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.

Diethyl ether is extensively used for solvent extraction because of :

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High solubility of ORGANIC compounds in ETHER
High VOLATILITY of ether which can be separated from the compounds by distillation
Both (a) and (B)
None

Answer :C
2.

Ether is :

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Very active
Replaceable
Active
Comparatively inert

Answer :D
3.

Oxygen atom of ether is:

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Very active
Replaceable
Active
Comparatively inert

Answer :D
4.

Diethyl ether is conveniently prepared in laboratory from

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diazomethane
CONTINUOUS etherification process
Williamson's SYNTHESIS
all of these

Solution :USING dizomethane only METHYL ethers are prepared , while using Williamson's synthesis simple and mixed ethers are prepared . However by using continuous etherification process only simple ETHER can be prepared.
5.

Diethyl ether is decomposed on heating with:

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NaOH
Water
`KMnO_4`
HI

Answer :D
6.

Diethyl ether into n-butane

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Solution :DIETHYL ETHER into n-butane:
`C_(2)H_(5)-O-C_(2)H_(5)+underset("conc.(excess)")(2HI)overset(Delta)rarrunderset("ETHYL iodide")(2C_(2)H_(5)I)+H_(2)O`
`underset("ethyl iodide")(C_(2)H_(5)I)+2Na+C_(2)H_(5)Iunderset(("Wurtz reaction"))overset("dry ether")rarrCH_(3)-underset("n-butane")(CH_(2))-CH_(2)-CH_(3)+2NaI`
7.

Diethyl ether finds use in medicine as

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A PAIN killer
A hypnotic
An antisptic
AN ANAESTHETIC

Solution :An anaesthetic
8.

Diethyl ether finds use in medicinc as ……………… .

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a PAIN KILLER
a hypnotic
an ANTISEPTIC
an ANAESTHETIC

SOLUTION :an anaesthetic
9.

Diethyl ether finds its use in medicine as

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anaesthetic
antiseptic
hypnotic
pain killer

Answer :A
10.

Diethyl ether finds its use in medicine as:

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PAIN killer
Hypnotic
Antiseptic
Anaesthetic

Answer :D
11.

Diethyl ether exhibits metamerism with

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`CH_3OCH_2CH_2CH_3`
`CH_3OCH(CH_3)_2`
both 'a' and 'B'
`CH_3COC_2H_5`

ANSWER :C
12.

Diethyl ether does not react with

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DIL.`H_2SO_4`
HI
`CH_3COOH`
`PCl_5`

ANSWER :C
13.

Diethyl ether can be regarded as unhydride of

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`CH_3-OH`
`C_2H_5-OH`
`C_2H_5-COOH`
`CH_3COOH`

ANSWER :B
14.

Diethyl ether does not react with :

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SULPHURIC ACID
HYDROCHLORIC acid
hydroiodic acid
acetic acid

Answer :D
15.

Diethyl ether can be distinguished from butan-1-ol by

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AQ. `FeCl_3`
NA metal
Tollens reagent
Fehling reagent

Answer :B
16.

Diethyl ether can be distinguished from n-butanol by

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aqueous `FeCl_(3)`
reaction with Na metal
Tollens' reagent
reaction with chromic anhydride (`CrO_(3)`) in dil. `H_(2)SO_(4)`

Solution :`CH_(3)CH_(2)CH_(2)CH_(2)OH+Na to CH_(3)CH_(2)CH_(2)CH_(2)O^(-)Na^(+)+1//2H_(2)`
`CH_(3)CH_(2)-O-CH_(2)CH_(3)+Na to "no ACTION"`
`CH_(3)CH_(2)CH_(2)CH_(2)OH OVERSET(CrO_(3)+"dil." H_(2)SO_(4))to CH_(3)CH_(2)CH_(2)CHO overset("[O]")to CH_(3)CH_(2)CH_(2)COOH`
17.

Diethyl ether by regareded as anhydride of :

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`C_2H_5COOH`
`C_2H_5OH`
`C_2H_5CHO`
`C_2H_5COOC_2H_5`

SOLUTION :NA
18.

Diethyl ether can be decomposed by

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HI
NaOH
Water
`KMnO_(4)`

SOLUTION :NA
19.

Diethyl ether can be decomposed by heating with

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NAOH
`KMnO_4`solution
Water
HI

Answer :D
20.

Diethyl ether can be decomposed with

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DILUTE AQUEOUS `KMnO_4`
Water
Dilute equeous `NAOH`
`HL` solution

Answer :D
21.

Diethyl ether and methyl n propyl ether are

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POSITION isomers
Functional isomers
Metamers
Chain isomers

Solution :`C_(2)H_(5)-O-C_(2)H_(5)` and `CH_(3)-O-C_(3)H_(7)` are metamers.
22.

Diethyl ether absorbs oxygen to form

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Red coloured sweet SMELLING compound
Acetic acid
ETHER suboxide
Ether peroxide

Solution :`C_(2)H_(5)OC_(2)H_(5)+O_(2) to CH_(3) -UNDERSET("Ether peroxide")(CH_(3)-underset(O-OH)underset(|)CH-O-C_(2)H_(5)`
23.

Diethyl ether absorbs oxygen to from :

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RED COLOURED SWEET SMELLING compound
Acetic acid
Ether suboxide
Ether peroxide

Answer :D
24.

Diethyl amine when treated with nitrosacidyields

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diethyl alcohol
N NITROSO diethyl amine
N nitroso diethyl amne
TRIETHYL ammonium NITRITE

Solution :When diethyl amine treated with nitrous acid it yields N nitroso diethyl amine
`H_5C_2-undersetundersetH|N-C_2H_5+HONO overset(-H_2O)to underset"N-nitroso diethl amine ( yellow OILY liquid )"(H_5-oversetoverset(C_2H_5)(|)N-N=O)`
25.

Diethyl -beta, beta-dimethylglutaric acid (ester) is condensed with diethyl oxalate in presence of sodium ethoxide and ethanol to from a major product (P), which on acidic hydrolysis followed by heating gives another product (Q). Calculate total number of C=O bonds in (P) and (Q) compounds?

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SOLUTION :`[6]`
26.

Diethyl carbonate on heating with ammonia gives :

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`C_2H_5NH_2`
`(C_2H_5)_3N`
`(C_2H_5)_2NH`
Urea

Answer :D
27.

Diethyl amine when trated with nitrous acid yeilds

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Diethyl ammonium nitrite
Ethyl alcohol
N-nitroso diethyl AMINE
Triethyl ammonium nitrite

Solution :`(C_(2)H_(5))_(2)NH + HONO overset(NaNO_(2) + HCL) underset("COLD") to underset("N-nitrosodiethyl amine")((C_(2)H_(5))_(2)N-N= O + H_(2)O)`
28.

Diethyl amine on oxidation with KMnO_4 gives :

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Ethanal
Propanone
Tetraethyl HYDRAZINE
None

Answer :C
29.

Diethyl amine ismore basicthan

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`Ethylamine
Triethyl amine
Ammonia
All of these

Solution :Orderof basicityof aminein SECONDARY`GT`primary`gt`TERITARY
30.

Diethly ether is safe to heat if it does not gives:

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blood RED colour with `FeSo(4)`+KCNS
blue colour with KL STARCH
both (a) and (b)
non of these

Solution :N//A
31.

Diels-Alder reaction will not take place with which ofthe following reactants?

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Solution :Diel-Alder REACTION is the reaction between conjugated dienes (compounds containing alternate double bonds) and ALKENES to form cycloalkenes. Diels-Alder reaction will not TAKE place with and || since, it is not a conjugated ALKENE.
32.

"Dielectric substances are related to conductors. "Dielectric substances do not conduct electricity at normal condition" These are two arguments of a class discussion. Do you agree with these arguments?

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ANSWER :YES
33.

Dicyclic nitrogen bases are I) Adenine II) Cytosine Ill) Guanine IV) Thymine

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I and III
I and II
II and III
III and IV

Answer :A
34.

Dicromate ion in acidic medium oxidizes stannous ion as XSn^(2+)+yCr_(2)O_(7)^(-2)+zH^(+)impliesaSn^(+4_)+bCr^(+3)+cH_(2)O a. The value of x:y is 1:3

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a,C,d
B,c,d
a,b,d
a,c

Solution :NA
35.

Dichromate ion in acidic medium oxidizes stannous ion as. xSn^(2+) + yCr_2O_7^(-2) + zH^(+) rArr aSn^(+4) + bCr^(+3) + cH_2O (a) The value of x : y is 1 : 3 (b) The value of x + y + z may 18 (c) a : b is 3 : 2 (d) The value of z-c is 7 The correct code is -

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a,C,d
B,c,d
a,b,d
a,c

Answer :B
36.

Dichloromethane is also known as chloroform.

Answer»


ANSWER :F
37.

Dichloromethane (CH_(2)Cl_(2)).

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Solution :(1) Dichloromethane dissolves wide range of organic compounds, hence it is used as a solvent for many chemical reactions.
(2) It is used as a solvent as a paint remover and DEGREASER.
(3) It is used as prpellant in aerosols and as a FUMIGANT pesticide for grains and strawberries.
(4) It is used to decaffinate tea of coffee.
38.

Dichloromethane is also known as methylene chloride.

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ANSWER :T
39.

Dichloroethylene does not show :

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GEOMETRICAL ISOMERISM
OPTICAL isomerism
Both
None

Answer :B
40.

Dichloro ethylene shows:

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GEOMETRICAL isomerism
Position isomerism
BOTH (A) AND (B)
NONE of these

Answer :C
41.

Dicarboxylic acids have two carboxylic groups, e.g., Acidity of dicarboxylic acid depends upon the stability of intermediate ion and upon the distance between two carboxylic groups. Shorter the distance between two carboxylic groups, greater is the acidic character. Melting point of these acids depends on the symmetry. Greater the symmetry, higher will be the melting point. Dicarboxylic acids on heating give monocarboxylic acid allkanes, cyclic ketones depending on the conditions Which of the following has highest melting point?

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Maleic ACID
Fumaric acid
Succinic acid
OXALIC acid

ANSWER :B
42.

Dichlorination of propane leads to the formation of a mixture of different isomers. The number of isomers in the mixture is-

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2
3
4
5

Answer :C
43.

Dibutyl phthalate is commonly used as a liquid in manometers. What pressure in Nm^(-2)is equivalent to a centimetre of this liquid? The density of the liquid is 1.0465 g/cc.

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SOLUTION :`102.63 NM^(-2)`
44.

Diborane undergoes unsymmetrical cleavage reactions with:

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dimethylamine
ammonia at LOW temperature
methylamine
carbon dioxide

Solution :N//A
45.

Diborane reacts with water to from :

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`HBO_2`
`H_3BO_3`
`H_3BO_3 +H_2`
`H_2`

ANSWER :C
46.

Diborane reacts with methylalcohol to give……………………

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ANSWER :trimethyloborate
47.

Diborane reacts with excess ammonia at high temperature to give…………………. .

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BORON nitride
Boron oxide
Borazole
Diborane diammonate

Answer :C
48.

Diborane is potential rocket fuel which undergoes combustion according to the reaction, B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(s))+3H_(2)O_((g))from the following data, calculate the enthalpy change for the combustion of diborane , {:(2B_((s))+(3)/(2)O_(2(g))rarrB_(2)O_(3(g)),,,Delta H=-1273 kJ),(H_(2(g))+(1)/(2)O_(2(g))rarr H_(2)O_((l)),,,Delta H=-28 kJ),(""H_(2)O_((l))rarr H_(2)O_((g)),,,Delta H=44 kJ),(2B_((S))+3H_(2)(g)rarr B_(2)H_(6(g)),,,Delta H=36 kJ):}

Answer»

Solution :`B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g)) "" DELTA H = ?`
MULTIPLY equation (2) and (3) by 3, add equation (1), (2) and (3) and then subtract equation (4) from that
`{:(""2B_((s))+(3)/(2)O_(2(g))rarr B_(2)O_(3(g)) "," Delta H=-1273 kJ mol^(-1) "".......(1)),(""3H_(2(g))+(3)/(2)O_(2(g))rarr 3H_(2)O_((L)) "," Delta H =-286xx3"".......(2)),(ul(""3H_(2)O_((l))rarr 3H_(2)O_((g)) " ," Delta H=-44xx3 "".......(3)"")),("On ADDITION " 2B_((s))+3H_(2(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g)) , Delta H=-1999),(ul(""2B_((s))+3H_(2(g))rarr B_(2)H_(6(g)) , Delta = 36"")),("On subtraction " B_(2)H_(6(g))+3O_(2(g))rarr B_(2)O_(3(g))+3H_(2)O_((g))" ,"Delta H=-2035 kJ mol^(-1)):}`
49.

Diborane is a potential rocket fuel with undergoes combustion according to the reaction B_(2)H_(6)(g) + 3O_(2)_(g) to B_(2)O_(3)(s) + 3H_(2)O(g) From the following data, calculate the enthalpy change for the combustion of diborane. 2B(s) + 3/2O_(2)(g) to B_(2)O_(3)(g), DeltaH = -1273 kJ "mol"^(-1)........(1) H_(2)(g) + 1/2O_(2) (g) to H_(2)O(l), DeltaH = -286 kJ"mol"^(-1).........(2) H_(2)O(l) to H_(2)O(g), DeltaH= 44 kJ "mol"^(-1) H_(2)O(l) to H_(2)O(g), DeltaH = 44 kJ "mol"^(-1).........(4) 2B(s) + 3H_(2)(g) to B_(2)H_(8)(g), DeltaH = 36 kJ"mol"^(-1)............(5)

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Solution :Finally, we have to get, `B_(2)H_(6)(g) + 3O_(2)(g) to B_(2)O_(3)(s) + 3H_(2)O(g)`
MULTIPLY equation (2) and (3) by 3, add 1,2,3 and substract (4) from that
(i) `2B(s) + 3//2 O_(2)(g) to B_(2)O_(3)(s), DeltaH = -1273 KJ "mol"^(-1)`
(II) `3H_(2)(g) + 3//2O_(2)(g) to 3H_(2)O(l), DeltaH = -286 xx 3 kJ"mol"^(-1)`
(III) `3H_(2)O(l) to 3H_(2)O(g), DeltaH = 132 kJ"mol"^(-1)`
(iv) `B_(2)H_(6)(g) to 2B(s)+ 3H_(2)(g), DeltaH = -36 kJ"mol"^(-1)`
---------------------------------------------------------------------------------
`B_(2)H_(6)(g) + 3O_(2)(g) to B_(2)O_(3)+ 3H_(2)O(g), DeltaH= -2035 kJ "mol"^(-1)`
50.

Diborane is a potenial rocket fuel which undergoes combustion according to the diborane. 2B(s)+ 3/2O_(2)(g) to B_(2)O_(3), Delta H = 1273 mol^(-1) H_(2)(g)1/2O_(2)(g) to H_(2)O(l), DeltaH=-286 KJ mol_(-1) 2B(s) + 3H_(2)(g) to B_(2)H_(6)(g),DeltaH= 36 kJ mol^(-1)

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ANSWER :`-2035 KJ`