Organic Chemistry Quiz

1 >>IUPAC name of carbonyl chloride is: ?

(A) Phosgene
(B) Chloromethanoyl chloride
(C) Dichloroketone
(D) Dichloromethanone

2 >>How many carbons are in simplest alkyne having two side chains? ?

(A) 5
(B) 6
(C) 7
(D) 8

3 >>The compound name trichloroethene is: ?

(A) Westron
(B) Perclene
(C) Westrosol
(D) Orione

4 >>On evaporation of an aqueous solution of ammonium cyanate, we get urea. This is the class of reaction known as: ?

(A) Polymerization
(B) Isomerization
(C) Association
(D) Dissociation

5 >>Which is not found in alkenes? ?

(A) Chain isomerism
(B) Geometrical isomerism
(C) Metamerism
(D) Position isomerism

6 >>The compound C₄H₁₀O can show: ?

(A) Metamerism
(B) Functional isomerism
(C) Positional isomerism
(D) All the types

7 >>The least number of carbon atoms for an alkane to show stereoisomerism is: ?

(A) 2
(B) 3
(C) 4
(D) 5

8 >>The isomerism observed in alkanes is: ?

(A) Metamerism
(B) Chain isomerism
(C) Position isomerism
(D) Geometrical isomerism

9 >>The optical isomerism is shown by: ?

(A) Oxalic acid
(B) Benzoic acid
(C) Acetic acid
(D) Lactic acid

10 >>A similarity between optical and geometrical isomerism is: ?

(A) Each forms equal number of isomers for a given compound
(B) If in a compound, one is present, then so is the other
(C) Both are included in stereoisomerism
(D) They have no similarity

11 >>The number of stereoisomers possible for a compound of the molecular formula CH₃ − CH = CH − CH(OH) − Me is: ?

(A) 3
(B) 2
(C) 4
(D) 6

12 >>Which of the following does not show geometrical isomerism? ?

(A) 1,2−dichloro−1−pentene
(B) 1,3−dichloro−2−pentene
(C) 1,1−dichloro−1−pentene
(D) 1,4−dichloro−2−pentene

13 >>Ninhydrin has 3 keto groups. Which keto group is expected to be hydrated more easily? ?

(A) 2
(B) 3
(C) 1
(D) All equally

14 >>Bayer angle strain in cyclobutane will be: ?

(A) 22.44^o
(B) 90^o
(C) 9.4^o
(D) 0.44^o

15 >>Which of the following is a true statement? ?

(A) RCOOH is more stable than RCOO⁻
(B) RCOO⁻ is more stable than RCOOH
(C) RCOO⁻ and RCOOH do not show resonating structures
(D) All of the above

16 >>The electron attracting species in the following are: ?

(A) −CN
(B) −NH₂
(C) −NHR
(D) −NHCOR

17 >>pK_a values of HCN, CH₃COOH and HF respectively are 9.2, 4.7 and 3.2. Evaluate pK_b for CN⁻, CH₃COO⁻ and F⁻. ?

(A) 9.2, 4.7, 16.0
(B) 4.8, 9.3, 10.8
(C) 7.2, 3.7, 3.2
(D) 2.2, 2.3, 3.8

18 >>2,3−dibromobutane, when heated with zinc dust yields: ?

(A) 2−butene
(B) 2−butyne
(C) 1−butane
(D) Butane

19 >>2−pentyne can be converted into trans−pent−2−ene by reaction with: ?

(A) H₂⁄Ni
(B) H₂⁄Lindlar′s catalyst
(C) Na⁄liq. NH₃
(D) Zn⁄HCl

20 >>Which of the following compounds has the highest melting point? ?

(A) n−butane
(B) n−pentane
(C) n−hexane
(D) n−heptane

21 >>Which of the following compounds has the highest boiling point? ?

(A) Ethene
(B) Propene
(C) cis−2−butene
(D) trans−2−butene

22 >>The reaction of toluene with Cl₂ in presence of FeCl₃ gives predominantly: ?

(A) m−chlorobenzene
(B) Benzoyl chloride
(C) Benzyl chloride
(D) o− and p−chlorotoluene

23 >>Which one of the following conformations of cyclohexane is chiral? ?

(A) Boat
(B) Twist boat
(C) Rigid
(D) Chair

24 >>Octane number can be changed by: ?

(A) Isomerization
(B) Alkylation
(C) Cyclisation
(D) All of these

25 >>An unknown compound A has the formula C₄H₆. When A is treated with excess of Br₂, a new compound B is formed with formula C₄H₆Br₄. A also gives white ppt. with Tollen′s reagent. The compound A may be: ?

(A) But−1−yne
(B) But−2−yne
(C) But−1−ene
(D) But−2−ene

26 >>Xylene on treatment with Br₂⁄FeBr₃ gives only one product. Xylene was: ?

(A) o−xylene
(B) m−xylene
(C) p−xylene
(D) Not possible

27 >>The name fire damp is given to: ?

(A) Methane
(B) Ethane
(C) Propane
(D) Butane

28 >>In which of the following compounds, addition of HBr in presence and absence of peroxide will have no effect? ?

(A) 1−butene
(B) 2−butene
(C) Isobutene
(D) 2−pentene

29 >>Anti Markownikov′s addition of HBr is not observed in: ?

(A) Propene
(B) But−1−ene
(C) But−2−ene
(D) Pent−3−ene

30 >>18 C−H and 7 C−C sigma bonds are present in: ?

(A) n−heptane
(B) Cyclohexane
(C) 3,3−dimethyl pentane
(D) 2,2,3−trimethyl pentane

31 >>Periodic acid oxidises: ?

(A) 1,4−diols
(B) 1,3−diols
(C) 1,2−diols
(D) β−ketoaldehyde

32 >>Which of the following is the most suitable method for removing the traces of water from ethanol? ?

(A) Heating with sodium metal
(B) Passing dry HCl gas through it
(C) Distilling it
(D) Reacting with Mg

33 >>Oxymercuration−demercuration reaction of 1−methyl cyclohexene gives: ?

(A) trans−2−methyl cyclohexanol
(B) cis−2−methyl cycloheaxanol
(C) 1−methyl cyclohexanol
(D) Mixture of cis− and trans−2−methyl cyclohexanol

34 >>The function of ZnCl₂ in Lucas test for alcohols is: ?

(A) To act as acid catalyst and react with HCl to form H₂ZnCl₄
(B) To act as base catalyst and react with NaOH to form Na₂Zn(OH)₄
(C) To act as amphoteric catalyst
(D) To act as neutral catalyst

35 >>In water, H−O−H bond angle is 104.5^o, but in ethers (R−O−R), the C−O−C bond angle is about 110^o. The reason to justify it, is: ?

(A) Positive inductive effect of alkyl groups is more than that of hydrogen
(B) The alkyl group is polar, while hydrogen is not
(C) Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups
(D) The hybridisation of oxygen atoms is different in ethers and in water

36 >>An aromatic ether is not cleaved by HI even at 525 K. The aromatic ether is: ?

(A) C₆H₅OCH₃
(B) C₆H₅OC₆H₅
(C) C₆H₅OC₃H₇
(D) Tetrahydrofurane

37 >>In a reaction, RCHO is reduced to RCH₃ using amalgamated zinc and conc. HCl, and warming the solution. The reaction is known as: ?

(A) Meerwein−Ponddorf reaction
(B) Clemmensen reaction
(C) Wolff−Kishner reaction
(D) Schiff reaction

38 >>The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is: ?

(A) p−nitrobenzaldehyde
(B) p−hydroxybenzaldehyde
(C) Benzaldehyde
(D) Phenylacetaldehyde

39 >>A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives: ?

(A) Benzyl alcohol and sodium formate
(B) Sodium benzoate and methyl alcohol
(C) Sodium benzoate and sodium formate
(D) Benzyl alcohol and methyl alcohol

40 >>The correct order of acidic strengths of the carboxylic acids is: ?

(A) Formic acid < Benzoic acid < Acetic acid
(B) Formic acid < Acetic acid < Benzoic acid
(C) Acetic acid < Formic acid < Benzoic acid
(D) Acetic acid < Formic acid < Benzoic acid

41 >>The heat of hydrogenation of benzene is 50 kcal⁄mol. The resonance energy of benzene is 36 kcal⁄mol. The heat of hydrogenation of cyclohexene is approximately: ?

(A) 9 kcal⁄mol
(B) 19 kcal⁄mol
(C) 29 kcal⁄mol
(D) 27 kcal⁄mol

42 >>Elimination of bromine from 2−bromobutane results in the formation of: ?

(A) Equimolar mixture of 1− and 2−butene
(B) Predominantly 2−butene
(C) Predominantly 1−butene
(D) Predominantly 2−butyne

43 >>Electrolysis of cold concentrated aqueous solution of potassium succinate yields: ?

(A) Ethane
(B) Ethyne
(C) Ethene
(D) Ethane−1,2−diol

44 >>1,2−dibromopropane on treatment with X moles of NaNH₂ followed by treatment with ethyl bromide gave pentyne. The value of X is: ?

(A) 1
(B) 2
(C) 3
(D) 4

45 >>When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces: ?

(A) β−chlorovinyldichloroarsine
(B) Lewisite
(C) Nitrobenzene
(D) Both (1) and (2)

46 >>Which of the following will undergo metasubstitution on monochlorination? ?

(A) Ethoxybenzene
(B) Chlorobenzene
(C) Ethylbenzoate
(D) Phenol

47 >>The reaction of cis−2−butene with CH₂I₂ and Zn (Cu) to give cis−1,2−dimethyl cyclopropane is: ?

(A) Stereospecific reaction
(B) Enantiospecific reaction
(C) Diastereoselective reaction
(D) Regioselective reaction

48 >>2−methylbutane on reacting with bromine in the presence of sunlight gives mainly: ?

(A) 1−bromo−3−methylbutane
(B) 2−bromo−3−methylbutane
(C) 2−bromo−2−methylbutane
(D) 1−bromo−2−methylbutane

49 >>Acid catalysed hydration of alkenes except ethene leads to the formation of: ?

(A) Mixture of secondary and tertiary alcohols
(B) Mixture of primary and secondary alcohols
(C) Secondary or tertiary alcohol
(D) Primary alcohol

50 >>Benzene hexachloride is prepared from benzene and chlorine in sunlight by: ?

(A) Subsitution reaction
(B) Elimination reaction
(C) Addition reaction
(D) Rearrangement

51 >>Reaction of t−butyl bromide with sodium methoxide produces: ?

(A) Isobutane
(B) Isobutylene
(C) Sodium t−butoxide
(D) t−butyl methyl ether

52 >>One of the following that can not undergo dehydrohalogenation is: ?

(A) Iso−propyl bromide
(B) Ethanol
(C) Ethyl bromide
(D) None of these

53 >>Which of the following statements is true when (CCl₃)₃−OH reacts with Lucas reagent? ?

(A) Cloudiness appears immediately
(B) Cloudiness appears within 10 minutes
(C) Cloudiness will not appear at room temperature
(D) Ketone will be formed in this reaction

54 >>Ether is obtained by the reaction of ethyl alcohol and H₂SO₄ at: ?

(A) 474 K
(B) 383 K
(C) 413 K
(D) 273 K

55 >>The correct order of increasing boiling points is: ?

(A) Isobutane < n−butane < n−butyl chloride < n−butanol
(B) Isobutane < n−butyl chloride < n−butane < n−butanol
(C) n−butane < n−butanol < n−butyl chloride < isobutane
(D) n−butane < isobutane < n−butyl chloride < n−butanol

56 >>The reaction of HCOOH with conc. H_{SO₄ gives: ?}

(A) CO₂
(B) CO
(C) Oxalic acid
(D) Acetic acid

57 >>Alkaline or acid hydrolysis of CH₃COCl is nothing but: ?

(A) Electrophilic substitution
(B) Nucleophilic substitution
(C) Free radical substitution
(D) Biradical substitution

58 >>An organic compound gives a fruity smell. The compound on distillation in presence of dilute alkali yields a product capable of giving positive iodoform test. The compound is: ?