15. Which of the tollowing reagentís) gives the reaction below (A) CH,CI (B) CFe

Question

15. Which of the tollowing reagentís) gives the reaction below (A) CH,CI (B) CFe (C) CW AICI (D) Cly FeCl Cly HCI 16. Which of the following functional groups are m-directing? (A) NO, CH, OH (B) Br, NH. COOH (C)I, SO,H, OH (D) OCHs. CL, COCH (E) COCH, SO,H, CHO 17. Which statement about benzene is incorreet? (A) The C-C - bonding is delocalized (B) The C, ring is planar (C) The average C- C bond distance is the same as C-C double bonds (D) Each C atom is sp hybridized (E) There are 12 o (sigma) bonds in benzene 18. Which of the following is a conjugated diene (A) cyclopentadiene (B) 2-methylcyclohexanone (C) 1-methyl.cyclobexa-1,4-diene (D) cyclobexa-1,4-diene (E) cycloocta-1,5-diene 19. The aromatic compound is (C) Ph-OH Ph-Cl (A) Ph-CH3 Ph-COOH (D) Ph-Br Ph-NH2 (B) Ph-CH3 Ph-CHO (E) none of these 21. Friedal-Craft alkyation reagent(s) 1 (X GH AC ecie cauacoa (o) cHCOCTAICI, (D)CHCOCrec, 22. Major product in the reaction of benzene with I-bromo propane, in the presence of AlBr, catalyst (C) iso-propylbenzene (D) o-bromo-n-propylbenzene (A) bromobenzene (B) n-propylbenzene (E) p-bromo-n-propylbenzene 23. Which of the following is the electrophile in the Friedel-Craft acylation reaction 24. The benzyne intermediate has bonds 25. The reagent used for benzylic bromination is: (A) RCO (B)RCO (C) CO (D) RX/H,SO4 (E) RCO, (A)1 (B)2 (C)3 (D) 4 (E) 5 (A) NBS (B) Br/ Fe (C) Brol AlBrs (D) Bry/ FeBr (E) Bro HBr

Explanation / Answer

I've answered the first four questions. I'm supposed to answer one question at a time.

15. Option C and D will give the required product by electrophilic aromatic substitution. It requires a Lewis acid.

16. Option E has all meta directing groups.

17. C-C single bond is not the same as C-C double bond. So option C is incorrect.

19. Option D is aromatic as it is planar, undergoes resonance, and follows huckel's rule as there are 6 electrons participating in resonance.

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