Addition of HBr to 2-butene gives two products while that of HBr to 1-buane gives three products . Explain why ?

Addition of HBr to 2-butene gives two products while that of HBr to 1-

1.	Addition of HBr to 2-butene gives two products while that of HBr to 1-buane gives three products . Explain why ?
Answer» SOLUTION :Addition of HBr to 2-butene gives 2-bromobutane which being a chiral molecule EXISTS as two STEREOISOMERS ( I and II) .<BR> In contrast, 1-butene is an unsymmetrical molecule, therefore , it gives two products, i.e., 2-bromobutane (major product ) and 1-bromobutane (minor product). Since 2-bromobutane is a chiral molecule, it exists as two stereoisomers (I+II) as shown below above . While 1-bromobutane being a achiral molecule exists as such (III). `underset"1-Butene"(CH_3-CH_2-CH=CH_2) overset"HBr"to underset"I+II"(CH_3-CH_2-undersetunderset(Br)\|overset**CH-CH_3)+underset"III"(CH_3CH_2CH_2CH_2-Br)` Thus, in all three products (I, II and III ) are FORMED.