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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An oxy acid of phosphorus has the following properties. Complete neutralization of the acid with sodium hydroxide solution gives an aqueous solution of sodium ions and oxy acid anions in the ratio 2 : 1. When a solution of acid is warmed with silver nitrate solution metallic silver is deposited.pH of 0.01 M solution of the sodium salt of this acid formed (assume pK_(a) = 2x) is |
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Answer» `6 + 2X` |
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| 2. |
An oxyacid of sulphur contained S = S linkage and the oxidation number of S in it is +6 and -2. It belongs to |
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Answer» `-`OUS series |
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| 3. |
An oxy acid of phosphorus is a white deliquescent crystalline solid. It can be prepared by the hydrolysis of P_(2)O_(3) or PCl_(3) and its formula is : |
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Answer» `H_(3)PO_(4)` `P_(4)O_(6)+6H_(2)Orarr 4H_(3)PO_(3)` |
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| 4. |
An oxime (A) has two geometrical isomers when a mixture of both geometrical isomers is heated with conc. H_(2)SO_(4) them following two amides C and D are obtained underset((70%))(Ph-NH-overset(O)overset(||)(C)-CH_(3))""CH_(3)-underset((30%))overset(..)(N)H-overset(O)overset(||)(C)-PhNow, in the mixture, amount of which of the following geometrical isomers were more? |
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| 5. |
An oxidising agent is a substance which |
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Answer» oxygen from air is dissolved in the water which makes the water acidic |
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| 6. |
An oxide that gives hydrogen perioxide on treatment with dilute H_(2)SO_(4) is : |
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Answer» `SnO_(2)` |
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| 7. |
An oxide of transition metal that shows paramagnetism is |
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Answer» `CrO_(2)` |
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| 8. |
An oxide of sulphur contains 50%S. What will be the empirical formula : |
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Answer» SO |
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| 9. |
An oxide of nitrogen has the percentage composition : Fe = 36.76 , S = 21.11 and O = 42.14 Calculate the empirical formula of the compound. (At. Mass Fe = 56, S = 32 and O = 16) |
| Answer» SOLUTION :`N_(2)O_(5)` | |
| 10. |
An oxide of nitrogen exists is equilibrium with its dimer. At low temperature, the oxide exists almost entirely as the pale yellow solid. As temperature is increased, the colour darkens, the dissociation is complete at 150^@C and the colour of gaseous matter becomes black. Further increase in temperature results in a loss of colour. The oxide of nitrogen is |
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Answer» `N_(2)O_5` |
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| 11. |
An oxide of N has vapour density 46. Total number of electron in 92 g are |
| Answer» ANSWER :A | |
| 12. |
An oxide of metal (at . Wt = 112) contains 12.5% of oxygen by weight. What is the valency of metal? What mass of the metal will be liberated when the oxide is converted to chloride with HCl and electrolysed using a current of 9.65 amp for a period of 30 min? |
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Answer» Solution :Equivalent of oxygen `=` Equivalent of metal `(12.5)/(8) = (87.5)/(E)`, where E is the equivalent WEIGHT of metal, `E=56`. Valency ofmetal `=` At. wt./Eq. wt. `=112//56=2` Mass of the metal DEPOSITED `=(E XX i xx t)/(96500)` Substituting the values `=(56xx9.65xx30xx60)/(96500)` Mass of metal `=10.08` G |
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| 13. |
An oxide of metal ("at. wt. "= 112) contain 12.5% O_(2) by weight. The oxide was converted into chloride by treatment with HCl and electrolsed. Calculate the amount of metal that would be deposited at cathode if a current of 0.965 ampere was passed for a period of 5hr. What is valency of metal ? |
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| 14. |
An oxide of copper which is red in colour has the formula: |
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Answer» `CUO` |
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| 15. |
An oxide of a non-metal has the following properties. (i) It acts both as a proton donor as well as a proton acceptor. (ii)It reacts readily with basic and acidic oxides. (iii)It oxidises Fe at its boiling point. (iv) Itis a poor conductor of electricity. The oxide is |
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Answer» `H_(2)O` |
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| 16. |
An ornanic compound (A) with molecular formula C_6H_7N gives (B) with HNO_2"/"HCl at 273 K. The aqueous solution of (B) on heating gives compound (C ) which gives violet colour with netural FeCl_3. Identify the compounds (A),(B) and (C ) and write the equations. |
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Answer» Solution :(I) An ORGANIC compound (A) with molecular formula `C_6H_7N` is identified as Aniline `C_6H_5NH_2` (ii) Aniline on treatment with `HNO_2"/"HCl` at 273K gives a clear solution of Benzene diazonium chloride `C_6H_5N_2Cl` the compound (B). `{:(C_6H_5NH_2+HNO_2underset(273K)OVERSET(HCl)(to)C_6H_5N_2Cl),("Benzene diazonium chloride"):}` (III) An aqueous solution of benzene diazonium chloride on heating gives phenol `C_6H_5OH` and it is compound (C ). `C_6H_5N_2Cl+HOHoverset(triangle)(to)C_6H_5OH+N_2+HCl` 
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| 17. |
An orgnaic acid P(C_(11)H_(12)O_(2)) can easily be oxidized to a dibasic acid which reacts with ethyleneglycol to product a polymer dacron. Upon ozonolysis, P gives an aliphatic ketone as one of the products. P undergoes the following reaction sequences to furnish R via Q. the compound P also undergoes another set of reactions to produce S. Sunderset((4)." "CHCl_(3),KOH,Delta,(5)." "H_(5)//Pd-C)overset((1)." "H_(2)//Pd-C,(2)." "NH_(3)//Delta,(3)." "Br_(2)//NaOH)larrPunderset((3)." "MeMgBr,CdCl_(2),(4)." "NaBH_(4))overset((1)." "H_(2)//Pd-C,(2)" "SOCl_(2))toQunderset((3)." "CO_(2),("dry ice"),(4)." "H_(3)O^(+)) overset((1)." "HCl,(2)." "Mg//Et_(2)O)to Q. The compound S is |
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| 18. |
An ornamental ring contains 275 carats of diamond. How many grams diamond does it have? |
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Answer» Solution :1 carat=200mg `THEREFORE` MASS of diamond `=275xx200xx10^(-3)G` |
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| 19. |
An organs substance (M=169 gram "mol"^(-1)) is dissolved in 2000 "cm^(3) of water. Its osmotic pressure at 12^(@)C was found to be 0*54atm. If R=0*0821L atm. K^(-1) mol^(-1), calculate the mass of the solute. Calculate the number of atoms in a unit cell of a metal crystalling in face centered cubic structure. Distinguish between isothermal process and adiabatic process. Mention the names of various steps involved in the extraction of pure metals from their ores. |
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Answer» Solution :`M=169` gm /mol Vol. of solvent `=200 cm^(3)=2L` `pi=0-54` `T=12^(@)C=12+273=285K` `R=0*0821L atm K^(-) "mol"^(-1)` `m=?` `pi V= n RT` `0*54xx2=(m)/(169)xx0*-082xx285` `m=(0*54xx2xx169)/(0*082xx285)` `=(182*52)/(23*37)=7*8g` No. of atoms situated at 8 corners of unit cell of fcc type `(1)/(8)xx8=1` No. of atoms on each sphere `=(1)/(2)` Total no. of sphere PRESENT in each faces of unit cell `(1)/(2)xx6=3` Thus, total spheres present in fcc type `=1+3=4`  Various stpes involved in the extraction of pure metals from their ORES are: (a) Concentration of ores. (b) Conversion of ores into OXIDES. (c) Reduction of ores to form crude metals. (d) Refining of metals. |
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| 20. |
An organtiic compound (A) contains C = 92.3% and H = 7.7% Its vapour density has been found to be 52.(A) is oxidised by KMnO_(4) soltuion in cold and when fullyoxidisedgives an acid (B)which containsC = 68.8%and H = 4.9% (A) reacts with bromicand yields a comnpound (C) containing60.8%bromine. What is the structer of (A) ? |
Answer» Solution : Emprical formula `= CH` MOLECULAR mass `= 2xx VD = 104` Empirical formula mass `= 13` `n = (104)/(13) = 8` Molecular formulaof `(A) = C_(8) H_(8)` `D.U` in `(A) = 5^(@)`and `(C:H = 1:1)` `(A)` contains benzene RING withone `(C=C)` in the side chain. `(A)` is `Ph -CH = CH_(2)` (Styrene) Reaction:  Molecular formula of `(B)`  Molecular formula of`(B) = C_(7) H_(6)O_(2)` |
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| 21. |
An organic veolved from the treatement of 0.30g ofan organiccompound for the estimationfor the of nitrogen was passed in100mlof 0.1 M sulphuricacid. The excess of acid required 20ml of 0.5 M sodium hydroxide solution for complete neutralization . The organic compound is |
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Answer» `CH_(3NXO` |
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| 22. |
An organie compound (A) of molecular formula C_6H_6O gives violet colour with neutral FeCl_3.(A) reacts benzene diazonium chloride in basic medium to give (B) as an azo dye. (A) reacts with acidified K_2Cr_2O_7 gives (C) of fornmula C_6H_4O_2. (A)on reaction with H, in the presence of nickel gives (D) of formula C_6H_12O.Identify A, B, C, D and explain the reaction involved. |
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Answer» SOLUTION :(i)(A) of molecular formula `C_6H_6O` gives VIOLET colour with neutral `FeCl_3` means it must be Phenol - `C_6H_5OH`. (ii) Phenol couples with benzene diazonium chloride in the PRESENCE of basic medium to PRODUCE p-hydroxy azo benzene, a red ORANGE dye as (B).  (ii) Phenol on reaction with acidified `K_2Cr_2O_7` undergoesoxidation reaction to give 1,4-benzo quinone as (C).  (iv) Phenol on reaction with H2, in the presence of Nickel gives cyclohexanol as (D). 
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| 23. |
An organic substance from its aqueous solution can be separated by : |
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Answer» SOLVENT extraction |
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| 24. |
An organic reaction is carried out at 500 K. If the same reaction carried out in the presence of a catalyst at the same rate, the temperature required is 400 K. What is the activation energy of the uncatalysed reaction if catalyst lowers the Ea by 20 kJ/mol? |
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Answer» 110 kJ/MOL According to QUESTION, `K_(500)=K_(400)` `:.""(E_(1))/(RT_(1))=(E_(2))/(RT_(2))""IMPLIES""(E_(2))/(E_(1))=(T_(2))/(T_(1))=(4)/(5)` Also, `E_(1)=E_(2)+20000" J"` So, `(E_(1)-20000)/(E_(2))=(4)/(5),""E_(1)=100,000J=100kJ//"mol"` |
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| 25. |
An organic monoprotic acid [0.1M] is titrated against 0.1 M NaOH. By how much does the pH change between one fourth and three fourth stages of neutralization ? If at one third stage of neutralization, the pH is 4.45 what is the dissociation constant of the acid? Between what stages of neutralisation may the pH change by 2 units ? |
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| 26. |
An organic nitrogen compound …………………is used as an insecticide. |
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Answer» |
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| 27. |
An organic molecule necessarily shows optical activity if it |
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Answer» contains asymmetric CARBON atom |
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| 28. |
An organic molecule belonging to the category of schiff's base is subjected to reduction. The product of the reaction will be |
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Answer» aniline |
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| 29. |
An organic liquid rises 2.0 cm in a capillary tube. How much will it rise if the cross-sectional area of the tube is doubled? |
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Answer» 2.0 CM |
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| 30. |
An organic liquid rises 1.0 cm in a capillary tube of radius r. How much will it rise if the cross-sectional area of the tube is halved? |
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| 31. |
An organic liquid, A is immiscible with water. When boiled together with water, the boiling point is 90^(@)C which the partial vapour pressure of water is 256 mm Hg. The superincumbent (atmospheric) pressure is 736 mm Hg. The weight ratio of the liqid water collected 2.5:1. What is the molecular weight of the liquid. |
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| 32. |
An organic liquid A containing C,H and O has a pleasand odour with a b.pt.of 78^0C. On boiling A with conc.H_2SO_4 a colourless gas is produced which decolourises bromine water and alkaline KMnO_4.One mole of this gas also takes one mole of H_2 . The organic liquid A is : |
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Answer» `C_2H_5Cl` |
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| 33. |
An organic liquid having carbon, hydrogen, nitrogen and oxygen was found to contain C=41.37%, H=5.75%,N=16.09% and the rest oxygen. Calculate the molecular formula of the liquid if its V.D. is 43.3. |
| Answer» Solution :`C_(3)H_(5)NO_(2)` | |
| 34. |
An organic halogen compound which is used as refrigerant in refrigerators and air conditioners is |
| Answer» ANSWER :C | |
| 35. |
An organic liquid A (immiscible with water) when boiled together with water, the boiling point is 90^(@)C at which the partial vapour pressure of water is 526 mm Hg. The atmospheric pressure is 736 mm Hg. The weight ratio of the liquid and water collected is 2.5 : 1. Calculate the molecular weight of the liquid. |
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Answer» <P> Solution :For two immiscible liquid, at the boiling point, ratio of the NUMBER of MOLES of the two liquids in the vapour phase is equal to the ratio of their vapour pressure, i.e.,`(n_(l))/(n_(w))=(p_(l))/(p_(w))"...(i)"` GIVEN, at the boiling point, `p_(w)="526 mm and p"_("total")="736 mm"` `THEREFORE""p_(l)=7360526=210 mm` From eqn. (i), `(W_(l)//W_(l))/(W_(w)//M_(w))=(p_(l))/(p_(w)) or (W_(l))/(W_(w))=(p_(l)xxM_(l))/(p_(w)xxM_(w))""therefore""(2.5)/(1)=(210xxM_(l))/(526xx18) or M_(l)="112.7 g mol"^(-1)` |
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| 36. |
An organic halide was treated with KCN and the product was boiled with dil. HCl to give a compound B. B can be: |
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Answer» An alkane |
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| 37. |
An organic halide was treated with KCN and the product was boiled with dil. HCl to give a compoud B, B can be : |
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Answer» An alkane |
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| 38. |
An organicformulaC_(4)H_(11)N does not reactwithC_(2)H_(5)SO_(2)Cl butreactwith onemoleof methyliodindeto formsalt. Thestructure of 'X is |
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Answer» `CH_(3) - overset(CH_(3))overset(|)(N) - CH_(2) - CH_(3)` |
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| 39. |
An organic dibasic acid (A) gave the following on analysis: C = 57.8%, H = 3.6%. Its silver salt contained 56.8% Ag. On heating (A) gives a product (B) which on heating with NH_(3) gives (C) (C_(8)H_(5)O2N). Compound (C) forms potassium salt with ale. KOH and is converted into a-aminobenzoic acid with NaOCl. Identify (A), (B) and (C) and give the reactions involved. |
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Answer» SOLUTION :(A) is `C_(8)H_(6)O_(4)` , a DIBASIC ACID, `C_(6)H_(4)(COOH)_(2)`. Reactions : 
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| 40. |
An organic dye, cosine used to detect end point of precipitation titration by adsorption is called |
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Answer» Absorptionindicator |
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| 41. |
An organic contains C=40%,O=53.5% and H=6.5% .The empirical formula of the compound is : |
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Answer» `CH_2O` |
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| 42. |
An organic compounds 'X' with the molecular formula C_4H_11 N reacts withC_6H_5 SO_2Cland forms the compound 'Y'.If 'Y' is soluble in alkali ,''X' may be |
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Answer» N-Methyl propanamine |
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| 43. |
An organic compounds 'X' having molecular formula C_(6)H_(5)O_(2)N has 6 carbon atoms in a ring system, two double bonds and also a nitro group as substituent, 'X' is |
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Answer» HOMOCYCLIC but H not armotic |
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| 44. |
An organic compounds 'X' gives foul odour on heating with CHCl_3and alc. KOH. Correct statement (s)among the following is (are) (a)'X' reacts with C_6H_5SO_2Cl give a compound which is insoluble in alkali (b)'X' on reaction with CS_2 followed by treatment with HgCl_2 gives a mustard oil smellcompound (c)'X' on oxidation with KMnO_4 followed by hydrolysis gives a carbonyl compound |
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Answer» a,B and C are CORRECT |
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| 45. |
An organic compounds 'A' with the molecular formula C_4 H_10 O on oxidation with acidified K_2 Cr_2O _7 gives compounds 'B' with the formula C_3 H_6O. Again 'B' on oxidation with acidified K_2 Cr_2O_7 gives,'C' with the molecular formula C_2H_4O_2 . IUPAC name of 'A' is |
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Answer» `a`. 1- BUTANOL |
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| 46. |
An organic compounds n3ecessarily shows optical isomerism of it |
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Answer» contains asymmmetric carbon atoms  Hence, compound having non-super imposable mirror images necesarily shows optial activity |
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| 47. |
An organic compound X(C_5H_10) on ozonolysis gives Y & Z. The product mixture Y and Z on reaction withNH_2-OH gives four oximes.The structure of X is |
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Answer» `CH_3-oversetoverset(CH_2)(||)C-CH_2CH_3` 
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| 48. |
An organic compounds 'X' with the molecular formula C_3H_6O , reacts with CH_3 M g Br and then hydrolised to give 'Y' ,Y gives turbidity immediatelywith Lucas reagent Structural formula of compounds X and Y are : |
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Answer» |
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| 49. |
An organic compound X(C_(4)H_(9)Br) on treatment with alc, KOH gave isomeric product with the formula C_(4)H_(8). On ozonolysis one of these gave only product CH_(3)CHO while the other gave two |
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Answer» 2-bromobutane |
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| 50. |
An organic compound (X) with molecular formula C_(9)H_(10)O gives positive 2, 4-DNP and Tollens'tests.It undergoes Cannizzaro reaction and on vigorous oxidation it gives 1, 4-benzenedicarboxylic acid. Compound (X) is |
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Answer» BENZALDEHYDE 
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