Optical Isomerism in Octahedral Coordination of Bidentate Ligands

Q.

What are the first $30$ elements?

Q. Which one of the following complexes will have four different isomers?

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

Q. Which of the following has an optical isomer?

1. $\left[Co\right(en\left)\right(N{H}_3{)}_2{]}^{2+}$
2. $\left[Co\right(H_{2}O{)}_4\left(en\right){]}^{3+}$
3. Cis$\left[Co\right(en{)}_2(N{H}_3{)}_2{]}^{3+}$
4. $\left[Co\right(N{H}_3{)}_{3}Cl{]}^{+}$

Q.

Consider the complex ions, trans-${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$ (A) and cis-${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$ (B). The correct statement regarding them is

1. Both (A) and (B) are optically active.

2. (A) can be optically active, but (B) cannot be optically active.

3. Both (A) and (B) cannot be optically active.

4. (A) cannot be optically active, (B) can be optically active.

Q.

How many geometrical isomers are possible in the following coordination entities?
(1). ${\left[Cr{\left(C_2{O}_4\right)}_3\right]}^{3-}$

(2). $\left[Co{\left(N{H}_3\right)}_{3}C{l}_3\right]$

Q. Primary , secondary and tertiary amines are 1) chain isomers 2)position isomers 3) functional isomers 4) Tautomers

Q. Which of the following is the symmetry operation of centre of symmetry?

1. Rotation
2. Inversion
3. Reflection
4. Both (a) and (b)

Q. The phenomenon of optical activity will be shown by:

1. 
2. 
3. 
4. All of the above

Q.

The following complexex are given:
(1) $trans-\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
(2) $cis-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$
(3) $trans-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$
(4) $[NiC{l}_4{]}^{2-}$
(5) $[Ti{F}_6{]}^{2-}$
(6) $[Co{F}_6{]}^{3-}$
Choose the correct code:

1. 4 is colored; 5, 6 are colorless

2. 4, 5 are colored; 6 is colorless

3. 2 is optically active; 1, 3 are optically inactive

4. 1, 2 are optically active; 3 optically inactive

Q. Which of the following is correct about $\text{tetraamminedithiocyanato-S-cobalt(III) tris(oxalato)cobaltate(III)}?$

1. Formula of complex is $\left[Co\right(SCN{)}_2\left(N{H}_3{)}_4\right]\left[Co\right(ox{)}_3]$
2. It is a chelating complex and show linkage isomerism
3. It show optical isomerism
4. It show geometrical isomerism

Q. Which one of the following is likely to show optical activity?

1. $Trans-\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
   
   
2. $\left[Co\right(H_{2}O{)}_{5}Cl{]}^{2+}$
3. $Cis-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$
4. $Trans-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$

Q. The number of geometrical isomers for square planar $[AuB{r}_{2}C{l}_2{]}^{-}$ and $\left[PtC{l}_2\right(en\left)\right]\text{are respectively:}$

1. $2,2$
2. $2,$ no isomerism
3. $3,2$
4. $3,$ no isomerism

Q. Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Why?

Q. Complex compound(s) of which optical activity does not depend upon the orientation of the ligands around metal cation.
(i) $\left[CoC{l}_3\right(N{H}_3{)}_3]$
(ii)$\left[Co\right(en{)}_3]C{l}_3$
(iii) $\left[Co\right(C_2{O}_4{)}_2(N{H}_3{)}_2{]}^{-}$

1. (i) and (iii)
2. (i), (ii)
3. only (ii)
4. (ii), (iii)

Q. The complexes $\left[Co\right(N{H}_3{)}_6\left]\right[Cr\left(CN{)}_6\right]$ and $\left[Cr\right(N{H}_3{)}_6\left]\right[Co\left(CN{)}_6\right]$ are the examples of which type of isomerism?

1. Linkage isomerism
2. Ionization isomerism
3. Coordination isomerism
4. Geometrical isomerism

Q. Which of the following has an optical isomer?

Q.

Draw the structures of optical isomers of:
${\left[Cr{\left(C_2{O}_4\right)}_3\right]}^{3-}$

${\left[PtC{l}_2\left(e{n}_2\right)\right]}^{2+}$

$\left[Cr{\left(N{H}_3\right)}_{2}C{l}_2\right(en){]}^{+}$

Q.

Which of the following complexes is not expected to exhibit optical isomerism ?

1. $\left[Co\right(en{)}_{2}C{l}_2{]}^{⨁}$

2. $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$

3. $\left[Co\right(en\left)\right(N{H}_3{)}_{2}C{l}_2{]}^{⨁}$

4. $\left[Co\right(en{)}_3{]}^{3+}$

Q. (a) How carboxylate ion get stabilised by resonance? Explain by the structure.
(b) Carboxylic acids are more acidic than phenols. Explain.

Q. For the given complex $\left[CoC{l}_2\right(en\left)\right(N{H}_3{)}_2{]}^{+}$, the number of geometrical isomers and the number of optical isomers respectively are:

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

Q.

Which of the following complexes is not expected to exhibit optical isomerism ?

1. $\left[Co\right(en{)}_{2}C{l}_2{]}^{⨁}$

2. $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$

3. $\left[Co\right(en\left)\right(N{H}_3{)}_{2}C{l}_2{]}^{⨁}$

4. $\left[Co\right(en{)}_3{]}^{3+}$

Q. Which of the following can have meso isomers?

1. $C{H}_2\left(OH\right)CH\left(OH\right)CHO$
2. $C{H}_2\left(OH\right)CH\left(OH\right)CH\left(OH\right)COOH$
3. $C{H}_2\left(OH\right)CH\left(OH\right)CH\left(OH\right)CHO$
4. $HOOCCH\left(OH\right)CH\left(OH\right)COOH$

Q. The number of optically active isomers in the compound $C{H}_{3}CH\left(OH\right)COOH$ is:

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

Q. Assertion :Statement $-$ 1 : Complexes containing three bidentate groups such as ${\left[Cr{\left(ox\right)}_3\right]}^{3-}$ and ${\left[Co{\left(en\right)}_3\right]}^{3+}$ do not show optical activity. Reason: Statement $-$ 2 : Octahedral complex, $\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]Cl$ shows geometrical isomerism.

1. Statement $-$ 1 is true, Statement $-$ 2 is true and Statement $-$ 2 is correct explanation for Statement $-$ 1.
2. Statement $-$ 1 is true, Statement $-$ 2 is true and Statement $-$ 2 is NOT the correct explanation for Statement $-$ 1.
3. Statement $-$ 1 is true, Statement $-$ 2 is false.
4. Statement $-$ 1 is false, Statement $-$ 2 is true.

Q. The optical isomers which are not mirror images of each other are called:

1. Diastereomers
2. Enantiomers
3. Mesomers
4. Metamers

Q.

Statement - 1: Complexes containing three bidentate ligands do not show optical activity.
Statement - 2: Octahedral complex $\left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl$ shows geometrical isomerism.

1. Statement - 1 is true, Statement - 2 is false

2. Statement - 1 is true, Statement - 2 is true; Statement - 2 is a correct explanation for statement - 1

3. Statement - 1 is true, Statement - 2 is true; Statement - 2 is NOT a correct explanation for Statement - 1

4. Statement - 1 is false, Statement - 2 is true

Q. Which optically active compound on reduction with $LiAl{H}_4$ will give optically inactive compound?

1. $C{H}_3-CH\left(OC{H}_3\right)-COOH$
2. $C{H}_3-C{H}_2-CH\left(OH\right)-COOH$
3. $C{H}_3-C{H}_2-CH\left(C{H}_{2}OH\right)-COOH$
4. $C{H}_3-CH\left(OH\right)-C{H}_2-COOH$

Q. Assume that configurations consisting of a completely filled or half filled set of $d$-orbitals is spherically symmetrical. The species having spherical symmetry are:

1. ${Cu}^{+}$
2. $Pd$
3. $Cr$
4. $Zn$

Q. Which of the following is not correct about $\text{tetraamminedithiocyanato-S-cobalt(III) tris(oxalato)cobaltate(III)}?$

1. Formula of complex is $\left[Co\right(SCN{)}_2\left(N{H}_3{)}_4\right]\left[Co\right(ox{)}_3]$
2. It is a chelating complex and show linkage isomerism
3. It show optical isomerism
4. It show geometrical isomerism

Q.

The following complexex are given:
(1) $trans-\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
(2) $cis-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$
(3) $trans-\left[Co\right(N{H}_3{)}_2(en{)}_2{]}^{3+}$
(4) $[NiC{l}_4{]}^{2-}$
(5) $[Ti{F}_6{]}^{2-}$
(6) $[Co{F}_6{]}^{3-}$
Choose the correct code:

1. 1, 2 are optically active; 3 optically inactive

2. 2 is optically active; 1, 3 are optically inactive

3. 4, 5 are colored; 6 is colorless

4. 4 is colored; 5, 6 are colorless