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.

Ethers should never be evaporated to dryness because

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they FORM EXPLOSIVES peroxide
they are insoluble in water
they are INERT
they are LIGHTER than water

Answer :A
2.

Ethersreact withthe formation of ethyl halide with halogen acidsin the orderof reactivity as :

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`HI GT HBR gt HCL `
`HI gt HCl gt HBr `
`HCl gt HBr gt HI `
`HI LT HBr lt HCl`

ANSWER :A
3.

Ethers on hydrolysis yield

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ketone
acid
alcohol
aldehyde

Answer :C
4.

Ethers like alcohols do not form strong.. . Bonding. Hence they are more volatile

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Covalent
HYDROGEN chloride
coordinate
None of the above.

Solution :ETHERS do not FORM hydrogen BOND.
5.

Ethers have angular V-shaped geometry like

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`NH_3`
`H_2O`
`CH_4`
`CH_3^+`

ANSWER :B
6.

Ethers in air forms

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OXIDE
Per-oxide
ALKENES
Alkanes

Answer :B
7.

Ethers in the presence of atmospheric oxygen oxidises to give hydroperoxides and dialkyl peroxides Such a spontenous reaction by atmospheric oxygen is called__________.

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auto OXIDATION
ACYLATION
ALKYLATION
dehydration

ANSWER :A
8.

Ethers form co-ordination complexes with

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`BF_3`
`AlCl_3`
`ZnCl_2`
all of these

Answer :D
9.

Ethers can be used as

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General ANAESTHETIC
REFRIGERANT
In PERFUMERY
All the above.

Solution :NA
10.

Ethers can be prepared byWilliamson synthesis in which an alkyl halide is reacted with sodium alkoxide. Di - tert butyl ether cannot be prepare by this method. Explain.

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Solution :With tertiary BUTYL halide, ELIMINATION is favoured over substitution. So formation of alkene takes place.
`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-Br+Na^(+)O^(-)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-CH_(3)RARR CH_(3)-underset(CH_(3))underset("|")"C "=CH_(2)+NaBr +CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")"C "-OH`
11.

Ethers can be prepared by Williamson synthesis in which an alkyl halide is reacted with sodium alkoxide. Di-tertiary ether can't be prepared by this method. Explain.

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Solution :`to` The Williamson.s reaction take place in presence of strong NUCLEOPHILE ALKOXIDE ion and alkyl halide. The alkoxide ion is ALSO a strong base APART from strong nucleophile. If the substrate is tertiary alkyl halide, the alkoxide ion will bring out the elimination reaction of tertiary alkyl halide that RESULTS in the formation of alkene as a major product.
12.

Ethers can be prepared by Williamson synthesis which an alkyl halide is reacted with sodium alkoxide. Di-tert-butyl ether can't be prepared by this method. Explain.

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Solution :In order to prepare di-tert butyl ETHER, sodium tert-butoxide must be reacted with tert-butyl bromide. Alkoxides are not only NUCLEOPHILES but they are STRONG base as well. They react with `3^(@)` alkyl halides leading to the elimination reaction.
When tert-butyl-bromide reacts with sodium tert-butoxide instead of SUBSTITUTION, elimination takes place. As a result of this elimination reaction, Iso BUTYLENE is formed instead of di-tert butyl ether.
`{:(""CH_(2)-H""CH_(3)""CH_(2)""CH_(3)),("|""|""||""|"),(H_(3)C-C-Br+Na-O-C-CH_(3) overset("Elimination")rarr H_(3)C-C-CH_(3)+H_(3)C-C-OH+NaBr),("|""|" "Iso-butylene" "|"),(""CH_(3)""CH_(3)""CH_(3)),("Tert-butyl bromideSodium.tert butoxide2-methylpropan-2-ol"):}`
`{:(""CH_(2)-H""CH_(3)),("|""|"),(H_(3)C-C-Br+Na-O-C-CH_(3) overset("Substitution")rarr "No reaction"),("|""|"),(""CH_(3)""CH_(3)),("Tert-butyl bromideSodium.tert butoxide"):}`
13.

Ethers can be prepared by Williamson synthesis in which an alkyl halidde is reacted with sodium alkoxide. Di-tert-butyl ether can't be prepared by this method. Explain.

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Solution :Williamson's synthesis occurs by `S_(N)2` mechanism in which SODIUM alkoxide REACTS with an alkyl halide. Now to prepare di-tert-butyl ether, sodium tert-butoxide must be REACTED with tert-butyl bromide. Since `3^(@)` alkyl halides prefer to undergo elimination rather than SUBSTITUTION, therefore, sodium tert-butoxide reacts with tert-butyl bromide and favours elimination to form ISOBUTYLENE rather than substitution to form di-tert-butyl ether.

14.

Ethers can be prepared by (1)heating alkyl halide with R-OH (2)boiling alkyl halide with alc.KOH (3)heating alkyl halide with sodium alkoxide (4)reacting alcohol with diazomethane

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2,3,4
1,2,3
3,4
1,2

Answer :C
15.

Ethers are very good solvent for which type of compound:

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LEWIS base
Acids
Lewis acids
None

Answer :C
16.

Ethers are relatively inert. Justify.

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Solution :Due to ABSENCE of any ACTIVE site in their molecules, divalent oxygen is linked to carbon ATOMS on both SIDES `(C - underset(ddot)overset(ddot)(O)- C)`
17.

Ethers are reacted with cold HI gives

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ONE MOLE ALCOHOL and one mole of ALKYL iodide
Two mole alcohol
Two mole of alkyl iodide
Two mole alcohol and one mole of alkyl iodide

Answer :A
18.

Ethers are quite stable towards :

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Oxidisingagents
Reducing agents
Na metal
All are CORRECT

19.

Ethers are not distilled to dryness for fear of explosion. This is due to formation of

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OXIDES
PEROXIDES
ALCOHOLS
KETONES

Solution :NA
20.

Ethers are not distilled to dryness for fear of explosion. This is due to formation of :

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Oxides
Alcohol
Ketones
Peroxides

Answer :D
21.

Ethers are mainly used as,

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solvent
cooling agent
anaesthetic
substitute of petrol

Answer :A
22.

Ethers are made free from peroxide linkage on distilling impure sample with :

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CONC.`HNO_3`
Conc.`H_2SO_4`
Conc.HCI
None

Answer :D
23.

Ethers are isomeric with

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aldehydes
alcohols
acids
ketones

Answer :B
24.

Ethers are insoluble in water due to the

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ABSENCE of co-ordinate BOND
PRESENCE of co-ordinate bond
absence of H-bond
presence of H-bond

ANSWER :C
25.

Ethers are inactive because they do not contain

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ACTIVE atom
active group
multiple bond
all of these

Answer :D
26.

Ethers are cleaved only by acids and not by bases.

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Solution :The C-O-C BOND in ethers like the C-OH bond in alcohols is quite STRONG. In order to weaken it, the OXYGE atom must be protonated. A subsequent nucleophilic attack by a strong nucleophile such as `BR^(-)` or `I^(-)` ion on the less hindered carbon atom of the protonated `C-underset(H)underset(|)overset(+)(O)-C` bond brings about the cleavage of ethers to form an alcohol and an alkyl halide. for example.

On the other hand, bases cannot weaken the C-O-C bond because ethers themselves being Lewis bases are not ATTACKED by strong bases such as `OH^(-)` or `H^(-)` (from `LiAlH_(4)`) ion. In other words, bases cannot cleave ethers.
27.

Ethers are functional isomers of _________

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ACIDS
alcohols
nitro COMPOUNDS
ALDEHYDES

ANSWER :B
28.

Ethers are basic in nature owing to the presence of

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UNSHARED ELECTRON PAIRS on oxygen
alkyl group
turn BLUE limus red
all of these

Answer :A
29.

Ethers are

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LEWIS acid
acid
Lewis base
base

Answer :C
30.

Ethers are __________.

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alkyl DERIVATIVES or anhydride of alcohols
compound DERIVED from water by replacing boththe HYDROGEN ATOMS of water by alkyl GROUP
alkoxyalkane
all of these

Answer :D
31.

Etherial solution of an organic compound .A. when heated with magnesium gave .B.. .B. on treatment with ethanal followed by acid hydrolysis gave 2- propanol. Identify the compound .A.. What is .B. known as?

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Solution :COMPOUNDS .A. and .B. are identified as under :
`underset(A) underset("Methyl BROMIDE")(CH_(3)Br)+Mg overset("Ether")RARR underet(B)underset("bromide")underset("Methyl magnesium")(CH_(3)MgBr)`
`underset("Ethanal")(CH_(3)-overset(O)overset(||)C-H)+CH_(3)MgBr rarrCH_(3)-overset("OMgBr")overset("|")"CH"-CH_(3)overset(H_(2)O)rarr underset("2-Propanol")(CH_(3)-overset(OH)overset("|")"CH"-CH_(3))`
32.

Ethers and alcohols are

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metamers
functional isomers
tautomers
position isomers

Answer :B
33.

Ethers.

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Solution :(1) DIETHYL ether is used as industrial SOLVENT for oils, FATS gum, RESIN, etc.
(2) It is used as solvent in the reaction of Grignared reagent.
It is used as refrigerant.
(4) Natalite, a mixture of diethyl ether and ETHYL alcohol is used as fuel.
34.

Etherial solution of an organic compound ‘X’ when heated with Mg gave ‘Y’. ‘Y’ on treatment with CH_(3)CHO followed by acid hydrolysis gave 2-propanol. Identify the compound ‘X’. What is ‘Y’ known as ?

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Solution :`UNDERSET(X)(CH_(3)Br) + Mg OVERSET("DRYETHER")(to) underset((y))(CH_(3)MgBr)`
`CH_(3) - overset(O)overset(||)(C ) - H + CH_(3) Mg Br overset("Dryether")(to)``CH_(3) overset(H_(3)O^(+))(to)CH_(3) - overset(OH)overset(|)(CH) - CH_(3)`
35.

Ether which is liquid at room temperature is

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`C_(2)H_(5)OCH_(3)`
`CH_(3)OCH_(3)`
`C_(2)H_(5)OC_(2)H_(5)`
NONE of these

Solution :`CH_(3)OCH_(3) and C_(2)H_(5)OCH_(3)` are gases while `C_(2)H_(5)OC_(2)H_(5)` (b.p. 308 K) is LOW BOILING liquid.
36.

Etheres are isomeric with

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ALDEHYDES
ACIDS
KETONES
ALCOHOLS

ANSWER :D
37.

Ether which is liquid at room temperatureis ____________.

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`C_2H_5OCH_3`
`CH_3OCH_3`
`C_2H_5OC_2H_5`
`CH_3OH`

ANSWER :C
38.

Ether underset(H_2O)overset(dil. H_2SO_4)totwo products . One of the product on oxidation give acetic acid , while the other on oxidation give acetone . The ether is

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ETHYL n-propyl ether
ethyl METHYL ether
ethyl ISOPROPYL ether
methyl isopropyl ether

Answer :C
39.

Diethyl Ether reacts with chlorine in the dark to form-

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`CH_(2)Cl-CH_(2)-O-CH_(2)-CH_(3)`
`CH_(3)Cl-C H_(2)-O-CH_(2)-CH_(2)Cl`
`CH_(3)-CH(Cl)-O-CH(Cl)-CH_(3)`
`CH_(3)-CH(Cl)-O-CH_2-CH_(3)`

ANSWER :C
40.

Ether oxygen is capable of forming ________ bonds with electron deficient species.

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COVALENT
ionic
coordinate covalent
HYDROGEN

ANSWER :C
41.

Ether is formed when ethyl alcohol is heated with conc. H_(2)SO_(4) . The conditions are

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Excess of `H_(2)SO_(4) and 170^(@)`C
Excess of `C_(2)H_(5)OH and 140^(@)C`
Excess of `C_(2)H_(5)OH and 180^(@)C`
Excess of conc. `H_(2)SO_(4) and 100^(@)C`

Answer :B
42.

Ether is prepared by

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WILLIAMSON's synthesis
Wurtz's synthesis
Fridel-Craft's REACTION
HOFFMAN BROMIDE reaction

Answer :A
43.

Ether is formed when alkylhalide is treated with sodium alkoxide. This method is known as

Answer»

HOFFMANN REACTION.
Williamson's synthesis
Wurtz synthesis
KOLBE's reaction

Answer :B
44.

Ether is

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ANSWER :B
45.

Ether in contact with air for a long time form peroxides. The presence of peroxide in ether can be tested by adding Fe^(2+) ion in it and then adding:

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KCNS
`SnCI_2`
`HgCI_2`
KI

Answer :A
46.

Ethers in contact with air for a long time form peroxides. The presence of peroxide in ether can be tested b y adding Fe^(2+) ions followed by the addition of

Answer»

KCNS
`SnCl_(2)`
`HgCl_2`
`KI`

ANSWER :A
47.

Ether form peroxide in contact with air and light it may cause explosion, since the boiling point light it may cause explosion, since the boiling point of peroxide is :

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EQUAL to ETHER
lower than ether
higher than ether
NONE of these

Answer :C
48.

Ether does not react with,

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SODIUM metal
sodium hydroxide
phosphorus trichloride
all of these

Answer :D
49.

Ether fire can be extinguished by :

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Sand
Pyrene
`CO_2`
All

Answer :D
50.

Ether does not form oxonium salt on reaction with-

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COLD CONC. `H_(2)SO_(4)`
Cold conc. HCl
Conc. HI
None of the above.

Solution :`R-underset(..)OVERSET(..)(O)-Roverset(H-I)toR-I+HO-R`