First, focus on where the electrons are starting and where they’re going—the arrow goes from the pi bond to the electrophile, then from the negative part to the positive charge. I lost marks in my exam by rushing and drawing them backwards. You see, my son in Dubai once tried to fix a wiring issue the wrong way and everything went dark; he said, "Amma, I should have followed the current." That’s like these arrows—follow the electron flow properly, or the whole mechanism fails.
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