Explore topic-wise InterviewSolutions in Current Affairs.

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.

Name the reagent in the following conversion? CH_(3)-CO-CH_(3) overset(?)to CH_(3)-underset(OH)underset(|)(C)H-CH_(3)

Answer»

SOLUTION :Lithium aluminium HYDRIDE `(LiAlH_(4))` or SODIUM BOROHYDRIDE `(NaBH_(4))`.
Discussion
2.

Name the reagent for the conversion of an amide to amine containing the same number of carbon atoms.

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ANSWER :`LiAlH_(4)`
Discussion
3.

Name the reagent for the conversion of acid chlorides to the corresponding aldehydes.

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SOLUTION :`H_2` in PRESENCE of PD over `BaSO_4`
Discussion
4.

Name the reaction when hydrolysis of ester in an alkaline medium takes place.

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SOLUTION :First ORDER reaction with MOLECULARITY TWO.
Discussion
5.

Name the reaction used to prepare alcohol by the reaction between alkene and diborane.

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SOLUTION :Hydroboration-oxidation
Discussion
6.

Name the reaction of prop- halogenation of prop- carboxylic acid.

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Solution :The REACTION of `prop`- halogenation of `prop`- CARBOXYLIC acid is termed as HVZ reaction.
Discussion
7.

Name the reaction that takes place when a mixture of potassium dichromate and potassium chloride (or sodium chloride) crystals is warmed with conc. sulphuric acid. Give the equation for the reaction.

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SOLUTION :CHROMYL CHLORIDE EQUATION:
`K_2Cr_2 O_7 + 4KCl + 6H_2SO_4 to 6KHSO_4 + 2CrO_2Cl+2 + 3H_2O`.
Discussion
8.

Name the reaction in which platinised asbestos is used as catalyst.

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SOLUTION :Manufacture of SULPHURIC acid by CONTACT PROCESS.
Discussion
9.

Name the reaction for the preparation of ethers using alkyl halide and sodium ethoxide.

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SOLUTION :WILLIAMSON SYNTHESIS
Discussion
10.

Name the reaction C_10H_22overset"900 K"to C_4H_8+C_6H_14

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Alkylation
Cracking
Pyrolysis
Fractionation

Solution :`UNDERSET"DECANE"(C_10H_22)underset"cracking"overset"900 K"to underset"BUTENE"(C_4H_8)+ underset"Hexane"(C_6H_14)`
Discussion
11.

Name the reaction and the reagent used for the conversion of acid chloride to the corresponding aldehydes.

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Solution :Name: Resenmund reaction. Reagent: `H_(2)` in presence of Pd (supported over `BaSO_4`) and partially POISONED by addition of sulphur or quinoline.
`underset("Acid chloride")(R-overset(O)overset(||)(C)-Cl)+H_(2) underset("+S or quinoline")overset(Pd//BaSO_(4))to underset("Aldehyde")(R-overset(O)overset(||)(C)-H)+HCL`
WRITE the structures of A and B in the following:
Discussion
12.

Name the purest form of commercial iron.

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Solution :The purest FORM of commercial iron is WROUGHT (or) MALLEABLE iron.
Discussion
13.

Name the purines present in DNA.

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SOLUTION :ADENINE and GUANINE.
Discussion
14.

Name the protein present in hair.

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SOLUTION :Kertain PROTEIN is PRESENTIN HAIR.
Discussion
15.

Name the proteins which are folded to form special structure and have intramolecular hydrogen bonding.

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SOLUTION :The proteins which are folded to form special structure and have INTRAMOLECULAR HYDROGEN bonding are CALLED GLOBULAR proteins.
Discussion
16.

Name the products when anisole is heated with HI.

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Solution :In ANISOLE `(C_(6)H_(5)-O-CH_(3)),C_(6)H_(5)-O` bond has some double bond character due to resonance and hence more difficult to break. As a result, nucleophilic attack by `I^-` ION occurs on `CH_(3)` group FORMING methyl iodide and phenol.
`UNDERSET("Anisole")(C_(6)H_(5)O-CH_(3))+HI overset(373K)to underset("Phenol")(C_(6)H_(5)OH)+underset("Methyl iodide")(CH_(3)I)`.
Discussion
17.

Name the promoter used in the Haber's process for the manufacture of ammonia.

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Solution :MOLYBDENUM ACTS as a promoter for IRON in the Haber.s process for MANUFACTURE of ammonia.
Discussion
18.

Namethe products of hydrolysisof sucrose . Why is sucrose not a reducingsugar ?

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Solution :`C_(12) underset("Sucrose")(H_(22)O_(11)) + H_(2)O overset(H^(+))to underset("Glucose")(C_(6)H_(12)O_(6)) + underset("Fructose ")(C_(6)H_(12)O_(6))`
Thetwomonosaccharides,glucose and fructoseare held togetherby a glycosidic linkage BETWEENC -1 of `alpha` - glucoseand C-2 of ` beta`- fructose .
As the reducing GROUPS of glucoseand fructoseare INVOLVED in glycosidic areinvolved in glycosidic bond,SUCROSEIS a non - reducingsugar .
Discussion
19.

Name the products obtained when benzaldehyde is made to undergo Cannizzaro's reaction using a concentrated solution of potassium hydroxide. Give the equation of the reaction.

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SOLUTION :
Discussion
20.

Name the products obtained in the following reaction

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SOLUTION :
Discussion
21.

Name the products obtained in the following reaction

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SOLUTION :
Discussion
22.

Name the products formed when ethanoic acid is heated with ethanol in the presence of conc. H_(2)SO_(4)?

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SOLUTION :ETHYL ethanoate or ETHYLACETATE.
Discussion
23.

Name the product when ethene is treated with Br_(2) " in " C Cl_(4) .

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SOLUTION :1, 2- DIBROMOETHANE
Discussion
24.

Name the product obtained when toluene is chlorinated in the presence of light and the intermediate product is hydrolysed with water.

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SOLUTION :BENZALDEHYDE
Discussion
25.

Name the product of hydrolysis of sucrose. Why is sucrose not a reducing sugar ?

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Solution :On hydrolysis , sucrose gives equimolar MIXTURE of D-(+)-glucose and D-(-)-FRUCTOSE. Sucrose is not a REDUCING SUGAR as glucose and fructose are LINKED through their reducing centres in structure of sucrose.
Discussion
26.

Name the product obtained when sucrose is hydrolysed accompanied by change in sign of rotation.

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SOLUTION : INVERT SUGAR
Discussion
27.

Name the product of the aqueous solution of formal - dehyde.

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SOLUTION :The PRODUCT of the AQUEOUS solution of FORMAL dehyde is FORMALIN.
Discussion
28.

Name the product obtained when acetaldehyde reacts with hydroxyl amine.

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SOLUTION :ACETALDOXIME
Discussion
29.

Name the product obtained by the followingreaction ? CH_(3)-CH_(2)-CH_(2)-CH=CH_(2) underset(H_(2)O_(2)//OH^(+))overset((BH_(3))_(2))to ?

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Pentan-3-ol
Pentan-2-ol
Pentan-1-ol
2-methyl butan-2-ol

Solution :Pentan-1-ol
Discussion
30.

Name the product obtained initially when phenol and formaldehyde are condensed.

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SOLUTION :NOVOLAC
Discussion
31.

Name the product obtained by reductive ozonolysis of ethene.

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SOLUTION :FORMALDEHYDE
Discussion
32.

Write down the products of the following reactions : Toluene is treated with alkaline KMnO_4 .

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ANSWER :BENZOIC ACIDS
Discussion
33.

Name the product formed when tertiary butyl alcohol is treated with Cu at 573 K?

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2-methyl PROP-1-ene
2-methyl prop - 2- ene
propene
1-butene

SOLUTION :2-methyl prop-1-ene
Discussion
34.

Name the product formed when phenol is treated wilh acidified solution of Na_2Cr_2O_7 Give equation.

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Solution :PHENOL undergoes OXIDATION with CHROMIC acid and produces a conjugated diketone KNOWN as benzoquinone.
Discussion
35.

Name the product formed when phenol is heated with ammonia in the presence of anhydrous ZnCl_2 .

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BENZENE
ANILINE
ANISOLE
Phenyl acetate

Solution :Anisole
Discussion
36.

Name the product formed when ethan-1, 2-diol is treated with anhydrous ZnCl_2.

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ETHANOL
ETHENE
ETHANE
ETHANAL

Solution :Ethanal
Discussion
37.

Name the product formed when chlorobenzene is heated with aqueous ammonia in presence of cuprous oxide.

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SOLUTION :
Discussion
38.

Name the product formed ,when benzoic acid reacts with ammonia to form.

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ANSWER :ANILINE
Discussion
39.

Name the product formed when aniline reacts with carbonyl chloride in the presence of pyridine.

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Phenylcyanate
PHENYLISOCYANATE
Phenylcyanide
Phenylisocyanide

SOLUTION :
Discussion
40.

Name the product formed when Benzaldehyde reacts with N,N- dimethyl aniline in the presence of conc.H_2SO_4?

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Cinnamic acid
Schiff's base
Malachite green DYE
p - HYDROXY azodye

Solution :Malachite green dye
Discussion
41.

Name the product formed when acetone is warmed with sodium hypoiodite solution

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SOLUTION :IODOFORM and SODIUM ACETATE
Discussion
42.

Nametheprocessesfromwhichchlorineisobtained asabye-product. Whatwill happenif an aqueoussolution ofNaCl issubjectedto electrolysis ?

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SOLUTION :SodiummetalispreparedbyDown'sprocess.Itinvolves theelectrolysisofafusedmixtureofNaCland` CaCl_ 2`at 873 K.Duringelectrolysis, sodiumisdischarged at thecathodewhile` Cl _ 2 `isobtained at theanodeasabye-product.
` "" NaCl(l)overset ("Electrolysis")to Na^(+) ("MELT ") + Cl^( - )("melt" )`
Atcathode :`Na^(+) ("melt" )+e ^(- )TONA (s) `
At anode:` "" Cl^( -)("melt") toCl(g) +e ^( - ) , 2Cl (g) toCl_ 2 (g)`
If, however, an AQUEOUS solutionofNaCl iselectrolysed, `H_2 `isevolved atthe cathodewhile` Cl_ 2 `isobtainedattheanode.Thereasonbeingthatthe`E^(@) `of`Na^(+)//Na` redox coupleis much LOWER ` (E^(@) =- 2*71V) `thanthatof` H_2O(E^(@)""_(H_2 O // H_2) =- 0*83 V) `andhencewaterisreducedto` H_ 2 `in preferenceto`Na^(+) `ions.
NaOH is, however,obtainedin thesolution.
`"" NaCl (aq) overset ("Electrolysis") toNa^(+) (aq) +Cl^(- ) (aq)`
At anode :`Cl^( - ) (aq) toCl (g) +e ^(-),2 Cl (g) toCl_ 2 (g)`
At cathode :`2 H_2O(l) +2 e^( - ) toH_ 2 (g) +2 OH^(- ) (aq) `
Discussion
43.

Name the processes from which chlorine is obtained as a by-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis?

Answer»

Solution :Sodium METAL is prepared by Down.s process. It involves the electrolysis of a fused mixture of NaCl and `CaCl_(2)` at 873 K. During electrolysis sodium is discharged at the cathode while `Cl_(2)` is obatained at the anode as a by-product.
`NaCl(l) overset(" Electrolysis ")(to) Na^(+) (" melt ")+Cl^(-) (" melt ")`
At cathode : `Na^(+) (" melt ")+e^(-) to Na(s)`
At anode : `Cl^(-) (" melt ")to Cl(G) +e^(-)`
`2Cl(g) to Cl_(2)(g)`.
If, however, an aqueous solution of NaCl is electrolysed, `H_(2)` is evolved at the cathode while `Cl_(2)` is obtained at the anode. The reason being that the `E^(0)" of "Na^(+)"/"Na` redox couple is much lower `(E^(0)= -2.71 V)` than that of `H_(2)O (E_(H_(2)O"/"H_(2))^(0)= -0.83V)` and HENCE water is reduced of `H_(2)` in preference to `Na^(+)` IONS. Lower the reduction potential `(E^(0))`, greater is the EASE of deposition at cathode. NaOH is obtained in the solution.
`NaCl(aq) overset(" Electrolysis ")(to) Na^(+) (aq)+ Cl^(-)(aq)`
At anode : `Cl^(-)(aq) to Cl (g) +e^(-)`
`Cl(g) to Cl_(2)(g)`
At cathode : `2H_(2)O(l)+2e^(-) to H_(2)(g)+2OH^(-)(aq)`.
Discussion
44.

Name the processes from which chlorine is obtained as a by-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis ?

Answer»

Solution :Down.s PROCESS is used for PREPARATION of sodium metal where dichlorine is OBTAINED as a by-product. In this process, molten NaCl containing `CaCl_2` (flux) is electrolysed. `CaCl_2` lowers the melting point of NaCl.
`NaCl_((l))overset(873 K)(rarr) Na_((l))^(+) + Cl_((l))^(+)`
Cathode : `2Na_((l))^(+) + 2E^(-) to 2Na_((l))`
Anode : `2Cl_((l))^(-) to Cl_(2(g)) + 2e^(-)`
(ii) When aqueous NaCl is electrolysed `H_2` is evolved at cathode an `Cl_2` at anode. The `H_2` is evolved because `E_(H_2O//H_2)^(Theta)`is less negative than `E_(Na^(+)//Na)^(Theta)`Thus, preferentially, water will be reduced to H, at cathode.
Anode : `2Cl_((aq))^(-) to Cl_(2(g)) + 2e^(-)`
Cathode : `2H_2 O_((l)) + 2e^(-) to H_(2(g)) + 2OH_((aq))^(-)`.
Discussion
45.

Name the product formed Acetaldehyde reacts with Zinc amalgam and conc.HCI?

Answer»

PROPANE
ETHANE
Ethene
Ethanal

SOLUTION :Ethane
Discussion
46.

Name the process which is used to improve upon the physical properties of rubber.

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SOLUTION :VULCANISATION
Discussion
47.

Name the process usually employed for the purifacation of -Nickel.

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SOLUTION :Mond.s PROCESS
Discussion
48.

Name the process used for the benefaction of ores if the ore is soluble in some suitable solvent.

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SOLUTION :LEACHING.
Discussion
49.

Name the process to prepare polythene from ethene.

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ADDITION
CONDENSATION
Displacement
Oxidation

SOLUTION :Addition
Discussion
50.

Name the process that is employed to refine aluminium?

Answer»

Hall's process
Mond process
Hoope's process
Serperck's process

SOLUTION :Al is refined by HOPPE's ELECTROLYSIS process.
Discussion