An uncharged capacitor having capacitance C is connected across a battery of emf V. Now the capacitor is disconnected and then reconnected across the same battery but with reversed polarity.Then which of the statements is incorrect ?

After reconnecting, charge delivered by the battery is 2CV.
After reconnecting, no energy is supplied by battery.
After reconnecting, whole of the energy supplied by the battery is converted into heat.
After reconnecting, thermal energy produced in the circuit will be equal to 2CV²

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