what is the difference between concerted and non-concerted reactions?

Answer 1

Concerted reactions happen all at one, they have no intermediates. Non-concerted reaction take more than one step and therefore have intermediates

Answer 2

Concerted Reaction

Answer 3

Define Concerted

Answer 4

In a concerted reaction, the reaction occurs in a single step. In non-concerted reactions, a reactive intermediate (ex: carbonium ion) is required for the reaction to be completed. Sn2 and E2 reactions are concerted while Sn1 and E1 reactions are non-concerted.

Here maybe this will help some.

SN1 and E1 Reactions
SN2 and E2 vs. SN1 and E1
The SN2 and E2 mechanisms require a good nucleophile or a strong base. In contrast, SN1 and E1 mechanisms need weak nucleophiles and bases.
The nucleophiles and bases in SN1 and E1 reactions aren't strong enough to eject the leaving group by themselves. Instead, both SN1 and E1 reactions are characterized by the formation of a common carbocation intermediate. Even weak bases and poor nucleophiles will react with the carbocation.
Consequences of the Carbocation Intermediate
The carbocation intermediate lends a number of unique features to SN1 and E1 reactions. First, both mechanisms require a stable carbocation intermediate. Thus SN1 and E1 will only work for secondary or tertiary α-carbons**. Second, SN1 and E1 reactions involve a carbocation intermediate and are not concerted. Because of the geometry of the carbocation and their non- concerted nature, both reactions result in a loss of stereochemical configuration. Third, SN1 and E1 reactions are favored by polar, protic solvents. Polar, protic solvents stabilize the carbocation. Fourth, secondary carbocations may rearrange to form tertiary carbocations. This greatly increases the number of products.

Answer 5

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RE:
what is the difference between concerted and non-concerted reactions?

Answer 6

Concerted reactions occur in a single step, and thus do not require the production of the intermediate carbocation. "Non-concerted" reactions occure in 2 or more steps (ie. there may be one or more reaction intermediates,, one of which may be the common carbocation).

Answer 7

If you're the performer, you play a gig, but if you're a fan, it's a concert, as I've never heard a fan say they went to a gig last night. The underline concept of getting paid to play is what makes a gig different. It really has nothing to do with the size of the venue.

Answer 8

concentrated sol hav more amount of anions and cations thus sometimes react differently from aqueous sol...