Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is:a)3° > 2° > 1°b)3° < 2° < 1°c)2° < 1° < 3°d)3° < 1° < 2°Correct answer is option 'A'. Can you explain this answer?

Question

Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is:a)3&#176; &#62; 2&#176; &#62; 1&#176;b)3&#176; &#60; 2&#176; &#60; 1&#176;c)2&#176; &#60; 1&#176; &#60; 3&#176;d)3&#176; &#60; 1&#176; &#60; 2&#176;Correct answer is option 'A'. Can you explain this answer?

Answer

The correct answer is option A
Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is 3^o > 2^o > 1^o because in SN₁ nucleophilic reaction, the first and the slow step is the formation of a carbocation. Tertiary carbocation is more stable than a secondary carbocation which is more stable than a primary carbocation. Greater the stability of the carbocation, greater will be the ease of formation of carbocation, and hence faster will be the rate of the reaction.

Answer

The order of SN1 reaction depends upon the stability of the carbocation intermediate formed . the stability of the carbocation intermediate for alkyl halides would be tertiary>secondary>primary. thus,op A.

Answer

In Sn1 mechanism formation of cation takes place as 3(tertiary) cation is more stable than secondary and secondary more than primary cation!

Answer

SN1 (Substitution Nucleophilic Unimolecular) reaction is a two-step reaction mechanism that involves the formation of a carbocation intermediate. The reactivity of alkyl halides towards SN1 reaction depends on the stability of the carbocation intermediate formed.

The stability of the carbocation intermediate is influenced by three main factors:

1. Degree of substitution: Alkyl halides can be classified into three categories based on the number of alkyl groups attached to the carbon atom bonded to the halogen atom. These categories are primary (1°), secondary (2°), and tertiary (3°) alkyl halides. The stability of the carbocation intermediate increases with increasing degree of substitution. This is because the alkyl groups attached to the carbon atom stabilize the positive charge through inductive and hyperconjugation effects.

2. Hyperconjugation: Hyperconjugation is the stabilizing interaction between a filled σ-bond (such as C-H or C-C) and an empty p-orbital or a positively charged species. Tertiary alkyl halides have more alkyl groups available for hyperconjugation, which leads to greater stabilization of the carbocation intermediate.

3. Resonance: Resonance stabilization occurs when the positive charge of a carbocation can be delocalized over multiple atoms through the movement of pi electrons. Alkyl halides that contain a carbocation adjacent to a pi bond or a lone pair of electrons have increased stability due to resonance effects.

Based on these factors, the reactivity of alkyl halides towards SN1 reaction can be ranked as follows:

a) 3° > 2° > 1° (tertiary alkyl halides are the most reactive, followed by secondary, and then primary alkyl halides)

Therefore, option 'A' is correct, as it correctly represents the reactivity order of alkyl halides towards SN1 nucleophilic substitution reaction.

Answer

It is because in SN1 mechanism solvolysis of carbon-halogen bond takes place which leads to the formation of carbocation.since tertiary carbocation is more stable so the reactivity of alkyl group is the given order

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