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Statement I: Cis isomer of \([Co(en)_2Cl_2]Cl\) shows optical activity Statement II: Cis isomer of \([Co(en)_2Cl_2]Cl\) is a symmetrical |
Both Statement I and statement II are correct and statement II is the correct explanation of statement I Both Statement I and statement II are true but statement II is not the correct explanation for statement I Statement I is correct but Statement II is false Statement I is false but Statement II is correct |
Statement I is correct but Statement II is false |
The correct answer is option 3. Statement I is correct but Statement II is false. Let us break down the explanation for each statement regarding the cis isomer of \([Co(en)_2Cl_2]Cl\): To understand why this statement is true, let's delve into the concept of optical activity: Chirality and Optical Activity: A molecule is optically active if it can rotate the plane of polarized light. This occurs if the molecule is chiral, meaning it has a non-superimposable mirror image (enantiomers). Cis Isomer of \([Co(en)_2Cl_2]Cl\): In the cis isomer, the two ethylenediamine (en) ligands are adjacent to each other on the octahedral cobalt complex. This arrangement does not have a plane of symmetry, leading to chirality. Consequently, the cis isomer exists as a pair of enantiomers that can rotate plane-polarized light, making it optically active. Statement II: Cis isomer of \([Co(en)_2Cl_2]Cl\) is symmetrical To understand why this statement is false, consider the following: Symmetry and Chirality: A molecule is symmetrical if it can be divided into two identical halves by a plane. Symmetrical molecules are generally achiral (not optically active) because they have no enantiomers. Cis Isomer of \([Co(en)_2Cl_2]Cl\): The cis isomer has the two en ligands adjacent to each other, creating a specific 3D arrangement without a plane of symmetry. This lack of symmetry is what makes the molecule chiral and optically active. Therefore, saying the cis isomer is symmetrical is incorrect because its structure lacks a plane of symmetry. To summarize: Statement I is true because the cis isomer is chiral and shows optical activity. Statement II is false because the cis isomer is not symmetrical. Therefore, the correct option is: Statement I is correct but Statement II is false |
