How many of the following statments are correct regarding Claisen condensation reaction (when an ester is treated with a strong base)?
1. A proton is removed from the α -carbon to form a resonance stabilised carbanion of the ester.
2. Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule.
3. A new C−C bond is formed.
4. α,β unsaturated product is obtained