JEE Main levelSingle correct optionDifficulty 2 of 3g3019
In the allyl cation CHX2=CH−CHX2X+, the positive charge is:
Ashared equally among all three carbons
Bshared equally between the two terminal carbons
Clocated only on one terminal carbon
Dlocated only on the central carbon
Answer: B
The two resonance structures CHX2=CH−CHX2X+ and +CHX2−CH=CHX2 are equivalent. Each terminal carbon carries about +1/2 and the central carbon carries none.