Which of the following is the structure of an alcohol with molecular formula C ₅ H ₁₂ O ?

Step-by-step solution

The degree of unsaturation is calculated using the general formula DU = c - h/2 + n/2 - x/2 + 1 . For C ₅ H ₁₂ O (with c=5 , h=12 , n=0 , o=1 , x=0 ), this gives DU = 5 - 12/2 + 0/2 - 0/2 + 1 = 0 . A DU of 0 confirms the molecule is saturated—containing no rings or multiple bonds. Option A is cyclopentanol, which contains a ring (DU = 1) and has molecular formula C ₅ H ₁₀ O , not matching C ₅ H ₁₂ O . Option B is 1-pentanol. With 5 carbons, 12 hydrogens, and 1 oxygen, its formula is C ₅ H ₁₂ O and DU = 0. Option C