MCQ
The product ‘$B$’ is


- A

- B

- ✓

- D







Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Note: py $=$ pyridine
Given: Atomic numbers of $Fe , Co , Ni$ and $Cu$ are $26,27,28$ and $29$ , respectively)
$(A)$ $\left[ FeCl _4\right]^{-}$and $\left[ Fe ( CO )_4\right]^{2-}$
$(B)$ $\left[ Co ( CO )_4\right]^{-}$and $\left[ CoCl _4\right]^{2-}$
$(C)$ $\left[ Ni ( CO )_4\right]$ and $\left[ Ni ( CN )_4\right]^{2-}$
$(D)$ $\left[ Cu ( py )_4\right]^{+}$and $\left[ Cu ( CN )_4\right]^{3-}$
$(a)$ $PhCOOH$
$(B)$ $o-NO_2C_6H_4COOH$
$(C)$ $p-NO_2C_6H_4COOH$
$(D)$ $m-NO_2C_6H_4COOH$