MCQ
A reaction involving two different reactants
- ACan never be a second order reaction
- ✓Can never be a unimolecular reaction
- CCan never be a bimolecular reaction
- DCan never be a first order reaction
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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
Statement $II :$ The lone pair of electrons on nitrogen in pyridine makes it basic.
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