Which of the following alkyl halides is not suitable for Corey-House synthesis of alkanes-

Which of the fallowing alkyl halides is not suitable for Corey-house synthesis of alkanes?

Which of the following alky halides is not suitable for Corey-House synthesis alkanes ?

Which of the following alkyl halides is not suitable for reactions with lithium dialkylcuprate in the Corey-House synthesis?

Which of the alkyl halides is least suitable for dehydrohalogenation ?

Which one of the following alkyl halide gives best yield in Williamson synthesis ?

Which of the following alkyl halides is least reactive in the Willamson synthesis of ether ?

Corey-House reaction.