SN1 reaction undergoes through a carbocation intermediate as follows:[R = t-Bu, iso-Pr, Et, Me] (X = Cl, Br, I)The correct statements are:I. The decreasing order of rate of SN1reaction is t-BuX > iso-PrX > EtX > MeXII. The decreasing order of ionization energy is MeX > EtX > iso-PrX > t-BuXIII. The decreasing order of energy of activation is t-BuX > iso-PrX > EtX > MeX

Organic Reaction Concepts include: Displacement and nucleophilic substitution reactions, organic compound mechanism, elimination reactions, redox reactions,  photochemistry, nucleophiles, electrophiles, bond cleavage, reaction intermediates and kinetics. Here are some concepts related to organic reactions: Elimination reactions: Involves the elimination of two substituents from a molecule in one or two steps. Most elimination reactions result in the loss of at least one hydrogen atom and form double bonds. Substitution reactions: Involves the substitution of one atom for another. Addition... Show more

Organic Reaction Concepts include: Displacement and nucleophilic substitution reactions, organic compound mechanism, elimination reactions, redox reactions,  photochemistry, nucleophiles, electrophiles, bond cleavage, reaction intermediates and kinetics.

Here are some concepts related to organic reactions:
Elimination reactions: Involves the elimination of two substituents from a molecule in one or two steps. Most elimination reactions result in the loss of at least one hydrogen atom and form double bonds.
Substitution reactions: Involves the substitution of one atom for another.
Addition reactions: Involves the addition of an atom to a compound with double or triple bonds.
Isomerism: An important topic in organic chemistry. In most organic reactions, the products are formed based on the concept of isomerism.
Resonance: An essential aspect of organic chemistry. If the electron pattern of a molecule cannot be described with the help of one Lewis structure, it is called a resonance hybrid.
Aryl radicals: Versatile synthetic intermediates in organic chemistry. They also play roles in biology, such as in the DNA cleavage process. 

Organic reactions are generally slower than inorganic reactions because organic compounds contain covalent bonds. Covalent bonds are typically harder to break. Most organic reactions are carried out in multiple steps. 

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