Which of the alkyl halides is least suitable for dehydrohalogenation ?

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

Which of the following alkyl halides will not undergo dehydrohalogenation unless the conditions are drastic ?

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

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

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

Which of the following alkyl halides undergoes the fastest base-induced dehydrohalogenation?

Which of the following products as shown by the dehydrohalogenation of alkyl halides with sodium ethoxide in ethanol is correctly marked as major product?