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Standard XII

Chemistry

Physical Properties of Haloarenes

For an SN2 ...

Question

For an $S_{N} 2$ reaction, which of the following statements are true?

The rate of reaction is independent of the concentration of the nucleophile.

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The nucleophile attacks the C-atom on the side of the molecule opposite to the group being displaced.

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The reaction proceeds with simultaneous bond formation and rupture.

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All of the above.

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Solution

The correct options are
B The nucleophile attacks the C-atom on the side of the molecule opposite to the group being displaced.
C The reaction proceeds with simultaneous bond formation and rupture.
The nucleophile attacks the substrate on the opposite to the leaving group.
Also, the formation and breaking of bond take place simultaneously unlike the $S_{N} 1$ reaction.
In $S_{N} 2$ reaction, the rate of reaction depends on the concentration of both nucleophile and the substrate.

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Similar questions

Q. Increasing the concentration of an electrophile in a typical

S_{N^{2}}

reaction by a factor of

3

and the concentration of the nucleophile by a factor of

3

will change the reaction rate to :

Q. Consider the following statements :
(1) Bridgehead halides are inert towards both

S {_{N}}^{1}

and

S {_{N}}^{2}

reactions (till one of the ring size is eight member ring)
(2) The first step in both

S {_{N}}^{1}

and

E_{1}

(3)

S {_{N}}^{2}

reaction proceed with total retention of configuration
(4)

E_{2}

elemnations are by use of asolvent of low polarity and high concentration of a strong base
Which og the above statements are correct?

The most characteristic reaction of aldehyde and ketones is nucleophilic addition to carbon oxygen double bond. Aldehyde and ketones are easily susceptible to nucleophilic addition because of structural features. The trigonal planar arrangement of groups around the carbonyl carbon atom means that the carbonyl carbon atom is relatively open to attack from above and below the plane of carbonyl group. The partial positive charge on the carbonyl atom means that it is especially susceptible to attack by a nucleophile

Oximes are formed by the reaction of aldehyde or ketones with

Which of the following statements is correct ?
(a) The rate of reaction decreases with passage of time as the concentration of reactants decreases
(b) The rate of reaction is same at any time during the reaction
(c) The rate of a reaction is independent of temperature change
(d) The rate of a reaction decreases with increase in concentration of reactant (s)

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 regarding the reaction?

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For an SN2 reaction, which of the following statements are true?

For an $S_{N} 2$ reaction, which of the following statements are true?