The dehydration yield of cyclohexanol $(C_{6} H_{11} O H)$ to cyclohexene $(C_{6} H_{10})$ is $75 %$ . What would be the yield if $100$ g of cyclohexanol is dehydrated?

61.5

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16.5

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6.15

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0.615

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Solution

The correct option is B $61.5$ g
The molar masses of cyclohexanol and cyclohexene are 100 g/mol and 82 g/mol respectively. When 100 g of cyclohexanol are dehydrated, 82 g of cyclohexene are obtained. This is assuming 100% yield. But the dehydration yield is 75%.
Hence, when 100 g of cyclohexanol are dehydrated, the yield of cyclohexene is $82 \times \frac{75}{100} = 61.5$ g.

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