Which of the following compound cannot be prepared ?

Which of the following compounds cannot be prepared by direct reaction between the constituent elements

Which of the following compounds cannot be prepared by the Wurtz reaction? (A) \(CH_{3}CH_{3}\) (B) \(CH_{3}CH(CH_{3})-CH_{3}\) (C)\(CH_{3}CH_{2}CH_{2}CH_{3}\) (D) All can be prepared

Which among the following compound cannot be prepared by direct union of elements ?