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Standard XII

Chemistry

Nucleophilic Substitution in Alkyl Halides

Which of the ...

Question

Which of the following statements is not correct about $S_{N} 2$ reactions of alkyl halides?

Nucleophile attacks the carbon from the side opposite to where the leaving group is attached.

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The bond formation and bond breaking take place in one step.

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The rate of reaction depends upon the concentration of nucleophile.

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S_{N} 2

mechanism is predominant in tertiary alkyl halides.

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Solution

The correct option is C $S_{N} 2$ mechanism is predominant in tertiary alkyl halides.
The option D is incorrect as in case of tertiary alkyl halides, the carbon on which nucleophile is supposed to attack is is crowded, making this reaction less feasible.

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Similar questions

Q. Alkyl halides and alcohols easily undergo nucleophilic substitution either through

S_{N} 1

S_{N} 2

mechanism. The relative case of these two processes depends upon the nature of the substrate (alkyl group) as well as leaving group, nature of nucleophile and also upon the nature of the solvent.

S_{N} 1

mechanism involves the formation of carbocation as intermediate while

S_{N} 2

mechanism involves the formation of a transition pentavalent state.

S_{N} 1

is the main mechanism in

3^{0}

alkyl halides and alcohols, while

S_{N} 2

mechanism is the path adopted by most of the

1^{o}

alkly halides;

2^{o}

alkyl halides may follow

S_{N} 1

as well as

S_{N} 2

What happens when

1^{o} R O H

react with

H X

Q. In

S_{N} 2

reactions the sequence of bond breaking and bond formation is as follows :

Q. Alcohols can be prepared by haloalkanes using hydroxide ion in aqueous media through

S_{N} 1

and

S_{N} 2

.
The

S_{N} 1

reaction is a two-step reaction. In the first step, the carbon-halogen bond breaks to generate a stable carbocation. In the second step, the nucleophile reacts rapidly with the carbocation. This reaction follows first order kinetics.
The

S_{N} 2

is a concerted reaction in which transition state is achieved where bond making and bond breaking occur simultaneously. This reaction follows second order kinetics.
Consider the following reaction sequence.

Which of the following statement is correct about the mechanism of this reaction?

Q. Tertiary alkyl halides are particularly not substituted by

S_{N} 2

mechanism, because of:

Q. The correct decreasing order of reactivity for a given alkyl

(R)

group in both

S_{N} 1

and

S_{N} 2

reaction mechanisms is:

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Which of the following statements is not correct about SN2 reactions of alkyl halides?

The correct option is C SN2 mechanism is predominant in tertiary alkyl halides.The option D is incorrect as in case of tertiary alkyl halides, the carbon on which nucleophile is supposed to attack is is crowded, making this reaction less feasible.

Which of the following statements is not correct about $S_{N} 2$ reactions of alkyl halides?

The correct option is C $S_{N} 2$ mechanism is predominant in tertiary alkyl halides.
The option D is incorrect as in case of tertiary alkyl halides, the carbon on which nucleophile is supposed to attack is is crowded, making this reaction less feasible.