The electron displacement in a covalent bond of a molecule is produced by which type of effects?

The number of no bond resonance structures possible for but$-1-$ene and a $3^{\circ}$ carbocation having methyl,ethyl,and isobutyl groups on the cationic carbon,respectively,are:

Match List-$I$ with List-$II$:
| List-$I$ (Mechanism steps) | List-$II$ (Effect) |
| :--- | :--- |
| $(A)$ Aniline resonance structure | $(I)$ $-E$ effect |
| $(B)$ Electrophilic addition of $H^+$ to alkene | $(II)$ $-R$ effect |
| $(C)$ Nucleophilic addition of $CN^-$ to alkene | $(III)$ $+E$ effect |
| $(D)$ Nitrobenzene resonance structure | $(IV)$ $+R$ effect |
Choose the correct answer from the options given below:

Identify the $-I$ effect causing group from the following.

Determine the correct order of stability for the following carbocations:

In which of the following is hyperconjugation not possible?