Which of the following carbocations is expected to be least stable ?ABCD

What is the order of stability of the following carbocations ?(I) CH2=CH−C⊕H2I CH2=CH-C⊕H2  (II) CH3−C⊕H2;II CH3-C⊕H2; (III)III

Which of the following is most stable?

Which of the following is true regarding the relative stability of carbocation and carbanion species as the number of alkyl substituents increases relative to hydride substituents?A.As the number of alkyl substituents increases, carbocation stability increases but carbanion stability decreases.B.As the number of alkyl substituents increases, carbocation stability decreases but carbanion stability increases.C.As the number of alkyl substituents increases, carbocation stability and carbanion stability both increase.D.As the number of alkyl substituents increases, carbocation stability and carbanion stability both decrease.

Which of the following has the least stable enol form?

Assertion (A): (CH),ct carbocation is more easily formed than (CH¡)2 *CH carbocation.Reason (R): Tertiary butyl carbocation is more stable than isopropyl carbocation.