Which is not true about metal carbonyls?

CHEMISTRY · Single correct · ISC · Chemistry · Chemical Bonding and Molecular Structure · Chemical Bonding and Molecular Structure

Problem

Which is not true about metal carbonyls? (1) Here CO acts as a Lewis base as well as Lewis acid (2) Here metal acts as Lewis base as well as Lewis acid (3) Here dπ−pπd\pi-p\pi back bonding takes place (4) Here pπ−pπp\pi-p\pi back bonding takes place

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