A carbanion is an organic ion in which a carbon atom carries a negative charge. A carbocation is an organic ion in which a carbon atom carries a positive charge. The reaction of aqueous sodium hydroxide with 1-bromobutane follows an $\text{S}_\text{N}2$ mechanism. What description should be given for the first step in the mechanism?
- Aattack by a nucleophile on a carbon atom with a partial positive charge
- Bheterolytic bond fission followed by an attack by an electrophile on a carbanion
- Cheterolytic bond fission followed by an attack by a nucleophile on a carbocation
- Dhomolytic bond fission followed by an attack by a nucleophile on a carbocation