The Student Room Group

How do bonding pairs of electrons attack a carbonyl group?

I saw a mechanism where Et-MgBr's covalent bond has a curly arrow pointing towards the carbon in a carbonyl group. How can the bonding electron pair attack it? I am used to it only being the lone pairs. 😅
Bonding pairs attacking happens alot, you can search up the electrophilic addition mechanism. For example in ethene + hydrogen bromide the C=C bond uses one of its bonding pairs to attack the partially positive hydrogen atom on the H-Br. The H then goes to the ethene to make the intermediate and then the bromide ion attacks the now positive carbon atom to make bromoethane.

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