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(B) The reaction of an epoxide with triphenylphosphine $(PPh_3)$ is a stereospecific deoxygenation reaction. When $trans-2,3-epoxybutane$ reacts with

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$cis-2-butene$

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(B) The reaction of an epoxide with triphenylphosphine $(PPh_3)$ is a stereospecific deoxygenation reaction. When $trans-2,3-epoxybutane$ reacts with $PPh_3$,the reaction proceeds with retention of configuration,leading to the formation of $cis-2-butene$ as the major product. This occurs because the ring-opening and subsequent elimination of triphenylphosphine oxide $(O=PPh_3)$ involves a concerted mechanism that preserves the relative orientation of the substituents on the double bond.

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