Consider the following statements regarding hyperconjugation: (I) It is a permanent electronic effect. (II) It involves the delocalization of electrons. (III) It is also known as no-bond resonance. (IV) In carbocations, it involves the overlap of a C-H bond with an empty p-orbital. How many of the above statements are correct?

Step-by-step solution

Statement (I) is correct: Hyperconjugation is a permanent effect, unlike the electromeric effect which is temporary. Statement (II) is correct: It involves the delocalization of electrons of a C-H bond of an alkyl group directly attached to an atom of an unsaturated system or to an atom with an unshared p-orbital. Statement (III) is correct: Since there is no bond between the alpha-carbon and the hydrogen atom in some of the contributing resonance structures, it is also known as no-bond resonance. Statement (IV) is