1. Which of the following reacts fastest with NaOH in ethanol by S 2 mechanism.

Question

1. Which of the following reacts fastest with NaOH in ethanol by S 2 mechanism. (A) CH,CI (B) CH,Br (C) CHl (D) CHCHCI (E) CH,CH, A) Fe/H,SO (B) CH,COOH (C) KMno (D) NBS/HO (E) HNO/H,SO, (A) carbonium ion (B) free-radical (C) carbanion(D) carbon with 5-bonds (E) a primary carbon (A) primary carbon (B) free-radical (C) carbonium ion (D) carbon with 5-bonds (E) carbanion 2 which of the following reagent(s) can be used to prepare benzoic acid ( Ph-COfrom toluene ? 3. Intermediate in the Sy1 mechanism is a 4. Transition state in the Sy2 mechanism is a 5. Which of the following reagent(s) gives the reaction below (A) CHyBr (B) HBr (C) Bry/ CCL (D) NBS/ CCL (E) CH,Br/FeBr 6. Formula of aniline is: (A) C,H,OH (B) C&H;,NH (C) C,HNH: (D) CH,NH, (E) CH,NO 7· The rate of SN1 reaction is proportional to: (A) Base concentration (B) RX concentration (C) Nucleophile concentration (D) RX and Nucleophile concentrations (E) leaving group concentration 8·The most likely mechanism for the reaction: (A) SI (B) SA2 (C)EI (D) E2 (E) Elc (C) 8 (D) 12 (E) 16 9. An allowed number of electrons for an aromatic compound is: (A) 2 (B) 5 10. Which of the following is the best leaving group ? 11. Which of the following reacts fastest with NaOH in water by Sy1 mechanism. 12. Which of the following is the best solvent for Sy 1 mechanism ? (A) F- (B) C- (C) Br- (D)I (E) -OH (A) CH,CI (B) CH,Br (O) CH,CH,CH,Br (D) (CH)CHBr E) (CH,)CBr (A) CH,OH (B)CHC (C) CH,CH,CH.OH (D) HO (E) CH,Cl (A) CH CU NBS (B) CH,BrFeBr (C) H,O CHCI (D) CH,CI/AICI ()CHC /light (A) NO,, CH,, OH (B) CL, NH, COOH (C.)L, SO,H, OH (D)OCH, CI, COCH (B) Br, CH,CH, N 13. Which of the following reagent(s) can be used to prepare toluene from benzene 14. Which of the following functional groups are o,p-directing ? 15. Which of the following is the electrophile in the Friedel-Craft acylation reaction (A) RCO (B) RCO (C) CO (D) RX/H SO (E) RCO

Explanation / Answer

1. Ans C),CH3I

Methyl and primaryhalides will undergo this reaction by SN2 mechanism.

I-, Br- > Cl-

Here iodine is good leaving group than others.

2. Ans : C) KMnO4

   KMnO4   is used to prepare benzoic acid from toluene.

3. Ans : A). Carbonium ion

Intermediate in the SN1mechanism is Carbonium ion

4. Ans : D) Carbon with 5 bonds

Transition state i the SN2 mechanism is a carbon with 5 bonds.

5. Ans : D) NBS/CCl4

Allylic C-H bond has the least strength therefore this will replace by halogen using NBS.

6. Ans : C) C6H5NH2

7. Ans : B) RX concentration

The rate of SN1 rection os proportional to RX concentration.

8. Ans : D) E2

9. Ans : A) 2

10. Ans : D) I-

11. Ans : E) (CH3)3CBr

12. Ans : D) H2O

13. Ans : D) CH3Cl/AlCl3

14. Ans : E) Br, CH2CH3, NH2

15. Ans : A) RCO+

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