Question

1. In which of the following reaction, the major product alkene is formed by E1cb mechanism?(1) CH₃ - CH₂ - CH₂ - CH₂ - Br alc. KOH (H₂ - CH2CH=CH2alc. KOH(2) CH3 - CH2 - CH-CH: –CH-CH:CH-CHalc. KOH(3) CH3 - CH2 - CH - CH,10Nav(4) CH Falc. KOH​

Answer 1

answer 2 is an answer so easy answer

Answer 2

CH₃ - CH₂ - CH - CH3 - Br alc. KOH (H₂ - CH2CH=CH2 is the reaction.

Explanation:

• E1CB is the process by which a substituted alkane form its corresponding alkene taking hydrogen from the beta carbon.

• For E1CB to occur, the substituted alkane must have a good leaving group.

• It also must have a hydrogen on one of its beta carbon.

• Here in 2 bromo butane, the bromine is a good leaving group.

• The compound also has beta hydrogens.

• The carboncation formed takes the hydrogen and forms the double bond easily.

For more information about E1CB mechanism,

https://brainly.in/question/10778790

Why does rearrangement of carbonation does not take place in e1cb elimination?

https://brainly.in/question/10325019

What is E1CB reaction ??​ - Brainly.in