1. NH2- can be Bronsted-Lowry acid.
2. OCH3CH3 can be Bronsted-Lowry base.
3. CH3+ can be a Lewis acid.
4. NH2- can be Bronsted-Lowry acid, and CH3CH3 can be Bronsted-Lowry base.
5. CH3CH3 can be Bronsted-Lowry acid, and CH3+ can be a Lewis acid.
The Correct Answer is: 3
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