Among all the structural isomers of C ₅ H ₁₁ Br , first identify those which are optically active. When these optically active isomers are separately treated with sodium ethoxide in ethanol, the number of isomers that yield an alkene as the major product is ____.

Step-by-step solution

First, we identify the optically active structural isomers of C ₅ H ₁₁ Br . A molecule is optically active if it contains a chiral center (a carbon atom bonded to four different groups). The 8 structural isomers of C ₅ H ₁₁ Br are: 1. 1-bromopentane (achiral) 2. 2-bromopentane (chiral at C2, 2^ halide) 3. 3-bromopentane (achiral) 4. 1-bromo-3-methylbutane (achiral) 5. 2-bromo-3-methylbutane (chiral at C2, 2^ halide) 6. 1-bromo-2-methylbutane (chiral at C2, 1^ halide) 7. 2-bromo-2-methylbutane (achiral) 8. 1-bromo-2