Consider all the structural isomers of the compound with molecular formula C ₅ H ₁₁ Br . When these isomers are separately subjected to dehydrohalogenation using alcoholic KOH , some of them produce an alkene that can exhibit geometrical isomerism. The number of such structural isomers of C ₅ H ₁₁ Br is ____.

Step-by-step solution

The structural isomers of C ₅ H ₁₁ Br are: 1. 1-bromopentane 2. 2-bromopentane 3. 3-bromopentane 4. 1-bromo-3-methylbutane 5. 2-bromo-3-methylbutane 6. 1-bromo-2-methylbutane 7. 2-bromo-2-methylbutane 8. 1-bromo-2,2-dimethylpropane Dehydrohalogenation of these isomers with alcoholic KOH yields alkenes via E2 elimination. We must identify which isomers produce an alkene capable of showing geometrical (cis-trans) isomerism. - 2-bromopentane produces pent-2-ene (major) and pent-1-ene (minor). Pent-2-ene exhibits geome