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  4. The maximum number of stereo isomers possible for 4-phenyl but-3-en-2-ol is

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Q. The maximum number of stereo isomers possible for 4-phenyl but-3-en-2-ol is

VMMC MedicalVMMC Medical 2015

Solution:

$ PhHC=HC-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} OH \\ |* \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}} $ Maximum 4 -isomers are possible as, $ \left. \begin{align} & \,\,\,\,\,\,\text{cis}-\text{R} \\ & \,\,\,\,\,\,\text{cis}-\text{S} \\ & \text{trans}-\text{R} \\ & \text{trans}-\text{S} \\ \end{align} \right\}\text{4}-\text{isomers} $