Nomenclature, Isomerism, Importance and Werner's Theory

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JEE Main 2026

LEVELJEE Advanced

Consider that the coordinating atoms of the ligands in $c i s - [C o (N H_{3})_{4} C l_{2}] C l$ and $m er - [C o (N H_{3})_{3} C l_{3}]$ octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is ____.

JEE Advanced 2026

LEVELJEE Advanced

The total number of all possible isomers for the square planar complex with formula $K [M (N C S) (N O_{2}) (g l y)]$ is ______ ( $M =$ metal ion and $g l y = N H_{2} C H_{2} C O O^{-}$ )

JEE Advanced 2019

LEVELJEE Main

Total number of $c i s$ $N - Mn - Cl$ bond angles (that is, $Mn - N$ and $Mn - Cl$ bonds in $c i s$ positions) present in a molecule of $c i s - [Mn (en)_{2} Cl_{2}]$ complex is ____ ( $en = NH_{2} CH_{2} CH_{2} NH_{2}$ )

JEE Advanced 2016

LEVELJEE Advanced

The number of geometric isomers possible for the complex $[CoL_{2} Cl_{2}]^{-}$ ( $L = H_{2} NCH_{2} CH_{2} O^{-}$ ) is

JEE Advanced 2023

LEVELJEE Advanced

The complex(es), which can exhibit the type of isomerism shown by $[P t (N H_{3})_{2} B r_{2}]$ , is(are) $[e n = H_{2} N C H_{2} C H_{2} N H_{2}]$

* Multiple Correct Options

(A)

[P t (e n) (S C N)_{2}]

(B)

[Z n (N H_{3})_{2} C l_{2}]

(C)

[P t (N H_{3})_{2} C l_{4}]

(D)

[C r (e n)_{2} (H_{2} O) (S O_{4})]^{+}

JEE Advanced 2021

LEVELJEE Advanced

The total number of possible isomers for $[Pt (NH_{3})_{4} Cl_{2}] Br_{2}$ is ______ .

JEE Advanced 2018

LEVELJEE Advanced

The correct option(s) regarding the complex $[C o (e n) (N H_{3})_{3} (H_{2} O)]^{3 +}$ :- $(e n = H_{2} N C H_{2} C H_{2} N H_{2})$ is (are)

* Multiple Correct Options

(A)

It has two geometrical isomers

(B)

It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands

(C)

It is paramagnetic

(D)

It absorbs light at longer wavelength as compared to

[C o (e n) (N H_{3})_{4}]^{3 +}

JEE Advanced 2014

LEVELJEE Main

Match each coordination compound in List-I with an appropriate pair of characteristics from List-II and select the correct answer using the code given below the lists. ${en = H_{2} NCH_{2} CH_{2} NH_{2}; atomic numbers ; Ti = 22; Cr = 24; Co = 27; Pt = 78}$

List-I

(P)

[C r (N H_{3})_{4} C l_{2}] C l

(Q)

[T i (H_{2} O)_{5} C l] (N O_{3})_{2}

(R)

[P t (e n) (N H_{3}) C l] N O_{3}

(S)

[C o (N H_{3})_{4} (N O_{3})_{2}] N O_{3}

List-II

(1)

Paramagnetic and exhibits ionisation isomerism

(2)

Diamagnetic and exhibits cis-trans isomerism

(3)

Paramagnetic and exhibits cis-trans isomerism

(4)

Diamagnetic and exhibits ionisation isomerism

JEE Advanced 2015

LEVELJEE Main

In the complex acetylbromidodicarbonylbis(triethylphosphine)iron(II), the number of Fe–C bond(s) is-

JEE Advanced 2015

LEVELJEE Main

Among the complex ions, $[Co (NH_{2} - CH_{2} - CH_{2} - NH_{2})_{2} Cl_{2}]^{+}$ , $[CrCl_{2} (C_{2} O_{4})_{2}]^{3 -}$ , $[Fe (H_{2} O)_{4} (OH)_{2}]^{+}$ , $[Fe (NH_{3})_{2} (CN)_{4}]^{-}$ , $[Co (NH_{2} - CH_{2} - CH_{2} - NH_{2})_{2} (NH_{3}) Cl]^{2 +}$ and $[Co (NH_{3})_{4} (H_{2} O) Cl]^{2 +}$ , the number of complex ion(s) that show(s) cis-trans isomerism is -

JEE Main 2021

LEVELJEE Main

Match the List-I with List-II. $List-I (A) Chlorophyll (B) Vitamin-B_{12} (C) Anticancer drug (D) Grubbs catalyst List-II (i) Ruthenium (ii) Platinum (iii) Cobalt (iv) Magnesium$ Choose the most appropriate answer from the options given below:

(A)

A-(iii), B-(ii), C-(iv), D-(i)

(B)

A-(iv), B-(iii), C-(ii), D-(i)

(C)

A-(iv), B-(iii), C-(i), D-(ii)

(D)

A-(iv), B-(ii), C-(iii), D-(i)

JEE Main 2021

LEVELJEE Main

3 moles of metal complex with formula $Co(en)_{2} Cl_{3}$ gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is ............. . (Round off to the nearest integer)

JEE Main 2021

LEVELJEE Main

The stepwise formation of $[C u (N H_{3})_{4}]^{2 +}$ is given below $C u^{2 +} + N H_{3} K_{1} [C u (N H_{3})]^{2 +}$ $[C u (N H_{3})]^{2 +} + N H_{3} K_{2} [C u (N H_{3})_{2}]^{2 +}$ $[C u (N H_{3})_{2}]^{2 +} + N H_{3} K_{3} [C u (N H_{3})_{3}]^{2 +}$ $[C u (N H_{3})_{3}]^{2 +} + N H_{3} K_{4} [C u (N H_{3})_{4}]^{2 +}$ The value of stability constants $K_{1}, K_{2}, K_{3}$ and $K_{4}$ are $1 0^{4}, 1.58 \times 1 0^{3}, 5 \times 1 0^{2}$ and $1 0^{2}$ respectively. The overall equilibrium constants for dissociation of $[C u (N H_{3})_{4}]^{2 +}$ is $x \times 1 0^{- 12}$ . The value of $x$ is ........ . (Rounded off to the nearest integer)

JEE Main 2021

LEVELJEE Main

The denticity of an organic ligand, biuret is

The species that can have a trans-isomer is (en = ethane -1, 2-diamine, ox = oxalate)

(A)

[P t (e n) C l_{2}]

(B)

[C r (e n)_{2} (o x)]^{+}

(C)

[P t (e n)_{2} C l_{2}]^{2 +}

(D)

[Z n (e n) C l_{2}]

JEE Main 2020

LEVELJEE Main

Consider the complex ions, trans-[Co(en)2Cl2]+ (A) and cis-[Co(en)2Cl2]+ (B). The correct statement regarding them is

(A)

both (A) and (B) cannot be optically active

(B)

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

(C)

both (A) and (B) can be optically active

(D)

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

JEE Main 2015

LEVELJEE Main

The number of geometric isomers that can exist for square planar $[P t (C l) (p y) (N H_{3}) (N H_{2} O H)]^{+}$ is (py = pyridine)

Which one of the following complexes is violet in colour?

(A)

[F e (C N)_{6}]^{4 -}

(B)

[F e (S C N)_{6}]^{4 -}

(C)

F e_{4} [F e (C N)_{6}]_{3} \cdot H_{2} O

(D)

[F e (C N)_{5} N O S]^{4 -}

LEVELBoard

In the coordination compound, $K_{4} [N i (C N)_{4}]$ the oxidation state of nickel is

(A)

- 1

(B)

0

(C)

+ 1

(D)

+ 2

JEE Main 2019

LEVELJEE Main

Wilkinson catalyst is

(A)

[(E t_{3} P)_{3} R h C l]

(B)

[(E t_{3} P)_{3} I r C l] (E t = C_{2} H_{5})

(C)

[(P h_{3} P)_{3} R h C l]

(D)

[(P h_{3} P)_{3} I r C l]

JEE Main 2016

LEVELJEE Main

Which one of the following complexes shows optical isomerism?

(A)

cis [Co (en)_{2} Cl_{2}] Cl

(B)

trans [Co (en)_{2} Cl_{2}] Cl

(C)

[Co (NH_{3})_{4} Cl_{2}] Cl

(D)

[Co (NH_{3})_{3} Cl_{3}]

JEE Main 2021

LEVELJEE Main

The secondary valency and the number of hydrogen bonded water molecules in $CuSO_{4} \cdot 5 H_{2} O$ , respectively, are

The number of optical isomers possible for $[C r (C_{2} O_{4})_{3}]^{3 -}$ is ...

JEE Main 2021

LEVELJEE Main

Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula $CrCl_{3} \cdot 3 NH_{3} \cdot 3 H_{2} O$ reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is ……… .

JEE Main 2021

LEVELJEE Main

The number of geometrical isomers possible in triamminetrinitrocobalt (III) is $X$ and in trioxalatochromate (III) is $Y$ . Then, the value of $X + Y$ is ............... .

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of all possible isomers for the square planar complex with formula K[M(NCS)(NO2​)(gly)] is ______ (M= metal ion and gly=NH2​CH2​COO−)

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of geometric isomers possible for the complex [CoL2​Cl2​]− (L=H2​NCH2​CH2​O−) is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The complex(es), which can exhibit the type of isomerism shown by [Pt(NH3​)2​Br2​], is(are) [en=H2​NCH2​CH2​NH2​]

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of possible isomers for [Pt(NH3​)4​Cl2​]Br2​ is ______ .

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct option(s) regarding the complex [Co(en)(NH3​)3​(H2​O)]3+ :- (en=H2​NCH2​CH2​NH2​) is (are)

List-I

List-II

In the complex acetylbromidodicarbonylbis(triethylphosphine)iron(II), the number of Fe–C bond(s) is-

The denticity of an organic ligand, biuret is

The species that can have a trans-isomer is (en = ethane -1, 2-diamine, ox = oxalate)

Consider the complex ions, trans-[Co(en)2Cl2]+ (A) and cis-[Co(en)2Cl2]+ (B). The correct statement regarding them is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of geometric isomers that can exist for square planar [Pt(Cl)(py)(NH3​)(NH2​OH)]+ is (py = pyridine)

Which one of the following complexes is violet in colour?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In the coordination compound, K4​[Ni(CN)4​] the oxidation state of nickel is

Wilkinson catalyst is

Which one of the following complexes shows optical isomerism?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The secondary valency and the number of hydrogen bonded water molecules in CuSO4​⋅5H2​O, respectively, are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of optical isomers possible for [Cr(C2​O4​)3​]3− is ...

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate (III) is Y. Then, the value of X+Y is ............... .

The total number of all possible isomers for the square planar complex with formula $K [M (N C S) (N O_{2}) (g l y)]$ is ______ ( $M =$ metal ion and $g l y = N H_{2} C H_{2} C O O^{-}$ )

The number of geometric isomers possible for the complex $[CoL_{2} Cl_{2}]^{-}$ ( $L = H_{2} NCH_{2} CH_{2} O^{-}$ ) is

The complex(es), which can exhibit the type of isomerism shown by $[P t (N H_{3})_{2} B r_{2}]$ , is(are) $[e n = H_{2} N C H_{2} C H_{2} N H_{2}]$

The total number of possible isomers for $[Pt (NH_{3})_{4} Cl_{2}] Br_{2}$ is ______ .

The correct option(s) regarding the complex $[C o (e n) (N H_{3})_{3} (H_{2} O)]^{3 +}$ :- $(e n = H_{2} N C H_{2} C H_{2} N H_{2})$ is (are)

The number of geometric isomers that can exist for square planar $[P t (C l) (p y) (N H_{3}) (N H_{2} O H)]^{+}$ is (py = pyridine)

In the coordination compound, $K_{4} [N i (C N)_{4}]$ the oxidation state of nickel is

The secondary valency and the number of hydrogen bonded water molecules in $CuSO_{4} \cdot 5 H_{2} O$ , respectively, are

The number of optical isomers possible for $[C r (C_{2} O_{4})_{3}]^{3 -}$ is ...

The number of geometrical isomers possible in triamminetrinitrocobalt (III) is $X$ and in trioxalatochromate (III) is $Y$ . Then, the value of $X + Y$ is ............... .