Lucas test is given by an alcohol within 5 minutes. 0.22 ~g of which liberates 56 ~mL of CH ₄ at STP on treating with CH ₃ MgI. The structure of alcohol is

Step-by-step solution

Lucas test will be given by all the given alcohols within 5 minutes as all are 2^ alcohols. Exact structure can be known by molecular mass or formula of alcohol which will be obtained as follows : Let molecular mass of alcohol be M . 56 22400 = 0.22 M or, M= 22400 0.22 56 =88 The general formula of alcohols is C _n H _ 2 n+1 OH . The molecular mass 88 corresponds to the value of n=5 . Thus, the 2^ alcohol is ( CH ₃ )₂ CHCHOHCH ₃ .