c. Suppose Σ = {a,b,c,d} Which of the following are legitimate strings (why?): (i) λabc (ii) abbc (iii) abae (iv) aλbλcλdλ
The language must contain characters a,b,c,d only the symbol lambda is used to represent empty character and valid character. The strings containing any other characters are invalid.
(i) λabc -- valid , all characters are allowed
(ii) abbc --valid, all characters are allowed in language
(iii) abae --INVALID , Because the character "e" is invalid
(iv) aλbλcλdλ --valid
c. Suppose Σ = {a,b,c,d} Which of the following are legitimate strings (why?): (i) λabc (ii)...
19. Which of the following molecules are achiral? A) II, III B) I, II C) I, IV D) III, IV 20. How many stereogenic centers are present in ephedrine, a bronchodilator and decongestant? ephedrine A) 0 B) 1 C) 2 D) 3 21. Rank the following groups in order of decreasing priority according to the Cahn-Ingold- Prelog system. -NH2 -NHCH3 -CH2NH2 CH2NHCH3 п V . A) B) I>II> III > IV II >I>IV > III II C II >I> III...
Which of the following compounds is least acidic? a. I b. II c. III d. IV e. V HBr HCI NH3 ?? IV
.081) D) II and IV C) I and III B) II and III A) I and II anti H н н. H H H H 6 Which of the following are gauche conformers of butane? H. H но H
+ion OAL, 5) Which of the following structures contains an alkene? A)1 B) II C) III D) IV 6) Which of the following is a secondary alcohol? OH HO B) II AT D) IV C) III 7) Rank the following compounds in order of increasing strength of intermolecular forces, putting the molecule with the weakest intermolecular force first OH A) I II B) I<IIIIIC III ) II<I<III ) IIIII< I D 8) Which of the following compounds has the highest...
5. Which one of the following is nonaromatic? III IV I II A. IV B. I C. II D. III E. None 6. Which is the correct bond order for the C-C bonds in benzene? 1.0 20 1.25 1.75 1.5 1.5 20 10 A. III B. C. IV D. II E. None
11. Identify the product(s) of the following reaction. A. I B. II C. III D. IV E. V Gom Do is a From co be on) porno porno olyan 12. What is the final product obtained when toluene is subjected to the following reaction sequence? i) Clz (large excess), heat, hv; ii) OH-/H20, heat; iii) H30+ A. I OH B. II OH COH C. III U OH D. IV E. V I II Hol YCC, III HOCCI3 C/ стон с...
1. Which of the following structures is/are a secondary alkyl
halide? (a) I and II (b) II and V (c) I, II and V (d) IV only (e)
I, II and III 2. Which of the following is/are aprotic solvent(s)?
Choose all correct answers. (a) (b) (c) (d) (e) (f) 3. Which of the
following carbocations, if formed, is (are) likely to undergo
rearrangement through a hydride shift? (a) I (b) II (c) III (d) I
and II (e) II...
Predict the product for the fallowing reaction. A) I B) II C) III D) IV E) none of these Predict the major product for the following reaction. A) I D) II C) III D) IV E) none of these
A. two B. four C. six D. eight 15. Which one of the following compounds has highest boiling point? I. CH3CH2CH3 II. CH3CH2OH III. CHOCH A. I B . II C. III 16. What occurs when an optically active alcohol reacts with HBr to give an alkyl halide? A complete inversion of configuration takes place at the chirality center B. incomplete and varying inversion of configuration takes place at the chirality center C. the chirality center retains its configuration D....
) Which of the following is aromatic? IV. V. A) 1 B) II C) III D) IV E) V