Coordination Compounds 1 Question 9

9. Which one of the following complexes shows optical isomerism?

(2016 Main )

(a) cis $\left[Co(en) _2 Cl _2\right] Cl$

(b) trans $\left[Co(en) _2 Cl _2\right] Cl$

(c) $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$

(d) $\left[Co\left(NH _3\right) _3 Cl _3\right]$

Show Answer

Answer:

Correct Answer: 9. (a)

Solution:

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-260_jpg_height_304_width_488_top_left_y_1438_top_left_x_410.jpg"width="300">

$\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ can exist in both cis and trans forms that are given below:

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-260_jpg_height_261_width_307_top_left_y_1815_top_left_x_386.jpg"width="200">

trans- $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ (optically inactive)

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-260_jpg_height_256_width_304_top_left_y_1818_top_left_x_752.jpg"width="200">

cis- $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ (optically inactive)

$\left[Co\left(NH _3\right) _3 Cl _3\right]$ exists in fac and mer-isomeric forms and both are optically inactive.

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-260_jpg_height_232_width_250_top_left_y_2249_top_left_x_403.jpg"width="200">

fac-isomer (optically inactive)

<img src=“https://temp-public-img-folder.s3.amazonaws.com/sathee.prutor.images/sathee_image/cropped_2024_01_16_b4fdca9f34924034e8d8g-260_jpg_height_249_width_261_top_left_y_2246_top_left_x_771.jpg"width="200">

mer-isomer (optically inactive)

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