Explore topic-wise InterviewSolutions in Current Affairs.

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1.	Esters have a ________ odour.
Answer» fishy fruity garlic carbolic Answer :B

2.	Esters are reduced by DIB-Al-H gives
Answer» `-CHO` `gtC=O` `-C EQUIV N` `-COOH` ANSWER :A

3.	Esters are quite soluble in
Answer» ALCOHOL Benzene Both alcohol and benzene Water Answer :C

4.	Esters are formed from acid by the replacement of
Answer» non-ionisable H atom by ALKYL GROUP ionisable H atom by alkyl group OH group by RO group both 'B' and 'c' ANSWER :C

5.	Esters are colourless liquids with characteristic fruity smell. Identify the ester which gives the following flavours. (i) Raspberry (ii) Pine apple (iii) Orange
Answer» SOLUTION :`{:("Flavor","Ester"),((i)"RASPBERRY"" - ","isobutyl formate"),((II)"Pine apple"" - ","ethyl butyrate"),((iii)" Orange"" - ","octyl ACETATE"):}`

6.	Esterification reaction is
Answer» NUCLEOPHILIC substitution ELECTROPHILIC substitution electrophilic ADDITION DEHYDRATION Answer :A

7.	Esters.
Answer» Solution :(1) Esters of BENZOIC acid are used in PERFUMERY. (2) Sodium benzoate is used as FOOD PRESERVATIVE. (3) Sodium or potassium salts of higher FATTY acids are used to prepare soaps or detergents.

8.	Esterification of alcohols involves :
Answer» H of ALCOHOL and OH of acid OH of alcohol and H of acid OH of alcohol and OH of acid H of alcohol and H of acid Answer :A

9.	Ester on reduction by using LiAlH_4 produces
Answer» SINGLE ALDEHYDE single ALCOHOL MIXTURE of aldehyde mixture of alcohol ANSWER :D

10.	Esterification is an example of
Answer» NUCLEOPHILIC ALKYL substitution Nucleophilic ACYL substitution Electrophilic acyl substitution Nucleophilic acyl addition Answer :B

11.	Ester having alpha-hydrogen on treatement with a strong base eg. C_(2)H_(5)Ona undergoes self condensation to produce beta-keto esters. This is called claisen condensation CH_(3)-underset(O)underset(\|\|)(C)-CH_(2)-underset(O)underset(\|\|)(C)-OEt overset((1)C_(2)H_(5)ONa)underset((2)CH_(3)-I)to overset((1)H_(2)O^(-))underset((2)Delta)to
Answer» `CH_(3)-UNDERSET(O)underset(\|\|)(C)-CH_(2)-CH_(3)` `CH_(3)-underset(O)underset(\|\|)(C)-CH_(2)-CH_(2)-CH_(3)` `CH_(3)-underset(O)underset(\|\|)(C)-CH_(3)` `CH_(3)-underset(O)underset(\|\|)(C)-CH_(2)-COOH` SOLUTION :`CH_(3)-underset(O)underset(\|\|)(C)-CH_(2)-underset(O)underset(\|\|)(C)-Oet OVERSET(C_(2)H_(5)O^(o))toCH_(3)-underset(O)underset(\|\|)(C)-overset(o)(C)H-underset(O)underset(\|\|)(C)-Oet overset(CH_(3)I)to CH_(3)-underset(O)underset(\|\|)(C)-overset(CH_(3))overset(\|)(C)H-underset(O)underset(\|\|)(C)-OEt overset(H_(2)O)underset(DELTA)toCH_(3)-underset(O)underset(\|\|)(C)-CH_(2)-CH_(3)`

12.	Ester is not formed in the following reaction. Identify the suitable reaction
Answer» `CH_(3)COOH + C_(2)H_(5)OH OVERSET(H^(+))to` `C_(2)H_(5)OH + CH_(3)COOCOCH_(3) to` `CH_(3)-CH_(2)OH + CH_(3)COCl to` `C_(2)H_(5)OC_(2)H_(5) + CH_(3)CL to` Answer :D

13.	Ester is converted in to mixtrue of 1^(@) and 2^(@) alcohol by using
Answer» `SuCl_(2) + HCl` `H_(2)+Ni` `NaBH_(4)` `Pd . BaSO_(4)+` quinoline Answer :B

14.	Ester having alpha-hydrogen on treatement with a strong base eg. C_(2)H_(5)Ona undergoes self condensation to produce beta-keto esters. This is called claisen condensation EtO-overset(O)overset(\|\|)(C)-OEt+Ph-CH_(2)-overset(O)overset(\|\|)(C)-OC_(2)H_(5) overset((1)C_(2)H_(5)ONa)underset((2)H_(2)O,Delta)to products is
Answer» `CH_(3)-underset(PH)underset(\|)(C)H-COOH` `{:(""CH_(3)),("\|"),(""Ph-C-COOH),("\|"),(""COOH):}` `Ph-overset(O)overset(\|\|)(C)-OEt` `Ph-CH_(2)-COOH` SOLUTION :

15.	Ester having alpha-hydrogen on treatement with a strong base eg. C_(2)H_(5)Ona undergoes self condensation to produce beta-keto esters. This is called claisen condensation C_(6)H_(5)-underset(O)underset(\|\|)(C)-OC_(2)H_(5)+CH_(3)-underset(O)underset(\|\|)(C)-OC_(2)H_(5) overset((1) C_(2)H_(5)overset(Theta)(O)Na^(o+))underset((2) H^(o+))to
Answer» `C_(6)H_(5)-underset(O)underset(\|\|)(C)-CH_(2)-underset(O)underset(\|\|)(C)-OC_(2)H_(5)+C_(2)H_(5)OH` `C_(6)H_(5)-underset(O)underset(\|\|)(C)-O-CH_(2)-underset(O)underset(\|\|)(C)-OC_(2)H_(5)+C_(2)H_(5)OH` `C_(6)H_(5)-underset(O)underset(\|\|)(C)-O-underset(O)underset(\|\|)(C)-OC_(2)H_(5)+C_(2)H_(5)OH` NONE of these Solution :

16.	Ester gives nucleophilic addition reaction followed by elimination reaction with carbon nucleopile. When carbon nucleophile is of an ester then the reaction is known as Claisen condensation reaction. This reaction is also carried out between ester and a ketone. A suC Cessful Claisen condensation requires an ester with two alpha- hydrogens and anequivalent amount of base rather than a catalytic amount of base. In the given reaction [X] is :
Answer» `H-overset(O)overset(\|\|)C-Cl` `HCl+CO` `HCOOC_(2)H_(5)` `{:(COOC_(2)H_(5)),(\|),(COOC_(2)H_(5)):}` ANSWER :C

17.	Ester gives nucleophilic addition reaction followed by elimination reaction with carbon nucleopile. When carbon nucleophile is of an ester then the reaction is known as Claisen condensation reaction. This reaction is also carried out between ester and a ketone. A suC Cessful Claisen condensation requires an ester with two alpha- hydrogens and anequivalent amount of base rather than a catalytic amount of base. In the given reaction : C_(2)H_(5)O-overset(O)overset(\|\|)C-(CH_(2))_(3)-CH_(2)-COOC_(2)H_(5)underset((ii)H_(2)O //HCl)overset((i)C_(2)H_(5)ONa//C_(2)H_(5)OH)rarr[X] [X] is :
Answer» ANSWER :A

18.	Ester gives nucleophilic addition reaction followed by elimination reaction with carbon nucleopile. When carbon nucleophile is of an ester then the reaction is known as Claisen condensation reaction. This reaction is also carried out between ester and a ketone. A suC Cessful Claisen condensation requires an ester with two alpha- hydrogens and anequivalent amount of base rather than a catalytic amount of base. Intramolecular Claisen condensation given diester is known as :
Answer» Stobbe condensation Dieckmann condesnation Mannich REACTION Reformatsky reaction ANSWER :B

19.	Ester gives nucleophilic addition reaction followed by elimination reaction with carbon nucleopile. When carbon nucleophile is of an ester then the reaction is known as Claisen condensation reaction. This reaction is also carried out between ester and a ketone. A suC Cessful Claisen condensation requires an ester with two alpha- hydrogens and anequivalent amount of base rather than a catalytic amount of base.Consider the given reaction CH_(3)-COOC_(2)H_(5)underset(C_(2)H_(5)OH)overset(C_(2)H_(5)ONa)rarr"enolate ion"underset("Claisen condensation")overset("ether(X)")rarr Product For the above reaction the most reactive ester is :
Answer» `C_(6)H_(5)COOC_(2)H_(5)` `C_(2)H_(5)O-overset(O)overset(\|\|)C-overset(O)overset(\|\|)C-OC_(2)H_(5)` `HCOOC_(2)H_(5)` `C_(2)H_(5)O-overset(O)overset(\|\|)C-OC_(2)H_(5)` ANSWER :B

20.	Ester given nucleophilic additionreactionfollowed by eliminationreaction withcarbon nucleophile . Whencarbon nucleophileis of anesterthenthe reactionis knowas Claisencondensationreaction. This reactions is alsocarrieout betweenester and aketone. Asuccessful Claisencondensationrequires an ester withtwo alpha- hydrogensand aan equivalentamountof base ratherthan acatayticamount of base . In the givereaction. C_(2)H_(5)O - overset(O)overset(\|\|)(C) - (CH_(2))_(5) - CH_(2) - COOC_(2)H_(5) underset((ii) H_(2)O //HCl) overset((i) C_(2)H_(3)ONa//C_(2)H_(5)OH)to [X] [X] is .
Answer» ANSWER :D

21.	Ester given nucleophilic additionreactionfollowed by eliminationreaction withcarbon nucleophile . Whencarbon nucleophileis of anesterthenthe reactionis knowas Claisencondensationreaction. This reactions is alsocarrieout betweenester and aketone. Asuccessful Claisencondensationrequires an ester withtwo alpha- hydrogensand aan equivalentamountof base ratherthan acatayticamount of base . IntramolecularClaisencondensationgivenby diesteris known as:
Answer» Stoblecondensation Dieckmann CONDENSATION Mannichreaction Reformatsky REACTION ANSWER :A

22.	Ester given nucleophilic additionreactionfollowed by eliminationreaction withcarbon nucleophile . Whencarbon nucleophileis of anesterthenthe reactionis knowas Claisencondensationreaction. This reactions is alsocarrieout betweenester and aketone. Asuccessful Claisencondensationrequires an ester withtwo alpha- hydrogensand aan equivalentamountof base ratherthan acatayticamount of base . Consider the givereactionCH_(3) - COOC_(2)H_(5) underset(C_(2)H_(5)OH)overset(C_(2)H_(3)ONa) to "enolate ion" underset("Claisen condensation")overset("ester(X)")to ProductFor theabovereactionthe mostreactiveesteris :
Answer» `C_(6)H_(5)CO OC_(2)H_(5)` `C_(2)H_(5)O-overset(O)overset(\|\|)(C) -overset(O)overset(\|\|)(C) = OC_(2)H_(5)` `HCO OC_(2)H_(5)` `C_(2)H_(5) O- overset(O)overset(\|\|)(C) - OC_(2)H_(5)` ANSWER :A

23.	Ester formation involves the reaction of
Answer» an ALDEHYDE and a ketone. an ALCOHOL with RMgX. two MOLECULES of an ACID with DEHYDRATING agent An acylhalide with an alcohol Answer :D

24.	Ester are converted in to mixture of alcohol by
Answer» ACID hydrolysis alkaline hydrolysis CATALYTIC hydrogenation oxidation ANSWER :C

25.	Ester and acetamide are distinguished by
Answer» HYDROLYSIS with strong acids or alkali Derivatives of fatty acids Both (a) and (b) NONE of these Answer :C

26.	Establish a relationship between the solubility product and molar solubility for the following BaSO_4 (ii) Ag_2(CrO_4)
Answer» SOLUTION :`BaSO_4(s) LEFTRIGHTARROW^(H_2O) Ba^(2+) (aq)+SO_4^(2-)(aq)` `K_(sp)=[Ba^(2+)][SO_4^(2-)]` `K_(sp)=s^2` (II) `Ag_2CrO_4 leftrightarrow2Ag^+(aq)+CrO_4^(2-)(aq)` `K_(sp)=[AG^+]^2[CrO_4^(2-)]` `=(2s)^2 (s)` `K_(sp)=4s^3`

27.	Essential quantity of ammonium sulphate taken for preparation of 1 molar sollution in 2 litres is
Answer» 132 gm 264 gm 198 gm 212 gm Solution :WEIGHT = molarity `XX` m.w.t. `xx v=1xx132xx2=264 gm`

28.	Essential oils are
Answer» Mixture of various hydrocarbons Pleasant smelling liquids occurring in PLANTS Mix of HIGHER FATTY ACIDS None Answer :B

29.	Essential constituent of an amalgam is
Answer» Iron An ALKALI metal Silver Mercury Answer :D

30.	Essential constituent of an amalgam is :
Answer» FE An alkali metal Silver MERCURY ANSWER :D

31.	Essential amino acid among the following is
Answer» Glycine Tryptophan ALANINE PROLINE Answer :B

32.	E_(Sn^(2+)\|Sn)^@ = -1.14V, E_(Pb^(2+)IPb)^@ = 0.126 The cell reaction of the cell constructed from these two electrodes is
Answer» `PB^(2+) + SN^(2+) to Pb + Sn` `Sn^(2+) + Pb to Sn + Pb^(2+)` `Pb + Sn toPb^(2+) +Sn^(2+)` `Sn + Pb^(2+) to Sn^(2+) +Pb` ANSWER :D

33.	E_("red")^(0) (Standard reduction potential ) of different half-cells are given E_(Cu^(+2)//Cu)^(0) = 0.34 VE_(Zn^(+2)//Zn)^(0)= -0.76 V , E_(Ag^(+) // Ag)^(0) = 0.80 V , E_(Mg^(2+) // Mg)^(0) = -2.37 V . In which cell DeltaG^(@) is most negative ?
Answer» `Zn// Zn ^(2+) (1M)// // MG^(2+) (1M)// Mg ` `Zn//Zn^(2+) (1M)// // Ag^(+) (1M)// Ag ` `Cu// Cu^(2+) (1M)// Ag^(+) (1M)// Ag ` `Ag// Ag^(+) (1M) // Mg^(+2) (1M)// Mg ` Solution :`DeltaG^(0) = -ve implies E_("cell")^(0) = +ve` a ) WRONG` (E_("cell")^(0) -ve)` b)` E_("cell")^(0) = 0.80 + 0.76 = 1.56V` C) `E_("cell")^(0) = 0.80 - 0.34 = 0.46 V ` d) wrong ` (E_("cell")^(0) =-ve )`

34.	Erythrose is an example of……….. .
Answer» SOLUTION :Monosacchrides

35.	Erbium shows was oxidations state
Answer» only `+4` `+3, +4` only `+3` `+2,+3` ANSWER :C

36.	Equivalent weights of CO_(2) in the following reactions 2NaHCO_(3)=Na_(2)CO_(3)+H_(2)O+CO_(2) and NaHCO_(3)+HCl=NaCl+H_(2)O+CO_(2) are respectively,
Answer» 22 & 44 44 & 22 44 & 44 22 & 22 Answer :A

37.	Equivalent weight of the oxidising agent in the unbalanced reaction :- MnO_(4)^(-)+Fe^(+2) to Mn^(+2)+Fe^(+3) is:- (M=molecular weight)
Answer» M/1 M/5 6M/5 M/3 Answer :B

38.	Equivalent weight of MnO_(4)^(-) in acidic, weakly basic and neutral medium are in the ratio of
Answer» `3:5:15` `5:3:1` `5:1:3` `3:5:5 ` SOLUTION :Acdic medium ` MnO_(4)^(- )+8H^(+)+5E^(- )to Mn^(2+) +4H_ 2O` Weaklybasicmedium: `MnO_(4)^(- )+ 2H_2 O+3e^(- )toMnO_2+4 OH^(-) ` Neutralmedium: `MnO_(4)^(- )+2H_2O+3e^(-)toMnO_2+4OH^(-)` ifM isthe MOLECULARWEIGHTOF `KMnO_4 `then its equivalentweight inacidic. acidicbasicand neutralmediarespectivelyare : `M/5 :M/3 :M/3or3 :5:5`

39.	Equivalent weight of N_2 in the change is : N_2 rarr NH_3
Answer» `28//6` 28 `28//2` `28//3` ANSWER :A

40.	Equivalent weight of NH_3 in the change is : N_2 rarrNH_3
Answer» `28//3` 17 `17//2` 17//3 Answer :D

41.	Equivalentweightof KMnO_(4)I acidicmedium is "_____" .
Answer» 3.16 31.6 158 52.67 Answer :B

42.	Equivalent weight of K_(2)Cr_(2)O_(4) in acidic medium is
Answer» `("MOL. wt")/(3)` `("Mol. wt.")/(6)` `("Mol. wt.")/(2)` `"Mol.wt."` Solution :`14H^(+)+Cr_(2)O_(7)^(2-)+6E^(-)rarr2Cr^(3+)+7H_(2)O` `"Eq. wt"=("Mol. wt.")/("No. of electrons GAINED")=("Mol. wt.")/(6)`

43.	Equivalent weight of CO_(2) in the following reactions, 2NaHCO_(3) to Na_(2)CO_(3)+H_(2)O+CO_(2) and NaHCO_(3)+HCl to NaCl + H_(2)O + CO_(2) are respectively
Answer» 22 and 44 44 and 22 44 and 44 22 and 22 SOLUTION :N/A

44.	Equivalent weight of FeC_2O_4 in the change : FeC_2O_4 rarr Fe^(3+) + CO_2 is :
Answer» `17//2` `M//3` `M//2` M//1 Answer :A

45.	Equivalent weight of an acid
Answer» Depends on the reaction involved Depends upon the number of OXYGEN ATOMS PRESENT Is ALWAYS same None of the above Answer :A

46.	Equivalent weight of an acid may be expressed as :
Answer» `"EQ. WT"=("MOL. wt")/("Acidity")` Eq. wt ` xx ` Mol. wt = Basicity Eq. wt ` xx ` Basicity = Mol. wt Eq. wt `= ("Basicity")/("Mol. wt ")` SOLUTION :Eq. wt of an acid `=("Mol. wt")/("Basicity")`

47.	Equivalent mass of oxidising agent in the reaction SO_2+2H_2S to3S+2H_2Ois
Answer» 32 64 16 8 Solution :inthis REACTION`SO_2`oxidises `H_2S ` to `S `THEREFORE`SO_2`actsas theoxidisingDuringoxidation fourelectrons are losti.e., `SO_2+4e^(- )toS+2O^(2-)` thiseq. W tof `SO_2= `mol WT/` 4= 64 /4 =16 . `

48.	Equivalent mass of kMnO_(4) in alkaline medium is
Answer» 158 `52.6` 49 79 Answer :B

49.	Equivalent conductivity of dilute monovalent acidic solution (M)/(32) is 8.0 mol cm^(2) and at infinite dilution equivalent conductivity is 400 mol cm^(2) then the dissociation constant for acid is
Answer» `1.25xx10^(-6)` `6.25xx10^(-4)` `1.25xx10^(-4)` `1.25xx10^(-5)` Solution :Degree of dissociation : `alpha=(Lamda)/(Lamda_(OO))` `=(8.00)/(400)=2XX10^(-2)` `K_(a)=(Calpha^(2))/((1-alpha))~~Calpha^(2)` `=(1)/(32)xx(2xx10^(-2))^(2)` `=1.25xx10^(-5)`.

50.	Molar conductances of BaCl_(2), H_(2)SO_(4) and HCl at infinite dilution are andX_(1),X_(2), and X_(3) respectively. Molar conductance of BaSO_(4) at infinte dilution is
Answer» `(500x)/((x_1 + x_2 - 2x_3))` `(10^(6) X^2)/((x_1 + x_2 - 2x_3)^(3))` `(2.5 xx 10^(5) x^(2))/((x_1 + x_2 - x_3)^(2))` `(0.25x^(2))/( (x _1 + x_2 - x_3)^(2))` Solution :`BaSO_4 = (BaCl_2 + H_2SO_4 -2HCL) , ^^_(BaSO_4) = (2x_1 + 2x_(2) - 2x_(3)) = 2 (x_1 + x_2 - x_(3))` ` S=M =(K xx 1000)/(^^_M) = ( x xx 1000)/(2(x_1 + x_2 - x_3)) , K_(SP)(BaSO_4) = S^(2) = (x^(2) xx (500)^(2))/((x_1 + x_2 - x_3)^(2)) , K_(sp) = (x^(2) xx 2.5 xx 10^(5))/((x_1 + x_2 - x_3)^(2))`