Organic + Physical 1 / 29Which of the following reactions is characteristic of alkanes? a) Electrophilic substitution b) Nucleophilic addition c) Free radical substitution d) Elimination 2 / 29Which of the following is the most reactive towards electrophilic substitution? a) Benzene b) Toluene c) Nitrobenzene d) Chlorobenzene 3 / 29Which of the following alkyl halides will undergo SN2 reaction most readily? a) Tertiary butyl bromide b) Isopropyl chloride c) Methyl iodide d) Neopentyl bromide 4 / 29Which of the following conditions favors an E2 mechanism? a) Weak base and polar protic solvent b) Strong base and polar aprotic solvent c) Weak base and polar aprotic solvent d) Strong base and polar protic solvent 5 / 29Lucas reagent is used to distinguish between: a) Primary, secondary, and tertiary alcohols b) Alcohols and phenols c) Aldehydes and ketones d) Alkanes and alkenes 6 / 29Phenol is more acidic than alcohols due to: a) Hyperconjugation b) Resonance stabilization of the phenoxide ion c) Inductive effect of the hydroxyl group d) Steric hindrance 7 / 29Williamson ether synthesis involves: a) Reaction of an alkoxide ion with an alkyl halide b) Dehydration of alcohols c) Oxidation of alkenes d) Hydrolysis of esters 8 / 29Which reagent is used to distinguish between aldehydes and ketones? a) Fehling's solution b) Tollens' reagent c) Both a and b d) Lucas reagent 9 / 29The strongest acid among the following is: a) Formic acid b) Acetic acid c) Chloroacetic acid d) Benzoic acid 10 / 29Carboxylic acids can be reduced to primary alcohols using: a) LiAlH₄ b) NaBH₄ c) PCC d) KMnO₄ 11 / 29Which of the following compounds exhibits optical isomerism? a) 2-Chlorobutane b) 1-Chlorobutane c) 2-Chloropropane d) 1-Chloropropane 12 / 29Which of the following is true for enantiomers? a) They have the same melting point b) They rotate plane-polarized light in opposite directions c) They have the same boiling point d) All of the above 13 / 29Which of the following statements is true about the Beer-Lambert law? a) It is only applicable to UV-Vis spectroscopy b) It assumes monochromatic light c) It is not valid for dilute solutions d) It does not depend on the path length 14 / 29Bragg's law is given by the equation: a) nλ = 2d sinθ b) E = hν c) c = λν d) ΔE = hc/λ 15 / 29In XRD, the intensity of the diffracted beam depends on: a) The atomic number of the atoms b) The crystal structure c) The wavelength of the X-rays d) All of the above 16 / 29In mass spectrometry, the base peak corresponds to: a) The peak with the highest m/z value b) The peak with the lowest m/z value c) The most intense peak in the spectrum d) The peak representing the molecular ion 17 / 29The splitting pattern of a proton signal in ^1H NMR is determined by: a) The number of adjacent protons b) The applied magnetic field c) The chemical shift d) The relaxation time 18 / 29Which of the following factors does NOT affect the vibrational frequency of a bond in IR spectroscopy? a) Bond strength b) Mass of the atoms c) Polarity of the bond d) External magnetic field 19 / 29Which of the following transitions is responsible for absorption in the UV-Vis region? a) σ → σ* b) n → π* c) π → π* d) Both b and c 20 / 29Which of the following solutions will have the highest boiling point? a) 0.1 M NaCl b) 0.1 M glucose c) 0.1 M CaCl2 d) 0.1 M AlCl3 21 / 29The decay of 238U to 206Pb involves the emission of how many alpha particles? 6 8 10 12 22 / 29A reaction has a rate constant k=2.3×10−3 s−1 at 25°C. What is the order of the reaction? a) Zero order b) First order c) Second order d) Third order 23 / 29The half-life of a radioactive isotope is 5 years. What fraction of the original sample will remain after 15 years? a) 1/2 b) 1/4 c) 1/8 d) 1/16 24 / 29During electrolysis of molten NaCl, the product formed at the cathode is: a) Chlorine gas b) Sodium metal c) Hydrogen gas d) Oxygen gas 25 / 29In potentiometric titrations, the equivalence point is determined by: a) A sudden change in pH b) A sudden change in conductivity c) A sudden change in potential d) A sudden change in temperature 26 / 29Which of the following electrodes is commonly used as a reference electrode in voltammetry? a) Glass electrode b) Calomel electrode c) Platinum electrode d) Gold electrode 27 / 29The half-life of a first-order reaction is 10 minutes. What is the rate constant (k) for the reaction? a) 0.0693 min⁻¹ b) 0.693 min⁻¹ c) 6.93 min⁻¹ d) 69.3 min⁻¹ 28 / 29Le Chatelier's principle predicts that increasing the pressure of the system 2SO2(g)+O2(g)⇌2SO3(g) will: a) Shift the equilibrium to the left b) Shift the equilibrium to the right c) Have no effect on the equilibrium d) Increase the temperature 29 / 29The van't Hoff factor (i) for a 0.1 M solution of K₃[Fe(CN)₆] assuming complete dissociation is: 1 2 3 4 Your score isThe average score is 0% 0% Restart quiz
