Question

Question. Phenol does not undergo nucleophilic substitution reaction easily due to:(a) acidic nature of phenol(b) partial double bond character of C-OH bond(c) partial double bond character of C-C bond(d)instability of phenoxide ion Answer: (b) partial double bond character of C-OH bond

Question. Which one of the following statement is correct about sucrose :(a) It can reduce tollen’s reagent however cannot reduce fehling’s reagent(b) It undergoes mutarotation like glucose and fructose(c) It undergoes inversion in the configuration on hydrolysis(d) It is laevorotatory in nature . Answer: (c) It undergoes inversion in the configuration on hydrolysis

Question. On partial hydrolysis, XeF6 gives:(a) XeO3 +4HF(b) XeO2F + HF(c) XeOF4+ H2(d) XeO2F2 + 4HF Answer: (d) XeO2F2 + 4HF XeF4 + H2O -> XeO2F2 + 4HF

Question. Which reagents are required for one step conversion of chlorobenzene to toluene?(a) CH3Cl / AlCl3(b) CH3Cl, Na, Dry ether(c)CH3Cl/Fe dark(d) NaNO2/ HCl /0-50C Answer: (b) CH3Cl, Na, Dry ether

Question. How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at– 14°C ? (Kf for water = 1.86°C/mol) (a) 7.5 mol(b)8.5 mol(c)9.5 mol(d)10.5 mol Answer: (a) 7.5 mol

Question. In which of the following cases blood cells will shrink:(a)when placed in water containing more than 0.9% (mass/ volume) NaCl solution.(b)when placed in water containing less than 0.9% (mass /volume) NaCl solution.(c)when placed in water containing 0.9% (mass/volume) NaCl solution.(d)when placed in distilled water. Answer: (a)When placed in water containing more than 0.9% (mass/

Question. Maximum oxidation state exhibited by Chlorine is:(a) +1(b) +3(c)+5(d)+7 Answer: (d)+7 (Cl : 1s22s22p63s23p5)

Question. Lower molecular mass alcohols are:(a)miscible in limited amount of water(b) miscible in excess of water(c) miscible in water in all proportions(d) immiscible in water Answer: (c) miscible in water in all proportions Lower molecular mass alcohols are able to form hydrogen bonds with water

Question. Substance having the lowest boiling point:(a)Hydrogen(b)Oxygen(c)Nitrogen(d) Helium Answer: (d) Helium (He is monoatomic and has low atomic mass)

Question. Which of the following is a polysaccharide?(a)glucose(b)maltose(c)glycogen(d)lactose Answer: (c)glycogen (It is a polymer of glucose)