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Byju's Answer

Standard XII

Chemistry

Ozonolysis of Aromatics

( I think Ans...

Question

( 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)

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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.

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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

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( 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)