14. Which of the following statements explain why aryl halides and vinyl halides
ID: 885639 • Letter: 1
Question
14. Which of the following statements explain why aryl halides and vinyl halides do not undergo nucleophilic substitution by either the SN1 or SN2 mechanism? (Points : 3)
They don't undergo SN1 reactions because a higher percent s-character makes the bond longer and stronger.
They don't undergo SN2 reactions because a higher percent s-character makes the bond shorter and stronger.
They don't undergo SN2 reactions because heterolysis of the C-X bond forms a highly unstable carbocation.
They don't undergo SN1 reactions because the carbocation is highly electronegative.
10. Which of the following statements is not true? (Points : 2)
In polar protic solvents, nucleophilicity decreases down a column of the periodic table as the size of the anion increases.
Nucleophilicity is affected by the solvent used in a substitution reaction.
Polar protic solvents are capable of intermolecular hydrogen bonding.
Polar protic solvents solvate both cations and anions.
6. Which of the following statements about a catalyst is true? (Points : 3)
A catalyst accelerates a reaction by changing the amount of reactant and product at equilibrium.
A catalyst accelerates a reaction by lowering the energy of activation.
A catalyst accelerates a reaction by raising the energy of activation.
A catalyst accelerates a reaction by lowering the equilibrium constant.
2. Which of the following statements about elimination reactions is true? (Points : 3)
Two ? bonds are broken.
Two ? bonds are formed.
Two ? bonds are broken.
Two ? bonds are formed.
Homolysis generates uncharged reactive intermediates with unpaired electrons.
Homolysis require energy but heterolysis does not require energy.
Heterolysis generates charged intermediates.
Heterolysis involves unequal sharing of bonding electrons by atoms.
Explanation / Answer
14. The aryl halides and vinyl halides do not undergo nucleophilic substitution by either the SN1 or SN2 mechanism because,
They don't undergo SN2 reactions because a higher percent s-character makes the bond shorter and stronger.
They don't undergo SN1 reactions because the carbocation is highly electronegative.
10. False statement is,
In polar protic solvents, nucleophilicity decreases down a column of the periodic table as the size of the anion increases.
6. True statement about catalyst
A catalyst accelerates a reaction by lowering the energy of activation.
2. Elimination reaction,
Two ? bonds are broken.
3. bond breaking false statement.
Homolysis require energy but heterolysis does not require energy.
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