Question

1.Which reaction mechanism is the most likely in the case of secondary haloalkanes and bulky hindered bases?

A. SN1 reaction

B, E1 reaction

C. SN2 reaction

D. E2 reaction

2. Which of the following compounds is most likely to induce an E2 reaction, with minimal competition from other E ans SN mechanisms?

A. CH₃O

B. (CH₃)₃CO^-

^C. HO^-

^D. Cl^-

^3. In an E1 reaction, incoming base will attack:

A.the hydrogen atom on the carbon adjacent to the carbocation center

B. the carbocation center

C. the hydrogen atom on the carbocation center

D. The leaving group

E. None of the above

4. A molecules of water is a bad leaving group.YES or NO

Answer 1

1.Bulky base cannot undergo substitution reaction because of steric hinderance . So it will proceed via E2 mechanism and give the product as alkenes . Bulky base snatches the easily available hydrogen atom and simultaneously halogen atom depart and formation of alkene takes place .

So option " D " is the correct answer.

2. Bulky base is the most likely to induce the E2 reaction . In the given bases , option " B " is the bulky base . So it is the correct answer.

3. In an E1 reaction , incoming base attacks the hydrogen atom on the carbon adjacent to the carbocation and give alkene as a product . Which adjacent carbon atom's hydrogen will be snatched depends on the formation of major product according to Saytzeff rule . So option " A " is the correct answer .

4 . It is a false statement . A molecule of water is a good leaving group .