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(B) The reaction shown is a Wittig reaction between fluorenone and the Wittig reagent $Ph_3P=CH_2$. In the first step,the carbonyl oxygen of fluorenon

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(B) The reaction shown is a Wittig reaction between fluorenone and the Wittig reagent $Ph_3P=CH_2$. In the first step,the carbonyl oxygen of fluorenone is replaced by the methylene group $(=CH_2)$ of the Wittig reagent to form $9-$methylenefluorene. Since the reaction is indicated to proceed further with the same reagent,and $9-$methylenefluorene is an alkene,it can undergo a cyclopropanation reaction (often via a carbene or similar mechanism if conditions allow,though typically Wittig reagents react with carbonyls). However,in the context of standard chemistry problems of this type,the reaction of a ketone with $Ph_3P=CH_2$ yields the corresponding alkene. If the reagent is added in excess to the product,it can lead to the formation of a cyclopropane ring across the newly formed double bond. Thus,the product $(x)$ is the spiro-cyclopropane derivative of fluorene.

The product $(x)$ is

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