Find the total number of primary alcohols that are structural isomers possible for the molecular for — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

First, calculate DU for $C_4H_{10}O$: $DU = 4 + 1 - \frac{10}{2} = 0$. Since DU is 0, the compound is a saturated, acyclic alcohol or ether. The parent carbon skeletons for 4 carbons are n-butane and isobutane. From n-butane, we get $CH_3CH_2CH_2CH_2OH$ (Butan-1-ol, a $1^\circ$ alcohol) and $CH_3CH_2CH(OH)CH_3$ (Butan-2-ol, a $2^\circ$ alcohol). From isobutane, we get $CH_3CH(CH_3)CH_2OH$ (2-Methylpropan-1-ol, a $1^\circ$ alcohol) and $(CH_3)_3COH$ (2-Methylpropan-2-ol, a $3^\circ$ alcohol). Only 2 of these are primary ($1^\circ$) alcohols.