Introduction to Geometric Isomerism

Q. What is coordinate number and how to find coordinate number of any particular compound

Q. Number of the geometrical isomers for the molecule are:

1. 2
2. 4
3. 8
4. 6

Q.

Which of the following has maximum number of geometrical isomers ?

1. $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]$

2. $\left[\mathrm{Ni}\left({\mathrm{C}}_2{\mathrm{O}}_4\right){\left(\mathrm{en}\right)}_2\right]$

3. ${\left[\mathrm{Cr}{\left(\mathrm{SCN}\right)}_2{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$

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

1. $C{N}^{-}>B{r}^{-}>C_6{H}_5^{-}>N{H}_3$
2. $B{r}^{-}>C{N}^{-}>N{H}_3>C_6{H}_5^{-}$
3. $C{N}^{-}>C_6{H}_5^{-}>B{r}^{-}>C_6{H}_5^{-}$
4. $N{H}_3>C{N}^{-}>B{r}^{-}>C_6{H}_5^{-}$

Q.

how many nearest and next nearest neighbours respectively each potassium has in BCC lattice

Q. Which one of the following shows geometrical isomerism : $CHCl=CHCl,C{H}_2=CC{l}_2,andCC{l}_2=CHCl.$

1. $CHCl=CHCl$
2. $C{H}_2=CC{l}_2$
3. $CC{l}_2=CHCl$
4. None of the above

Q. Isomerism that arises out of the difference in spatial arrangement of atoms or groups about the doubly bonded carbon atoms are called?

1. Geometrical Isomerism
   
2. Structural Isomerism
   
3. Position Isomerism
   
4. None of the above

Q.

The correct structures $\mathrm{trans}-\left[{\mathrm{NiBr}}_2{\left({\mathrm{PPh}}_3\right)}_2\right]$ and $\mathrm{meridional}-\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$ respectively are:

1. 

2. 

3. 

4. 

Q. Geometrical isomerism is possible in case of -
a) Pent-2-ene
b) Ethene
c) Butane
d) Hex-3-ene

1. a, c
2. b, c
3. a, d
4. a, b

Q.

Which of the following has a square pyramidal shape?

1. ${\mathrm{XeOF}}_2$

2. ${\mathrm{XeO}}_3{\mathrm{F}}_2$

3. ${\mathrm{XeOF}}_4$

4. ${\mathrm{XeO}}_2{\mathrm{F}}_2$

Q.

Match the complexes in Column-I with their properties listed in Column-II

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{(a)}& \left[Co\right(N{H}_3{)}_4\left(H_{2}O{)}_2\right]C{l}_2& \text{(p)}& \text{Geometrical isomers}\\ \text{(b)}& \left[Pt\right(N{H}_3{)}_{2}C{l}_2]& \text{(q)}& \text{Paramagnetic}\\ \text{(c)}& \left[Co\right(H_{2}O{)}_{5}Cl]Cl& \text{(r)}& \text{Diamagnetic}\\ \text{(d)}& \left[Ni\right(H_{2}O{)}_6]C{l}_2& \text{(s)}& \text{Metal ion with + 2 oxidation state}\end{array}$

1. (A-p, q, s) (B-p, r, s) (C-q, s) (D-q, s)

2. (A-p, q, s) (B-p, q, s) (C-r, s) (D-q, s)

3. (A-p, q, s) (B-p, q, s) (C-r, s) (D-r, s)

4. (A-p, q, r) (B-p, r, s) (C-q, s) (D-q, s)

Q. The complex ion which shows geometrical isomerism is

1. $\left[\mathrm{Cr}\right(H_{2}O{)}_4{\mathrm{Cl}}_2{]}^{+}$
2. $\left[\mathrm{Pt}\right({\mathrm{NH}}_3{)}_3\mathrm{Cl}]$
3. $\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_6{]}^{3+}$
4. $\left[\mathrm{Co}\right(\mathrm{CN}{)}_5\left(\mathrm{NC}\right){]}^{3–}$

Q.

Which one of the following compounds shows optical isomerism

1. 

2. 

3. 

4. 

Q. Which of the following does not show geometrical isomerism?

1. $CClBr=CBrCl$
2. $C{H}_{3}CCl=CC{H}_{3}Cl$
3. (a) and (b) above.
4. $CC{l}_2=CC{l}_2$

Q. Which of the following statement is true regarding cis and trans-2-butenes?

1. cis-2-butene and trans-2-butene isomers have the same structure and same arrangement of atoms or groups in space
2. Trans-alkenes and cis-alkene are generally equal in stability
3. cis-2-butene are generally more stable than trans-2-butene due to less steric crowding.
4. cis-2-butene and trans-2-butene isomers have the same structure and different arrangement of atoms or groups in space

Q. (a) What type of isomerism is shown by the complex $\left[Co\right(N{H}_3{)}_5\left(SCN\right){]}^{2+}$?
(b) Why is $[NiC{l}_4{]}^{2-}$ paramagnetic while $\left[Ni\right(CN{)}_4{]}^{2-}$ is diamagnetic? (Atomic number of Ni = 28)
(c) Why are low spin tetrahedral complexes rarely observed?

Q. Predict the number of stereoisomers (optical isomers) in $OHC{H}_2(CHOH{)}_{4}CHO.$

1. 16
2. 8
3. 4
4. 2

Q. Geometrical isomerism is found in coordination compounds having metal with coordination number:

1. 2
2. 3
3. 4 (tetrahedral)
4. 6

Q. The compound (s) that exhibit(s) geometrical isomerism is (are)

1. $\left[Pt\right(en\left)C{l}_2\right]$
2. $\left[Pt\right(en{)}_2]C{l}_2$
3. $\left[Pt\right(N{H}_3{)}_{2}C{l}_2\left)\right]$
4. $\left[Pt\right(en{)}_{2}C{l}_2]C{l}_2$

Q. For the given complex ${\left[Co{Cl}_2\right(en\left){\left({NH}_3\right)}_2\right]}^{+}$, the number of geometrical isomers, the number of optical isomers and total number of isomers of all type possible respectively are:

1. $2,2$ and $4$
2. $2,2$ and $3$
3. $2,0$ and $2$
4. $0,2$ and $2$

Q. MgFe2O4 has spinel structure, then the percentage of tetrahedral voids and the octahedral voids occupied are respectively

Q. In the nomenclature of coordination compounds if both the cation and anion are coordination entities and both have central atom ion then it is necessary that they should have same charge or they can have different charge also?

Q. The total number of geometrical isomers possible for an octahedral complex of the type $\left[M{A}_2{B}_2{C}_2\right]$ is:

1. $3$
2. $4$
3. $5$
4. $6$

Q. The number of geometrical isomers in the following compound is:
$C{H}_3-CH=CH-CH=CH-C_2{H}_5$

1. 3
2. 2
3. 5
4. 4

Q. How many geometrical isomers are possible in the following coordination entities?
$\left[Co{\left({NH}_3\right)}_3{Cl}_3\right]$

Q. Which of the following compounds will exhibit geometrical isomerism?

1. 1-phenyl-2-butene
2. 1, 1-diphenyl-1-propene
3. 2-phenyl-1-butene
4. 3-phenyl-1--butene

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral centre is not the sufficient criterion for optical activity. The ultimate criterion is the presence or absence of either plane or centre of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereoisomers of the compounds. Those words are diastereomers and mesomers.

1. $C{H}_3-C{H}_2-CH\left(Cl\right)-C{H}_2-C{H}_3$
2. $C{H}_3-C{H}_2-CD\left(Cl\right)-C{H}_2-C{H}_3$
3. $C{H}_3-C{H}_2-CH\left(D\right)-C{H}_2-C{H}_3$
4. $C{H}_3-C{H}_2-CH\left(D\right)-C{H}_3$

Q. Define the cis-trans isomerism? Show the cis-trans isomers of $\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$:

Q.

For tetrahedral coordination number, the radius ratio

[KCET 2000]

1. 
   

2. 
   

3. 
   

4. 
   

Q. The number of geometrical isomers that can exist for square planar $\left[Pt\right(Cl\left)\right(py\left)\right(N{H}_3\left)\right(N{H}_{2}OH){]}^{+}$ is (py$=$ pyridine.)

1. $6$
2. $2$
3. $3$
4. $4$