Structural isomerism and stereoisomerism — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Geometrical isomerism in coordination compounds arises from

• A. different spatial arrangements of ligands around the same central metal
• B. different molecular formulae
• C. different numbers of atoms
• D. different oxidation states only

Question 2 · difficulty L2 · understanding

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and $$\mathrm{M}$$ is metal) involves $$\mathrm{sp}^3$$ hybridization. The number of geometrical isomers exhibited by the complex is :

• A. 0
• B. 2
• C. 3
• D. 4

Question 3 · difficulty L2 · understanding

Which of the following complex is homoleptic?

• A. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
• B. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$
• C. $\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$
• D. $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$

Question 4 · difficulty L2 · understanding

The ionisation isomer of $$\mathrm{[Cr(H_2O)_4Cl(NO_2)]Cl}$$ is

• A. $$[Cr{({H_2}O)_4}({O_2}N)]C{l_2}$$
• B. $$[Cr{({H_2}O)_4}C{l_2}](N{O_2})$$
• C. $$[Cr{({H_2}O)_4}Cl(ONO)]Cl$$
• D. $$[Cr{({H_2}O)_4}C{l_2}(N{O_2})]{H_2}O$$

Question 5 · difficulty L3 · understanding

X is the number of geometrical isomers exhibited by $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{BrCl}\right]$. Y is the number of optically inactive isomer(s) exhibited by $\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$ Z is the number of geometrical isomers exhibited by $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_2\right)_3\right]$. The value of $\mathrm{X}+\mathrm{Y}+\mathrm{Z}$ is $\_\_\_\_$ .

Question 6 · difficulty L3 · understanding

A metal complex with a formula $\mathrm{MCl}_4 \cdot 3 \mathrm{NH}_3$ is involved in $\mathrm{sp}^3 \mathrm{~d}^2$ hybridisation. It upon reaction with excess of $\mathrm{AgNO}_3$ solution gives ' $x$ ' moles of AgCl . Consider ' $x$ ' is equal to the number of lone pairs of electron present in central atom of $\mathrm{BrF}_5$. Then the number of geometrical isomers exhibited by the complex is _________.

Question 7 · difficulty L3 · understanding

The number of optical isomers exhibited by the iron complex $(\mathrm{A})$ obtained from the following reaction is___________. $$\mathrm{FeCl}_3+\mathrm{KOH}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightarrow \mathrm{~A}$$

Question 8 · difficulty L3 · understanding

Number of complexes which show optical isomerism among the following is ________. $$\text { cis- }\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-},\left[\mathrm{Co}(\text {en})_3\right]^{3+}, \text { cis- }\left[\mathrm{Pt}(\text {en})_2 \mathrm{Cl}_2\right]^{2+}, \text { cis- }\left[\mathrm{Co}(\text {en})_2 \mathrm{Cl}_2\right]^{+}, \text {trans- }\left[\mathrm{Pt}(\text {en})_2 \mathrm{Cl}_2\right]^{2+}, \text { trans- }\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-}$$

Question 9 · difficulty L3 · understanding

(a) CoCl 3 .4NH 3 , (b) CoCl 3 .5NH 3 , (c) CoCl 3 .6NH 3 and (d) CoCl(NO 3 ) 2 .5NH 3 . Number of complex(es) which will exist in cis-trans form is/are _______________.

Question 10 · difficulty L3 · understanding

The number of optical isomers possible for [Cr(C 2 O 4 ) 3 ] 3$$-$$ is ____________.