Which of the following types of reactions proceed through an intermediate? (Circ

Question

Which of the following types of reactions proceed through an intermediate? (Circle one) El E2 Neither Both Which of the following types of reactions proceed via a concerted process? (Circle one) El E2 Neither Both Fill in the blank using the answers below: In an E2 reaction, the leasing group must be to the hydrogen being removed. (Circle one) Gauche Anti-periplanar Staggered Eclipsed Vicinal Syn-periplanat Which of the following are good leaving groups? (Circle all that apply) OH H_2O Br I F H CH_2 CH_3OH CH_3SH NH_3 which of the following are Strong bases? (Circle all that apply) KOH NaNH_2 NaCn H_2O H_2S NaI tBuOH

Explanation / Answer

1. E1 reaction there is formation of intermediate usually a carbocation is form.

2. E2 reaction proceed with concerted manner as the rate of the E2 reaction depends on both substrate and base, since the rate determining step is bimolecular it proceed via a concerted.

3. As the E2 reaction results in the formation of a pi bond, the leaving group should be antiperiplanar to the hydrogen being to removed.

4. I- is a good leaving group. as good leaving groups are weak bases.

5. KOH is the strong base as compared to the other bases

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