Which of the following type of alkyl halide is the most reactive w.r.t SN1:
Correct answer: B. Option B
- A. R - X
- B. Option B
- C. R - CH2 - X
- D. Option D
Explanation
Tertiary alkyl halides are the most reactive in SN1 reactions because they have the most stable carbocation intermediates. A carbocation is a carbon atom with a positive charge. In an SN1 reaction, the first step is the ionization of the alkyl halide to form a carbocation. The stability of the carbocation determines how fast the reaction will proceed.Tertiary alkyl halides have the most stable carbocation intermediates because they have three alkyl groups attached to the carbocation carbon atom. These alkyl groups are electron-donating groups, which means that they donate electrons to the carbocation. This delocalizes the positive charge on the carbocation, making it more stable. Therefore, option b is correct.
Last updated
About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
Practise Alkyl Halides
458 free Alkyl Halides MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1-Chloropropane and 2-Chloropropane are _.
𝑂𝐻− + 𝐶2𝐻5 − 𝐼 ⟶ 𝐶2𝐻5 − 𝑂𝐻 + 𝐼− One of the species in the above reaction is a substrate. It is:
2-Chloro-2-methylpropane is an example of:
2-Chlorobutane belongs to:
A compound X (C4H9Br) undergoes the following reactions: C4H9Br NaOH(aq)/heat > C4H10O Cr2O7(2-), H+(aq)/ heat> C4H8O. What is X?