12 public questions tagged with this topic.
[Co(NH₃)4Cl₂]+ (octahedral, 6 ligands) shows cis and trans isomers.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number
[Co(NH₃)3Cl₃] (octahedral, [Ma₃b3]) can have a meridional (mer) isomer where 3 Cl− ligands are in a plane.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
[Ni(NH₃)2Cl₂] (square planar, [Ma₂b2]) has 2 NH₃ and 2 Cl−, allowing cis and trans isomers.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
[Fe(H₂O)4Cl₂]+ (octahedral, [Ma₄b2]) allows cis and trans isomers.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
[Co(NH₃)3(H₂O)3]3+ (octahedral, [Ma₃b3]) has fac and mer isomers.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
In the cis (facial) isomer, 3 Cl− are on one face, all adjacent.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
CH₃CH₂CH₂CH=CH₂ (pent-1-ene) has no geometrical isomerism. CH₃C(CH₃)=CHCH₃ (2-methylbut-2-ene) is a chain isomer, also lacking geometrical isomerism due to identical substituents.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
Geometrical isomerism requires a double bond with different substituents on each carbon. CH₃CH=CHCH₂CH₃ (pent-2-ene) can exist as cis or trans isomers.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
CH₂=CHCH₂CH₂CH₂CH₃ (hex-1-ene) has one double bond (degree = 1) and no geometrical isomerism due to identical substituents (H) on one carbon of the double bond.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
C₆H₁₂ can be hexene (e.g., CH₃CH₂CH₂CH=CHCH₃, hex-2-ene), which shows cis/trans isomerism. Hexene has three main structural isomers: hex-1-ene, hex-2-ene, hex-3-ene.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
Geometrical isomerism occurs in alkenes with different substituents on each carbon of the double bond. CH₃CH=CHCH₃ (but-2-ene) can exist as cis or trans isomers.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
CH₃CH₂CH=CHCH₃ (pent-2-ene) shows geometrical isomerism (cis/trans) due to different substituents on the double bond. It has no chain isomerism with itself, as it’s the same structure.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
