Question

Which of the following statements are correct?
I) $CO$ forms a complex with $CuCl$ in $con.HCl$
II) $Ni$ forms a volatile carbonyl compound with $CO$
III) $CO$ act as a lewis acid
(IV) $CO$ oxidizes $Cu$ to $CuO$

• A. I and III
• B. I and II
• C. III and IV
• D. I and IV

Answer 1

The correct option is B I and II

i) Correct. When $Cu\left(I\right)Cl$ is dissolved in conc. $HCl$, it absorbs $CO$ forming an adduct $CuCl\left(CO\right)$.

ii) Correct

$Ni+4CO\to Ni{\left(CO\right)}_4$

volatile

iii) Correct. $CO$ can act as a Lewis acid because $CO$ has a vacant ${\Pi }^{\ast }$ orbital (antibonding) that can accept electrons from an electron pair donor.

Ans. (A) and (B)