Question

When trans-1,2-Dibromocyclopentane is treated with NaNH/NH A, 1-Bromocyclopentene is formed. What product would be expected and why does 1-Bromocyclopentene form instead? 58. Briefly but completely describe where and what should be "seen" in the following spectra for I-Ethoxy-4. bromobenzene Mass Spec IR H NMR "C NMR

Answer 1

In ques no. 42

Option (c) is correct because tertiary carbocation is most stable.

Key point: Order of stability of carbocations are as follow:-

Tertiary > Secondory > Primary

In ques no. 43

Option (b) is correct because H & X are at 180°.

In ques no. 44

Option (e) is correct.

Reasons are as follows:

1.HOCH3 combines with acetone and forms hameketal(this reaction is much faster than halides).

2.Water is highly solvated in acetone while nucleophile must be atleast partially removed from its solvent shell to participate in SN reactions.