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.

Ether bottle should not be kept open. Why?

Answer»

Solution :(i) When ether BOTTLE is kept OPEN, they are exposed to atmospheric oxygen and slowlyoxidised to form hydroperoxides and DIALKYL peroxides. These are explosive in nature.Such a spontaneous oxidation by atmospheric oxygen is called autooxidation.

(ii) So to avoid AUTO oxidation and explosion, ether bottle should be kept closed.
Discussion
2.

Ether are miscible with water. Justify this statement.

Answer»

SOLUTION :(i) OXYGEN of ether can also form Hydrogen bond with water and hence they are MISCIBLE with water. (II) Ethers dissolve wide RANGE of polar and non-polar substances.
Discussion
3.

Ether can be dried over sodium, but not alcohol. Why?

Answer»

Solution :Alcohol contains acidic HYDROGEN and so REACTS with sodium metal and releases hydrogen. `2C_2H_5OH + 2Na rarr 2C_2H_5ONa + H_2`
ETHER has no -OH group and does not react with sodium metal. Hence other can be dried over sodium, but not alcohol.
Discussion
4.

Ether and alcohol can be distinguished by the reaction with _______.

Answer»

METALLIC SODIUM
`PCl_5`
`SOCl_2`
Both A and C

ANSWER :D
Discussion
5.

Ethene when treated with Br_2 in the presence of C Cl_4 which compund is formed

Answer»

1,2-dibromoethane
1-bromo-2-chloroethane
Both (a) and (b)
1,1,1-tribromoethane

Solution :`CH_2=CH_2+Br_2 overset(C Cl_4)to underset"1,2-dibromo ETHANE"(undersetunderset(Br)(|)CH_2-undersetunderset(Br)(|)CH_2)`
Discussion
6.

Ethene to chloroethane

Answer»

SOLUTION :ETHENE to chloroethane :
`underset("Ethene")(H_(2)C)=CH_(2)+HClrarrunderset("Chloroethane")(CH_(3)-CH_(2)-CL)`
Discussion
7.

Ethene is subjected to hydroboration oxidation reaction followed by treatment with PCC gives

Answer»

ETHYL alcohol
acetaldehyde
acetic acid
acetone

Answer :B
Discussion
8.

Ethene is mixed with carbon monoxide and hydrogen gas to produce propanal is known as…………..

Answer»

OXO PROCESS
MC Afee proces
Wacker process
Haber process

Answer :A
Discussion
9.

Ethene is formed from ethyl bromide by

Answer»

NUCLEOPHILIC substitution
hydrolysis
hydration
elimination

Answer :D
Discussion
10.

Ethene gives with acidic KMnO_4 solution

Answer»

ETHYLENE glycol
Ethylene oxide
FORMALDEHYDE
Acetaldehyde

Solution :`CH_2=CH_2+2[O]OVERSET(KMnO_4)tounderset"Formaldehyde""HCHO+HCHO"`
Discussion
11.

Ethanolic hydrochloric acid is added in the preparation of glucose from sucrose because

Answer»

HYDROCHLORIC ACID provides acidic medium
glucose is INSOLUBLE in ethanol
fructose is SOLUBLE in ethanol
all of these

Answer :D
Discussion
12.

Ethanole and methanol form a solution that is very nearly ideal. The vapour pressure of ethanol is 44.5mm and that of methanol is 88.7mm at 20^(@)C (a) Calculate the mole fraction of methanol and ethanol in a solution obtained by mixing 60g of ethanol with 40g of methanol. (b) Calculate the partial pressure and the total vapour pressure of this solution and the mole fraction of ethanol in the vapour.

Answer»


ANSWER :(a) `0.49,0.51` (B) `22.7,43.5`, `0.34`
Discussion
13.

Ethanol,C_(2)H_(5)OH, is the substance commonly called alcohol. The density of liquid alcohol is 0.7893 g/ML at 293K. If 1.2 mole of ethonol are needed for a particular experiment, what volume of ethanol shouldbe measured out ?

Answer»

55 Ml
58 ml
70 ml
79 ml

Answer :C
Discussion
14.

Ethanol when warmed with iodine and sodium carbonate gives a yellow coloured crystalline solid, which is used in preparation of antisepticointments. The yellow coloured crystalline substance is :

Answer»

Chloroform
Iodoform
Carbon TETRACHLORIDE
DICHLOROMETHANE

ANSWER :B
Discussion
15.

Ethanol vapours are passed over heated copper at 300^(@)C and product is treated with aqueous NaOH. The final product is

Answer»

`BETA`-hydroxil butyaldehde
Aldol
Both
None

Answer :C
Discussion
16.

Ethanol vapours are passed over heated copper at 300^@C and product is treated with aqueous NaOH.The final product is:

Answer»

ALDOL
`BETA`-HYDROXY butyraldehyde
Both (a) and (B)
None

Answer :C
Discussion
17.

Ethanol vapour is passed over heated copper and the product is treated with aqueous NaOH. The final product is_____.

Answer»

SOLUTION :ALDOL or 3-hydroxybutanal.
Discussion
18.

Ethanol to propane nitrile

Answer»

SOLUTION :`CH_(3)-CH_(2)-OH overset(PCl_(5))rarr CH_(3)-CH_(2)-Cl overset(KCN)rarr CH_(3)-CH_(2)-CN`
Discussion
19.

How are the Ethanol to 3-hydroxybutanal conversions carried in not more than two steps ?

Answer»

Solution :`underset("Ethanol")(CH_(3)-CH_(2)-OH) overset(P.C.C)RARR underset("Ethanal")(CH_(3)CHO) overset(OH^(-))rarr CH_(3) - underset(underset(OH)(|))(CH)-CH_(2)-CHO`
Discussion
20.

Ethanol to 3-hydroxybutanal

Answer»

SOLUTION :
Discussion
21.

Write the relavant chemical equations : Ethanol to 1-butyne

Answer»

Solution :`CH_(3)-CH_(2)-OH UNDERSET(170^(@)C)OVERSET("conc"H_(2)SO_(4))RARR CH_(2)= CH_(2) overset(Br_(2))rarr overset(overset(Br)(|))(CH_(2))-overset(overset(Br)(|))(CH_(2)) underset(KOH)overset("Alc")rarr CH -= CH overset("one mole Na")rarr Na-C -= CH overset(C_(2)H_(5)Br)rarr CH_(3)-CH_(2)-C -=CH`
Discussion
22.

Ethanol reacts with tionyl chloride to gives -

Answer»

Chloro ETHENE `+HCl+SO_(2)`
Chloro ethane `+HOCl+SO_(2)`
Chloro ethane `+HCl+SO_(3)`
Chloro ethane `+HCl+SO_(2)`

Solution :`underset("Ethanol")(C_(2)H_(5)OH)+underset("chloride")underset("Thionyl")(SOCl_(2))to underset("Chloro")(C_(2)H_(5)Cl)+underset("ethane")(HCl)+SO_(2)`
Discussion
23.

Ethanol reacts with thionyl chloride to give ethyl chloride and :

Answer»

`S,SO_2`
`SO_2, HCL`
`Cl_2,SO_3`
`SO_3,HCl`

ANSWER :B
Discussion
24.

"Ethanol" overset(PBr_(3))to X underset(KOH)overset("Alcoholic")to Y underset((ii)H_(2)O)overset((i)H_(2)SO_(4))to Z

Answer»

`CH_(3)CH_(2)OCH_(2)CH_(3)`
``CH_(3)CH_(2)-O-SO_(3)H`
`CH_(3)CH_(2)OH`
`CH_(2)=CH_(2)`

SOLUTION :`CH_(3)CH_(2)OH`
Discussion
25.

Ethanol is used in the preparation of _________.

Answer»

DDT
tincture IODINE
PAIN killermedicines
BENZENE hexachloride

ANSWER :B
Discussion
26.

Ethanol is soluble in water due to :

Answer»

ETHYL group
Hydrogen bonding
Its NEUTRAL nature
Dissociation in water

Answer :B
Discussion
27.

Ethanol is prepared industrially by

Answer»

HYDRATION of ethlene
fermentation of sugar
Both the above
None of these

Solution :Hydration of alkenes
`CH_(2)=CH_(2)+overset(+)(H)HS overset(-)(O)_(4) to CH_(3)-CH_(2)-HSO_(4) `
`CH_(3)-CH_(2)HSO_(4) UNDERSET("boil")overset(H_(2)O) to CH_(3)-CH_(2)-OH+H_(2)SO_(4)`
Fermentation of sugar:
`C_(12)H_(22)O_(11)+H_(2)O overset("inverlase") underset("glucose")(C_(6)H_(12)O_(6))+underset("Fructose")(C_(6)H_(12)O_(6))`
`underset("Glucose or fructose")(C_(6)H_(12)O_(6)) overset("Zymase") to 2C_(2)H_5OH+2CO_(2)`
Discussion
28.

Ethanol is prepard industrialy by

Answer»

Hydration of ehylene
Fermentation of sugars
Both the above
None of above

Solution :Hydration of alkenes
`CH_(2)=CH_(2)+overset(+)H"H"Soverset(-)(O_(4))to CH_(3)-CH_(2)-HSO_(4)`
`CH_(3)-CH_(2)HSO_(4)underset("boil")overset(H_(2)O)to CH_(3)-CH_(2)-OH+H_(2)SO_(4)`
Fermentation of sugars
`C_(12)H_(22)O_(11)+H_(2)O overset("INVERTASE")underset("Glucose")(C_(6)H_(12)O_(6))+ underset("FRUCTOSE")(C_(6)H_(12)O_(6))`
`underset("Glucose or Fructose")(C_(6)H_(12)O_(6))overset("ZYMASE")to C_(2)H_(5)OH + 2CO_(2)`
Discussion
29.

Ethanol is obtained by.......... reaction of acetaldehyde). (oxidation, reduction, polymerisation)

Answer»

SOLUTION :readuction
Discussion
30.

Ethanol is converted into ethyl chloride by reacting with

Answer»

`Cl_(2)`
`SOCl_(2)//Py`
`HCL`
NaCl

Solution :`C_(2)H_(5)OH+SOCl_(2)overset("pyridine")toC_(2)H_(5)CL+SO_(2)+HCl`
Discussion
31.

Ethanol is converted into ethyl chloride byreacting with

Answer»

`POCl_3`
`SOCl_2`
`KCL`
NaCl

Answer :B
Discussion
32.

Ethanol is converted into ethyl chloride by reacting with _________.

Answer»

`Cl_(2)`
`SOCl_(2)`
HCl
NaCl

Answer :B
Discussion
33.

Ethanol is converted into Ethoxy ethane ………………………. .

Answer»

by heating with CONC. `H_2SO_4" at " 443 K`s
by heating with conc. `H_2SO_4` at 413 K
by heating with excess OXYGEN
by heating with HYDROGEN

Solution :by heating with conc. `H_2SO_4` at 413 K
Discussion
34.

Ethanol is converted into ethoxyethane

Answer»

by HEATING excess of ethanol with conc. `H_(2)SO_(4)` at `140^(@)C`
by heating ethanol with excess of conc. `H_(2)SO_(4)` at 443K
by TREATING with conc.`H_(2)SO_(4)` at room TEMPERATURE
by treating with conc.`H_(2)SO_(4)` at 273 K

Solution :`underset("Ethanol"("excess"))(2CH_(3)CH_(2)OH)underset(140^(@)C)overset("Cone."H_(2)SO_(4))toCH_(3)underset("Ethoxyethane")(CH_(2)-O-)CH_(2)CH_(3)+H_(2)O`
Discussion
35.

Ethanol has higher boiling point than methoxy methane. Give reason.

Answer»

SOLUTION :Because of H-bonds.
Discussion
36.

Ethanol containing some methanol is called as

Answer»

METHYLATED SPIRIT
rectified spirit
absolute spirit
PROOF spirit

Answer :A
Discussion
37.

Ethanol cannot be obtained by

Answer»

fermentation of sugers in MOLASSES
fermentation of starach in rice
hydration of ethene
destructive DISTILLATION of WOOD.

SOLUTION :Destructive distillation of wood gives wood alcohol or METHANOL.
Discussion
38.

Ethanol, commonl,y called as alcohol, is an excellent solvent. It is used in medicines and is also an important starting material in the synthesis of many chemical compounds. However, in spite of its benefits to man, its impact on social behaviour has always been questioned. media has often shown abnormal behaviour of people while drunk. it is cosidered as a curve in the lives of those who are addicted to alcohol -'alcoholic' people are not only lowering their metabolism and affecting Central Nervous system, they are also a threat to the lives of others. anger ad rude behaviour are some of its ill effects. Now answer the following questions: (i) Comment on the statement- 'Should production of alcohol be banned'? Give three value reason to justify. (ii) As a student what initiative would you take in the common concern to 'Save Life', do not drink, give two suggestions.

Answer»

Solution :(i) Alcohol is an important industiral solvent for paints, LACQUERS, varnishes, dyes, perfumes, tintures, cough syrups and MANY other medicines. It is also used an an antiseptic ad disinfectant and can also be used in the manufacture of important chemicals such as ether, chloroform, iodoform, acetic acid, etc. Iit is also being mixed with petrol and is used as a high octane fuel for automobiles. THEREFORE, its production cannot be BANNED. the best way is to regulate its production and supply.
(ii) Consumption of alcohol is a wide spread social evil. it has ruined many families and is the root cause of many unwanted deaths. therefore, a sense of awareness should be created in the MINDS of people who are addicted to drunking of alcohol. to do so alcoholics may be shown skits, plays and dramas highlighting bad effects of drinking alcohol. they can also be discouraged from drinking alcohol by writing articles in magazines and newspaper and by sloga writing at public places.
Discussion
39.

Ethanol cannot be dried over anhydrous CaCl_(2) because

Answer»

`CaCl_(2)` DISSOLVES in it
it forms a solid alcoholate i.e. `CaCl_(2) 3C_(2)H_(2)OH`
it is not a good dehydrating agent
it reacts with `CaCl_(2)` to FORM `H_(2)` gas.

Solution :Ethanol forms a solid alcoholate, ie `CaCl_(2).3C_(2)H_(5)OH`
Discussion
40.

Ethanol and methoxy methane are:

Answer»

CHAIN isomers
Functional isomers
Positional isomers
Optical isomers

Answer :B
Discussion
41.

Ethanol and methoxy methane are _________.

Answer»

chain ISOMERS
position isomers
functional isomes
METAMERS

ANSWER :C
Discussion
42.

Ethanol and ethanal are separated from their mixture using the reagent

Answer»

HCN
`NaHSO_4`
`C_6 H_5 NHNH_2`
All

ANSWER :B
Discussion
43.

Ethanol and ethanal are distinguished by

Answer»

Fehling's SOLUTION
Tollens reagent
Iodoform TEST
Cericammonium NITRATE

Solution :ETHANOL `(Ch_3 CH_2OH)` and Ethanal` (CH_3 -CHO)` can be distinguished by `overset("Fehling.s solution")underset("Tollen.s solution")( )}"Aldehydes test"` , Cerric ammonium nitrate is Alcohols test
Discussion
44.

Ethanoic acid to propanoic acid

Answer»

Solution :`CH_(3) - COOH overset(CA(OH)_(2)) (to) (CH_(3) COO)_(2) Ca UNDERSET(Delta)(to) CH_(3) COCH_(3) overset(LiAlH_(4))(to) CH_(3) - CH_(2) - OH overset(PBr_(3))(to) CH_(3) CH_(2) Br overset(KCN)(to) CH_(3) CH_(2) CN overset(H_(3) O^(+))(to) CH_(3) CH_(2) COOH`
Discussion
45.

Ethanoic acid overset(P//Br_2)(to)2-bromoethanoic acid . This reaction is called

Answer»

FINKELSTEIN REACTION
HALOFORM reaction
hell-volhard-zelinsky reaction
NONE of these

SOLUTION :finkelstein reaction
Discussion
46.

Ethanoic acid to aminomethane

Answer»

Solution :`underset("(Acetic acid)")(CH_(3)COOH) overset(SoCl_(2))RARR underset("(Acetyl CHLORIDE)")(CH_(3)COCL)overset(NH_(3))rarr`
`underset("(ACETAMIDE)")(CH_(3)CONH_(2))overset(Br_(2)/KOH)Rarr underset("(Methana mine)")(CH_(3)NH_(2))`
Discussion
47.

Ethanoic acid is a weaker acid than methanoic acid due to_____of the methyl group.

Answer»

SOLUTION :`+I`-EFFECT.
Discussion
48.

Ethanoic acid or CH_3COOH is a weak acid because :

Answer»

it is highly ionised
it has no REPLACEABLE hydrogen
is is SLIGHTLY ionised
it is INSOLUBLE in water

Answer :C
Discussion
49.

Ethane nitrile is botain by the reaction of following

Answer»

`CH_(3)Br+KCN`
`C_(2)H_(5)Br+KCN`
`CH_(3)Br+AgCN`
`C_(2)H_(5)Br+AgCN`

Solution :`CH_(3)Br+KCN OT CH_(3) CN+KBr`
Discussion
50.

Ethane to bromoethene

Answer»

Solution :`CH_(3)-CH_(3) underset(DELTA "Pyrolysis")OVERSET(450^(@)C)RARR CH_(2)=CH_(2) underset(C Cl_(4))overset(Br_(2))rarr overset(overset(BR)(|))(CH)_(2)- overset(overset(Br)(|))(CH_(2)) underset(KOH)overset(Alc)rarr CH_(2)= overset(overset(Br)(|))(CH) underset(KOH)overset("Alc")rarr CH -= CH`
Discussion