( I think Ans is due to highest no. Of beta hydrogen) The following compounds are given to you :
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
Write the compound which is most reactive towards beta ?-elimination
reaction. Give reason
(Ans : 2-Bromo-2-methylbutane)

Open in App

Solution

The solution is as follows:

1. The beta elimination is favoured when high substituted alkene is formed.

2. Thus, when we see beta elimination of 2-Bromo-2-methylbutane, we get 2-methylbut-2-ene.

3. This compound is highly substituted alkene in comparison to the alkene products we get from the other two molecules.

Suggest Corrections

Similar questions

Q. The Following compounds are given to you:
2- Bromopentane, 2- Bromo - 2 methylbutane, 1- Bromopentane.

(a) Write the comound which is most reactive towards

S_{N} 2

reaction.
(b) Write the compound which is optically active.
(c) Write the compound which is most reactive towards

β

- elimination reaction.

Q. Arrange the compounds of each set in order of reactivity towards

S_{N} 2

displacement.
(i) 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

(ii) 1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 2-Bromo-3-methylbutane

(iii) 1-Bromobutane, 1-Bromo-2, 2-dimethylpropane, 1-Bromo-2-methylbutane,1-Bromo-3-methylbutane.

Q. The reactivity of

2

-bromo-

2

-methylbutane

(I)

1

-bromopentane

(I I)

and

2 -

bromopentane

(I I I)

towards

S_{N} 2

displacement is such that:

Predict all the alkenes that would be formed by dehydrohalogenation of the following halides with sodium ethoxide in ethanol and identify the major alkene:

(i) 1-Bromo-1-methylcyclohexane

(ii) 2-Chloro-2-methylbutane

(iii) 2,2,3-Trimethyl-3-bromopentane.

Q. Elimination reaction of

2 -

Bromopentane to form Pent-2-ene is:
(a)

β -

Elimination reaction
(b) Follow Zaitsev rule
(c) Dehydrohalogenation
(d) Dehydration reaction

Join BYJU'S Learning Program

( I think Ans is due to highest no. Of beta hydrogen) The following compounds are given to you : 2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane Write the compound which is most reactive towards beta ?-elimination reaction. Give reason (Ans : 2-Bromo-2-methylbutane)

( I think Ans is due to highest no. Of beta hydrogen) The following compounds are given to you :
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
Write the compound which is most reactive towards beta ?-elimination
reaction. Give reason
(Ans : 2-Bromo-2-methylbutane)