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STD 12 - 5. Co-ordination chemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. Co-ordination chemistry4 Marks
MCQ
The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: $Fe =26, Ni =28$ )

$(A)$ 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

  • A
    $A,B$
  • B
    $A,C$
  • ✓
    $B,C$
  • D
    $B,D$
✓

Answer

Correct option: C.
$B,C$
c
Total number of valence shell electrons at metal centre in $Fe ( CO )_5$ or $Ni ( CO )_4$ is $18$ . Metal carbonyl compounds are predominantly low spin in nature. Metal-Carbon bond strengthens when the oxidation state of the metal is lowered.

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