JEE MAIN - Chemistry (2021 - 26th August Morning Shift - No. 5)
The major product formed in the following reaction is :
_26th_August_Morning_Shift_en_5_1.png)
_26th_August_Morning_Shift_en_5_2.png)
_26th_August_Morning_Shift_en_5_3.png)
_26th_August_Morning_Shift_en_5_4.png)
_26th_August_Morning_Shift_en_5_5.png)
Explanation
_26th_August_Morning_Shift_en_5_6.png)
This addition is known as 1, 4-addition.
Mechanism This reaction can undergoes two pathways
_26th_August_Morning_Shift_en_5_7.png)
Out of the two intermediates formed in two paths, the path B intermediate is more stable as it has more stable carbocation. So, a major product will be formed because of path B.
_26th_August_Morning_Shift_en_5_8.png)
1, 2-addition product is formed at low temperature and will be less stable as the double bond is less substituted. 1, 4-addition is a thermodynamically stable product as the double bond is more substituted. As diene is in excess and HBr is limited in reaction, so diene cannot be formed. So option (b) is incorrect.
Comments (0)
