Chapter 8, Problem 80IP

Interpretation Introduction

Interpretation:

The all possible constitutional isomers of ${\text{C}}_{\text{4}}{\text{H}}_{\text{9}}\text{Br}$ are needed to be drawn and they should be arranged in increasing order of reactivity towards E2 reaction.

Concept introduction:

Constitutional isomers are having the same molecular formula and different bond connectivity between the atoms.

E2 reaction is a bimolecular elimination reaction, in which alkenes are formed when alkyl halides are treated with bases via eliminating one β-proton and one α-halo group of the alkyl halide.

The reactivity of alkyl halides are depends upon the stability of formed alkene product.

The more substituted alkenes are more stable as compared to less substituted alkenes. Because the more alkyl group attachment to a double bond make it more stable due to the ⁺I effect of alkyl groups. It means the alkyl groups will push electrons towards the double bonded carbon atoms, so the double bond becomes strengthened and highly stabilized.

To arrange: the constitutional isomers of ${\text{C}}_{\text{4}}{\text{H}}_{\text{9}}\text{Br}$ in increasing reactivity towards E2 reaction.