The only o, p−directing group which is deactivating in nature is:
Correct answer: C. -X (halogens)
- A. -NH2
- B. -OH
- C. -X (halogens)
- D. -R (alkyl groups)
Explanation
Halides are ortho-para- directing groups but unlike most ortho-para- directors halides tend to deactivate benzene. This unusual behaviour can be explained by two properties:1. Since the halogens are very electronegative they cause inductive withdrawal (withdrawal of electrons from the carbon atom of benzene).2. Since the halogens have non-bonding electrons they can donate electron density through pi bonding (resonance donation).Option C 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?