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Question

Identify A and B in the following reaction


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Solution

Step 1 :

  • This is a grignard reaction
  • THF is required for the production of the Grignard reagent. In the Grignard reagent, lone pair electrons of molecules create a complex with the magnesium. This combination aids in the stabilization of the organometallic and boosts its reactivity.
  • As we know, Mg exists as Mg2+and will attack chlorine due to the higher electron density of chlorine. As a result, this will be a displacement reaction.

C6H4BrCl→Mg/THFBrC6H4Mg+Cl-(a)

Step 2 :

  • The Grignard Reaction occurs when an organomagnesium halide (Grignard reagent) is added to a ketone or aldehyde to generate tertiary or secondary alcohol.
  • Magnesium chloride is substituted by aldehyde, resulting in the formation of alcohol.
  • The handing reagent that quenches the magnesium alkoxide product of the Grignard addition is ammonium chloride.

BrC6H4Mg+Cl-→(II)NH3Cl(i)CH3CHOBrC6H4C(OH)CH3(a)(b)

  • Hence overall reaction is:
The compound A is Magnesium chloride(MgCl2), and compound B is alcohol.


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