MCQ
In $NO_2$ molecule $N$ atom undergoes in
- A$sp^3$ hybridization
- ✓$sp^2$ hybridization
- C$sp$ hybridization
- D$sp^2d$ hybridization
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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