Which of following functional groups are deactivating and not ortho, para directing?
Correct answer: B. -COR
- A. -R
- B. -COR
- C. -NH2
- D. NR2
Explanation
Ortho and para directing grps release electrons to the benzene ring increasing the chemical reactivity of the benzene ring towards electrophiles. Meanwhile meta directing grps withdraw the electrons from the benzene ring towards themselves decreasing their availability towards electrophiles. Therefore the answer will be B.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
Practise Chemistry of Hydrocarbons
1,091 free Chemistry of Hydrocarbons MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Benzene and Aromatic Compounds questions
Aromatic compounds generally burn with smoky flame because:
Which is a trimer of ethyne?
Compared to benzene, nitration of toluene takes place at:
Benzene reacts with acetyl chloride in the presence of lewis acid forming:
When acetylene is passed through hot iron tube at 400 oC, it gives:
Which of the following substitutents is an Ortho and Para director and ring deactivating?