Question

Elimination reaction of 2-Bromo-pentane to form pent-2-ene is: 

(a) b-Elimination reaction 

(b) Follow Zaitsev rule 

(c) Dehydrohalogenation reaction 

(d) Dehydration reaction

(1) (a), (b), (d) 

(2) (a), (b), (c) 

(3) (a), (c), (d) 

(4) (b), (c), (d)

Answer 1

(2) (a), (b), (c) 

* This reaction is an example of \(\beta\)-elimination. 

* Hydrogen is removed from b-carbon and halgoen from \(\alpha\)-carbon, hence, dehydrohalgoenation reaction. 

* Generally in E2 reaction Zaitsev alkene is formed as major product (more stable alkene).