Question

i) State Saytzeff Rule.

ii) Identify the major and minor products obtained by the reaction between 2-bromo butane and alcoholic KOH.

iii) Write the product obtained by the reaction between 2-bromo butane and aqueous KOH.

iv) 2-bromo butane exhibit optical isomerism. What is optical isomerism?

Answer 1

i) The Saytzeff rule states that in dehydro-halogenation reactions, the preferred product is that alkene which has a greater number of alkyl groups attached to the doubly bonded carbon atoms.

iv) Optical isomerism is the phenomenon in which molecules having the same molecular, as well as structural formulae, differ in the direction of rotation of the plane of plane polarised light.