Which of the following substances is used as an antiknock compound?
- ALead tetrachloride
- BLead acetate
- CZinc ethyl
- DTetraethyl lead $(TEL)$
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$A$. Total number of valence shell electrons at metal centre in $Fe(CO)_5$ or $Ni(CO)_4$ is $16$
$B$. These are predominantly low spin in nature
$C$. Metal-carbon bond strengthens when the oxidation state of the metal is lowered
$D$. The carbonyl $C-O$ bond weakens when the oxidation state of the metal is increased
MediumIIT 2018
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