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Transition State Calculation for SN2 reaction

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In which solvent SN2 reaction proceeds well?

a: Ethane Explanation

Explanation

b: Water Explanation

Explanation

c: Benzene Explanation

Explanation

d: DMSO Explanation

Explanation

A transition state in SN2 reaction is a first order saddle point. Which is the correct statement regarding this transition state:

a: It will have one imaginary frequency in its vibrational modes. Explanation

Explanation

b: It has the same geometry like the reactant. Explanation

Explanation

c: It has two imaginary frequencies in its vibrational modes. Explanation

Explanation

d: It is highly stable. Explanation

Explanation

Which of the following will have the slowest rate of SN2 reaction?

a: Methyl bromide Explanation

Explanation

b: Ethyl bromide Explanation

Explanation

c: Butyl bromide Explanation

Explanation

d: Propyl bromide Explanation

Explanation

Which statement is true about SN2 mechanism?

a: The rate of reaction increases on increasing strength of the nucleophile Explanation

Explanation

b: The reaction is faster in polar aprotic solvents Explanation

Explanation

c: The rate of reaction increases as the leaving group ability increases Explanation

Explanation

d: All of the above Explanation

Explanation

A SN2 reaction involves back side attack of nucleophile at the α-carbon of substrate because:

a: both nucleophile and leaving group are electron rich, nucleophilic attack occur from most distant position Explanation

Explanation

b: there is greater electron density on the back side of substrate Explanation

Explanation

c: there is enough physical space in the front side from where leaving group leaves the substrate Explanation

Explanation

d: substrate possesses a hole in the backside Explanation

Explanation

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