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.

Cooling takes place when real gas expands adiabatically at

Answer»

INVERSION temperature`= (2a)/(RB)`
BOYLE's temperature = `(a)/(Rb)`
CRITICAL temperature`= (8a)/(27Rb)`
None of the above

Answer :A
Discussion
2.

Cooling of a gas in an adiabatic expansion is due to ________ .

Answer»

FALL in temperature
Internal ENERGY SPENT in doing the work
energygained in doing the work
loss of energy to the surroundings

Answer :B
Discussion
3.

Coolent used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at - 0.3 ^(@)C. How much ethylene glycol must be added to 5 kg 18. of water ? (K _(f) =1.86 k kg mol ^(-1))

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50 kg
55 G
45 kg
40 g

Solution :`Delta T_(F) =0.3^(@)C`
`Delta T_(f) =0.3^(@)C =(K_(f)xxW_(B) xx1000)/( M _(B)xx W_(A))`
`= (1.86xxW_(B) xx1000)/( 62xx500)`
`therefore W _(H)=50g`
The ammmt used should be more than 50 g.
Discussion
4.

Convulsions is caused due to deficiency of

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VIT-`B_6`
vit-P
vit-H
vit-D

Answer :A
Discussion
5.

Cooking is fast in a pressure cooker because :

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1. water boils at a higher TEMPERATURE in a pressure cooker.
2. Food is cooked at CONSTANT volume.
3. Loss of heat due to RADIATION is minimum
4. Food PARTICLES are effectively smashed

Answer :A
Discussion
6.

Convulsion is due to deficiency of vitamin

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`B_(1)`
`B_(2)`
`B_(5)`
`B_(6)`

ANSWER :D
Discussion
7.

Converting a freshly precipitated substance into colloidal state by shaking with suitable electrolyte is called………..

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SOLUTION :PEPTIZATION
Discussion
8.

Convert the following into metre (i) 40 Em (thickness of Milky way galaxy) (ii) 1.4 Gm (diameter of Sun) (iii) 41 Pm (distance of nearest star)

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Solution :`{:("(i)1 Em,i.e., EXAMETRE"=18^(18)m,therefore,40Em=40xx10^(18)m=4xx10^(19)m.),("(ii) 1 Gm, i.e., GIGAMETRE "=10^(9)m,therefore,1.4Gm=1.4xx10^(9)m):}`
Discussion
9.

Convert the following into kilograms : (i) 500 Mg (mass of loaded jumbo jet) (ii) 1 fg (mass of human DNA molecule)

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Solution :(i) 1 MG, i.e., megagram `=10^(6)G therefore 500 Mg=500xx10^(6)g=5xx10^(5)kg`
(II) 1 fgi.e. femto gram `=10^(-15)g=10^(-18)kg`
Discussion
10.

Convert the following (ii) Ethanal to but-2-enal.

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Solution :`2CH_(3)CHOoverset(NAOH)underset(dil)toCH_(3)overset(OH)overset(|)CHCH_(2)CHOoverset(H_(3)O^(+)//DELTA)toCH_(2)CH=CHCHO`.
Discussion
11.

Convert the following: (i) Nitro benzene to Benzene (ii) Benzene to Benzic acid

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SOLUTION :
Discussion
12.

Convert the following (i) Ethyl benzene to benzoic acid

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SOLUTION :`C_(6)h_(5)C_(2)H_(5)OVERSET(K_2Cr_(2)O_(7)//H^(+))to C_(6)H_(5)COOH`.
Discussion
13.

Convert the following: a, t- Butyl chloride to isobutyl bromide b. Chloroentane to butane c. 2- Chloropropane to 1- bromopropane d. Bromo benzene to p- nitrophenol e. Isopropyl alchol to iodofrom f. 2- Chloropropane to 1- Propanal g. Butene to n- butyliodite h. Ethyl bromideto propanoic acid. i. 2- Methyl prop -1 ene to 2- Chloro -2- methyl propane j. 2- Bromonbutane to 3,4- dimethyl hexane k. Anline to propanenitrile m. Benzyl alcohol to phenyl ethonaic acid n. Benzene to 4- bromo nitro benzene o. Toulenet benzylalchohol p. I- Bromopropane to 2- bromobnpropane q. Ethanol to but -1- yne r. Propane to propan -1-ol

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SOLUTION :

Discussion
14.

Convert propanone into 2-methy-propan-2-o.

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SOLUTION :
Discussion
15.

Convert phenyl magnesium bromide to phenyl methanol (or) How would you prepare phenyl methanol from Grignard reagent?

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Solution :`underset("Phyenyl magnesium BROMIDE")(C_(6)H_(5)MgBr) + underset("Methane or Formaldehyde")(HCHO) overset("Ether")to C_(6)H_(5) -overset(H)overset(|)underset(H)underset(|)C - OMgBr overset(H_(2)O//H^(+)) to underset("PHENYL Methanol")(C_(6)H_(5) - CH_(2)OH) + Mg(OH)BR`
Discussion
16.

Convert propanoic acid into 2-Bromopropanoic acid.

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Solution :`underset("PROPANOIC ACID")(CH_(3)-CH_(2))-COOH+Br_(2) underset(NaOH)overset("RED P")to underset("2-Bromoproapnoic acid")(CH_(3)-underset(Br)underset(|)(CH)-COOH)`
Discussion
17.

Convert phenyl magnesium bromide into Benzoic acid?

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SOLUTION :
Discussion
18.

Convert phenol into aniline.

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Solution :PHENOL REACTS with ammonia at `300^(@)C` in the PRESENCE of anhydrous `ZnCl_(2)` to GIVE aniline.
Discussion
19.

Convert methyl amine (1^(@) " primary amine ) to "2^(@),3^(@) amine and Quarternary ammonium salt.

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SOLUTION :
Discussion
20.

Convert methanamine into Ethanamine.

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SOLUTION :`underset("Methanamine")(CH_(3)NH_(2))overset(HNO_(2))(to) underset("Methanol")(CH_(3)OH)overset(PCl_(5))(to)underset("METHYL CHLORIDE")(CH_(3)Cl) overset(KCN)(to) underset("ETHANE nitrile")(CH_(3)CN)overset(Na//C_(2)H_(5)OH)(to) underset("Ethanamine")(CH_(3)CH_(2)NH_(2))`
Discussion
21.

Convert m- dinitrobenzene to m-nitro aniline.

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SOLUTION :
Discussion
22.

Convert in not more than four steps. Also mention the temperature and reaction conditions.

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SOLUTION :` (##KSV_CHM_ORG_P2_C15_E01_183_S01.png" WIDTH="80%">.
Discussion
23.

Convert in exactly four steps. Select the regent from the given set and write the four digit number in correct sequence. {:(,(1),"Aqueous KOH",(2),CH_(2)N_(2)//Ag","Delta//H_(2)O),(,(2),CHCl_(3)//KOH,(4),CO_(2)//H^(+)),(,(5),KCN,(6),SOCl_(2)),(,(7),Br_(2)//KOH,(8),Mg//dry " ether"):}

Answer»


ANSWER :8462
Discussion
24.

Convert : (iii) Acetaldehyde to-2-butanol

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SOLUTION :.
Discussion
25.

Convert: (i) Ethanoic acid to propanoic acid. (ii) Ethanol to propanone.

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SOLUTION :The conversion are carried out as under:
(i) `underset("Ethanoic acid")(CH_(3)COOH)overset(LiAlH_(4))(to)underset("Ethanol")(CH_(3)CH_(2)OH)overset(PCl_(5))(to)underset("Chloroethane")(CH_(3)CH_(2)Cl)overset(KCN)(to)underset("Propane nitrile")(CH_(3)CH_(2)C-=N) overset(H_(2)//H^(+))(to)underset("Propaoic acid")(CH_(3)CH_(2)COOH)`
Discussion
26.

Convert : (ii) Malonic acid to acetic acid

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SOLUTION :.
Discussion
27.

Convert : (i) Benzaldehyde to acetophenone

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SOLUTION :.
Discussion
28.

Convert (i) 3-Methylaniline into 3-nitrotoluene (ii) Aniline into 1,3,5-Triboromobenzene.

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SOLUTION :
Discussion
29.

Convert : (i)Acetophenone to ethylbenzene (ii) Ethanal to 2-aminoethanoic acid (iii) Methyl chloride to ethanoic acid.

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Solution :The given conversions can be carried out as under :
(i) `underset("Acetophenone")(C_(6)H_(5)-overset(O)overset(||)C-CH_(3)) overset(NH_(2)-NH_(2))underset(KOH, "Glycol")to underset("Ethylbenzene")(C_(6)H_(5)CH_(2)CH_(3))`
This reaction can also be carried out USING Zn — Hg/HCl
(ii) `underset("Ethanol")(CH_(3)CHO) overset([O])underset(KMnO_(4)//H_(2)SO_(4))to CH_(3)COOH overset("RED" P//Cl_(2))to underset("2-chloroethanoic acid")(underset(Cl)underset(|)(CH_(2)COOH)) overset(NH_(2))to underset("2-Aminoethanoic acid")(underset(NH_(2))underset(|)(CH_(2)COOH)`
(iii) `underset("Methyl CHLORIDE")(CH_(3)Cl+ KCN) to CH_(3)CN + H_(2)O overset(H^(+))to underset("Ethanoic acid")(CH_(3)COOH)`
Discussion
30.

Convert hex-4-ennitrile to hex-4-enal.

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Solution :Diisobutyl aluminium HYDRIDE (DIBAL - H) selectively reduces the alkyl cyanides to form imines which on hydrolysis GIVES aldehydes.
Example :
`underset("hex-4-ennitrile")(CH_(3)-CH=CH-CH_(2)-CH_(2)-CN)underset("II)"H_(2)O)OVERSET("i)"ALH(t-bu)_(2))tounderset("hex-4-enal")(CH_(3)-CH=CH-CH_(2)-CH_(2)-CHO)`
Discussion
31.

Convert : (i) 3-Methylamiline into 3-nitrotoluene "(ii) " Aniline into 1, 3, 5-tribromobenzene.

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SOLUTION :STEPS INVOLVED in the CONVERSIONS are GIVEN below :
Discussion
32.

Convert : Ethyl alcohol into diethyl ether. (ii) Acetone to tertiary butyl alcohol.

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Solution :(i) `underset("Ethyl alcohol")(2C_(2)H_(5)OH)overset("conc. "H_(2)SO_(4))underset("413 K")rarrunderset("Diethyl ether")(C_(2)H_(5)OC_(2)H_(5))+H_(2)O`
(ii) `underset("Acetone")(CH_(3)-overset(O)overset(||)C-CH_(3))+CH_(3)MgBrrarr CH_(3)-overset("OMgBr")overset("|")underset(CH_(3))underset("|")"C "-CH_(3)overset(H_(2)O //H^(+))rarr underset("Tertiary butyl alcohol")(CH_(3)-underset(CH_(3))underset("|")overset(OH)overset("|")"C "-CH_(3))`
Discussion
33.

How will youconvert ethylamine to methylamine ?

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SOLUTION :
Discussion
34.

Convert Ethanamine into Methanamine.

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SOLUTION :
Discussion
35.

Convert: Cyanobenzene to Cinnamaldehyde

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SOLUTION :
Discussion
36.

Convert D-erythrose to next higher aldose.

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SOLUTION :
Discussion
37.

Convertchloroform tochlorobenzenein threestepsusingappropriatereagents

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SOLUTION :
Discussion
38.

Convert C_(6)H_(6) "to" C_(6)H_(5)D.

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SOLUTION :
Discussion
39.

Convert C_(6)H_(5)COOH TO C_(6)H_(5)NH_(2).

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SOLUTION :
Discussion
40.

Convert benzene to aniline using the following reagents in correct order: alkaline KMnO_(4) followed by HC,NH_(3), heat, Br_(2)//KOH,CH_(3)Cl//anhyd. AlCl_(3).

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SOLUTION :
Discussion
41.

Convert benzene to adjacent trimethyl benzene.

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SOLUTION :
`(Me-)` group is `o,p-` directing, so `p-` POSITION has to be BLOCKED by SULPHONATION or by bulky `t-` butyl group.
Discussion
42.

Convert benzene to a-tetralone.

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SOLUTION :
Discussion
43.

Convert benzene diazonium chloride to benzoic acid.

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Solution :`UNDERSET("Renzene DIAZONIUM chloride")(C_(6)H_(5)N_(2)^(+)Cl^(-))+underset("HYDRO FLUORO boric acid")(HBF_(4))tounderset("Benzenediazonium fluoroborate")(C_(6)H_(5)N_(2)^(+)BF_(4)^(-))`
`C_(6)H_(5)N_(2)^(+)BF_(4)^(-)+CH_(3)COOHto underset("Benzoic acid")(C_(6)H_(5)COOH)+BF_(3)+CH_(3)F`
Discussion
44.

Convert Benzene diazonium chloride into phenol.

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Solution :`underset("Benzerne diazonium CHLORIDE")(C_(6)H_(5)N_(2)Cl)+H_(2)O underset(283K)OVERSET(Delta)(to) underset("Phenol")(C_(6)H_(5)OH)+N_(2)+HCL`
Discussion
45.

Convert benzene diazonium chloride into : (i) Benzene (ii) Phenol(iii) Iodobenzene ?

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SOLUTION :
Discussion
46.

Convert: Benzaldehyde to acetophenone

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SOLUTION :
Discussion
47.

Convert aniline to sulphanilic acid.

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SOLUTION :
Discussion
48.

Convert aniline to phenylisocyanide.

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SOLUTION :
Discussion
49.

Convert aniline to p-nitro aniline.

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Solution :To get PARA product, the `-NH_2` group is protected by acetylation with acetic anhydride. Then, the NITRATED product is HYDROLYSED to form the product.
Discussion
50.

Convert aniline into the following compounds (i) N-phenyl benzamide (ii) Phenyl isothiocyanate (iii) 2,4,6- tribromo aniline (iv) Sulphanilinic acid(v) Phenyl isocyanide.

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Solution :(i) `underset("Aniline")(C_(6)H_(5)NH_(2)+C_(6)H_(5)COCL overset("Pyridine")(to)C_(6)H_(5)NH-underset(N-"PHENYL benzamide")underset(O)underset(||)(C)-C_(6)H_(5)+HCl`

(v) `C_(6)H_(5)+underset("Chloroform")(CHCl_(3))+3KOH to underset("PHenyl isocyanide")(C_(6)H_(5)NC+3KCl+2H_(2)O`
Discussion