicity and the magnesium-halogen bond is largely ionic.

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