The correct increasing order of trans-effect of the following species is:

1.  ${\mathrm{NH}}_3>{\mathrm{CN}}^{-}>\mathrm{Br}>{\mathrm{C}}_6{\mathrm{H}}_5^{-}$

2.  ${\mathrm{CN}}^{-}>{\mathrm{C}}_6{\mathrm{H}}_5^{-}>{\mathrm{Br}}^{-}>{\mathrm{NH}}_3$

3.  ${\mathrm{Br}}^{-}>{\mathrm{CN}}^{-}>{\mathrm{NH}}_3>{\mathrm{C}}_6{{\mathrm{H}}^{-}}_5$

4.  ${\mathrm{CN}}^{-}>{\mathrm{Br}}^{-}>{\mathrm{C}}_6{{\mathrm{H}}^{-}}_5>{\mathrm{NH}}_3$

Iron carbonyl, $\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$, is classified as:

Which of the following has the longest C ­—O bond length? (Free C—O bond length in CO is 1.128 Å)

The number of possible isomers for the complex $\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]Cl$ will be (en=ethylenediamine):

1. 2

2. 1

3. 3

4. 4

The hybridization involved in the complex ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$is:
(Atomic number of Ni=28)

1. $ds{p}^2$

2. $s{p}^3$

3. $d^{2}s{p}^2$

4. $d^{2}s{p}^3$

An ion, among the following, that has a magnetic moment of 2.84 BM is:
(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. Ni²⁺
2. Ti³⁺
3. Cr²⁺
4. Co²⁺

Cobalt(III) chloride forms several octahedral complexes with ammonia.
A compound among the following that does not give a test for chloride ions with silver nitrate at 25 °C is:

An anticancer agent among the following is:

1. $\mathrm{mer}-\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_3\mathrm{Cl}]$

2. c$\mathrm{is}-\left[{\mathrm{PtCl}}_2\right({\mathrm{NH}}_3{)}_2]$

3. c$\mathrm{is}-{\mathrm{K}}_2[\mathrm{Pt}$ ${\mathrm{Cl}}_2{\mathrm{Br}}_2]$

4. ${\mathrm{NH}}_2{\mathrm{CoCl}}_4$