Question. The reaction of toluene with Cl2 in presence of FeCl3 gives ‘X’ while theof toluene with Cl2in presence of light gives ‘Y’. Thus ‘X’ and ‘Y’ are:(a) X = benzyl chloride Y = o and p – chlorotoluene(b) X = m – chlorotoluene Y = p – chlorotoluene(c) X = o and p–chlorotoluene Y […]

Question. Metal M ions form a ccp structure. Oxide ions occupy 1⁄2 octahedral and 1⁄2 tetrahedral voids. What is the formula of the oxide?(a)MO(b)MO2(c)MO3(d) M2O3 Answer: (d) M2O3 Metal M ions form ccp structure. Let number of ions of M be : XNo. of tetrahedral voids = 2xNo. of octahedral voids = xNumber of oxide

Question. Which of the following has highest ionisation enthalpy?(a)Nitrogen(b)Phosphorus(c)Oxygen(d)Sulphur Answer: (a)Nitrogen (High IE of N is because of smallest size in the group and completely half – filled p subshell)

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)