Which alcohol will most easily react with HCl to form an alkyl halide? Which alcohol will most easily react with HCl to form an alkyl halide?

A. Primary alcohol

B. Secondary alcohol

C. Tertiary alcohol

D. All alcohols react equally to form alkyl halides
Tertiary alcohols have greater reactivity with hydrogen halides than secondary alcohols, which in turn have comparatively more reactivity than primary alcohols. For tertiary alcohols, the reaction proceeds by an SN1 mechanism which prefers a more substituted alcohol. 
Therefore answer is C