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.

The most unsymmetrical crystal system is ______

Answer»


ANSWER :TRICLINIC
Discussion
2.

The most unsymmetrical crystal system is ________

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ANSWER :BRAVAIS LATTICES
Discussion
3.

The most unstable carbocation is:

Answer»

`Ch_(3)underset(o+)CH_(2)`
`Cl-CH_(2)-overset(o+)CH_(2)`
`overset(o+)CH_(2)-CHO`
`overset(o+)CH_(2)-O-CH_(3)`

Answer :C
Discussion
4.

The most unstable carbocation, amongst the following, is

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`(CH_3)_(3)C^(+)`
`(CH_3)_(2)CH^(+)`
`CH_(3) - CH_(2)^(+)`
`CH_(3)^(+)`

SOLUTION :CONDITIONS of homolytic fission
Discussion
5.

The most unlikely representation of resonance structures of p-nitrophenoxide ion is

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SOLUTION :The STRUCTURE C is not possible for p-nitropheoxide ION as nitrogen cannot have 10 ELECTRONS in its valence SHELL.
Discussion
6.

The most unlikely representation of resonance structure of p-nitrophenoxide is

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Solution :NITROGEN in option (c) has two double bonds and one single BOND. THEREFORE, it has `10 (2 XX 4 + 1 xx 2)` electrons in the valence shell. This is against octet rule and HENCE resonance structure (c) is most unlikely.
Discussion
7.

The most unlikely representation of resonance structures of p-nitrophenoxide ion is :

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ANSWER :C
Discussion
8.

The most unlikely representation of resonance structure of P-nitrophenoxide.

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ANSWER :C
Discussion
9.

The most suitable reagent for the conversion ofRCH_(2)OH rarr RCHO is

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`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`CrO_(3)`
PCC (pyridine chloro chromate)

ANSWER :D
Discussion
10.

The most suitable reagent for the conversion of R-CH_(2)-OH rarr R-CHO is :

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`KMnO_(4)`
`K_(2)Cr_(2)O_(7)`
`CrO_(3)`
PCC (PYRIDINIUM CHLOROCHROMATE)

Answer :D
Discussion
11.

The most suitable reagent for the conversion of primary alcohol into aldehyde with the same number of carbon atom is

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ACIDIFIED `K_(2)Cr_(2)O_(7)`
acidified `KMnO_(4)`
alkaline `KMnO_(4)`
pyridinium `KMnO_(4)`

ANSWER :D
Discussion
12.

The most suitable method of separation of 1:1 mixture of ortho- and para-nitrophenols is

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chromatography
crystallisation
steam distillation
sublimation

SOLUTION :The o-and p-nitrophenol are SEPARATED by steam distillation SINE o-isomer is steam-volatile due to chelation (intramolecular H-bonding) while p-isomer is not steam-volatile due to association of MOLECULES by INTERMOLECULAR H-bonding.
Discussion
13.

The most stable resonating structure of CH_(3) - O - CH = CH is

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`CH_(3) - UNDERSET(* *)overset(* *)O - Coverset(Theta)H-overset(OPLUS)CH_(2)`
`CH_(3) - overset(oplus)O = CH - overset(oplus)CH_(2)`
`CH_(3) - overset(oplus)underset(* *)O = CH - overset(oplus)CH_(2)`
`CH_(3) - O = overset(oplus)CH-overset(oplus)CH_(2)`

Solution :STRUCTURE 2 is only possible RESONATING structure
Discussion
14.

The most stable radical among the following is

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ANSWER :D
Discussion
15.

The moststableoxidation state of aluminum is "……………."while that of thallium is "…………..".

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ANSWER :`+3,+1`
Discussion
16.

The most stable oxidation state of chromium is

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`+5`
`+3`
`+2`
`+4`

Solution :Cr EXHIBITS `+6,+5,+4,+3,+2` but most STABLE O.N is +3
Discussion
17.

The most stable methylated alkene is

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`UNDERSET(underset(H_(3)C)(|))OVERSET(overset(H_(3)C)(|))(C )= underset(underset(CH_(3))(|))overset(overset(CH_(3))(|))(C )`
`underset(underset(H_(3)C)(|))overset(overset(H_(3)C)(|))(C )= underset(underset(CH_(3))(|))overset(overset(H)(|))(C )`
`underset(underset(H_(3)C)(|))overset(overset(H_(3)C)(|))(C )= underset(underset(H)(|))overset(overset(H)(|))(C )`
`underset(underset(H)(|))overset(overset(H_(3)C)(|))(C )= underset(underset(H)(|))overset(overset(H)(|))(C )`

Answer :A
Discussion
18.

The most stable hydroxide is

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`LIOH`
`NAOH`
`KOH`
`CSOH`

ANSWER :D
Discussion
19.

The most stable free radical which can be isolated is

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Trityl radical
Diphenyl METHYL radical
2,4,6-Tri-ter-butylphenoxy radical
tert-butyl radical

Answer :C
Discussion
20.

The most stable free radical is

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`C_6H_5-overset(C_6H_5)overset(|)UNDERSET(C_6H_5)underset(|)(C^(@))`
`CH_(3)-overset(CH_3)overset(|)underset(CH_3)underset(|)(C^(@))`
`CH_3CH_2CH^@CH_3`
`CH_3CH_2CH_2C^@H_2`

Solution : More CONJUGATION
Discussion
21.

The most stable free radical among the following is

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ANSWER :D
Discussion
22.

The most stable form of carbon at high temperature is X. The C - C bond length in diamond is Y while C - C bond length is graphite is Z. What are X,Y and Z respectively?

Answer»

Graphite `1.42 Å, 1.54 Å`
COKE, `1.54 Å, 1.84 Å`
Diamond, `1.54 Å, 1.42 Å`
Fullerene, `1.54 Å, 1.54 Å`

SOLUTION :X = diamond, `Y = 1.54 Å, Z = 1.42 Å`
Discussion
23.

The most stable form of trans 1,2 dimethyl cyclo hexane?

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(1E, 2E)
(1a, 2a)
(1e, 2a)
(1a, 2e)

SOLUTION :STABILITY.
Discussion
24.

The most stable electrophile is

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`R_(3)overset(OPLUS)(C)`
`C_(6)Hoverset(oplus)(C)H_(2)`
`(C_(6)H_(5))_(3)overset(oplus)(C)`
`(CH_(3))_(2)overset(oplus)(C)(H)`

SOLUTION :Among the given carbo cataions tertiary PHENYL carbocation is more stable due to resonance effect
Discussion
25.

The most stable conformer of butane is ……………………

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SOLUTION :STAGGERED
Discussion
26.

The most stable conformation of n-butane is

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Gauche
Staggered
Skew boat
Eclipsed

Answer :A::B::D
Discussion
27.

Most stable carbocation among the following is

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Anti
Gauche
Partially eclipsed
Fully eclipsed

Solution :
Discussion
28.

The most stable conformation of ethylene glycol is

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anti
gauche
Partially ECLIPSED
FULLY eclipsed

SOLUTION :
Discussion
29.

The most stable conformation of Butane is

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Gauche-form
Partially ECLIPSED form
Anti-form
Eclipsed form

Answer :A
Discussion
30.

The most stable carbonium ion is

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SOLUTION :More no.of RESONATING STRUCTURES and two adjacent rings having aromatic nature
Discussion
31.

The most stable carbocation is

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ANSWER :B
Discussion
32.

The most stable carbocation is:

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ANSWER :A
Discussion
33.

The most stable carbanion is

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`CH_(3)-CH_(2)^(-)`
`CH_(2)=CH^(-)`
`CH_(2)-=C^(-)`
`(CH_(3))_(2)-CH^(-)`

SOLUTION :N/A
Discussion
34.

The most stable carbanion among the following is

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Solution :`-NO_(2)` group, being strong electron-withdrawing , DISPERSES the -ve charge, HENCE stabilizes the CONCERNED carbonion.
Discussion
35.

The most stable anion is:

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ANSWER :A
Discussion
36.

The most stable alkene is

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`CH_(2)=CH-CH_(2)-CH_(3)`
`CH_(2) = UNDERSET(CH_(3))underset(|)C -CH_(2) `
`CH_(2) = CH-CH=CH_(2)`
`CH_(3)-CH=CH-CH_(3)`

SOLUTION :N/A
Discussion
37.

The most stable alkene among the following is

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ANSWER :A
Discussion
38.

The most satisfactory method of separating sugars from each other is:

Answer»

fractional CRYSTALLIZATION
SUBLIMATION
chromatography
Benedict solution

Solution :Sugars are easily separated by chromato GRAPHY.
Discussion
39.

The most reactive nucleophile among the following is

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`CH_(3)O^(-)`
`C_(6)H_(5)O^(-)`
`(CH_(3))_(2)CHO^(-)`
`(CH_(3))_(3)CO^(-)`

Solution :`CH_(3)-OVERSET(-)(O)` is the most reactive nucleophile as it is least sterically hindered one.
Discussion
40.

The most reactive state of hydrogen is

Answer»

Atomic hydrogen
HEAVY hydrogen
MOLECULAR hydrogen
NASCENT hydrogen

Solution :atomic Hydrogen is more reactive
Discussion
41.

The most reactive nucleophile among the following is :

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`CH_(3)O^(-)`
`C_(6)H_(5)O^(-)`
`(CH_(3))_(2)CHO^(-)`
`(CH_(3))_(3)CO^(-)`

Solution :More the number of `CH_(3)` groups with `+ I` EFFECT GREATER is the reactivity of the nucleophile. The correct answer is (d)
Discussion
42.

The most recive isotope of H is

Answer»

`""_(1)H^(1)`
`""_1H^(2)`
`""_1H^3`
All have REACTIVITY

SOLUTION :ORDINARY hydrogen is more reactive
Discussion
43.

The most reactive compound towards electrophilic substitution is

Answer»

Benzene carbaldehyde
Benzene
NITROBENZENE
Benzene sulphonic acid

Solution :`-CHO, - NO_2 and -COOH` GROUPS ATTACHED to benzene ring are dactivating .
Discussion
44.

The most probable speed of O_(2) molecules at T(K) is

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`sqrt((RT)/(4 pi))` 
`sqrt((RT)/(16pi))`
`sqrt((RT)/(16))`
`sqrt((3RT)/(32))`

Answer :C
Discussion
45.

The most probable velocity of the molecules is given by (m is mass of a molecule)

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`SQRT((3KT)/(m))`
`sqrt((8KT)/(m))`
`sqrt((2KT)/(m))`
`sqrt((2KT)/(PI m))` 

ANSWER :B
Discussion
46.

The mostprobableradius(in pm) for findingthe electronin He^(+) is

Answer»

0
52.9
26.5
105.8

Solution :Mostprobableradius`=a_(0)//Z`
where `a_(0) =52.9` pm forheliumionz=2
`r_(map) = (52.9)/( 2) = 26.45 pm`
Discussion
47.

The most probable kinetic energy of a gas molecule

Answer»

`(KT)/(2)`
`kT`
2kT
RT

Answer :a
Discussion
48.

The most probable radius (in pm) for finding the electron in He^(+) is

Answer»

`0.0`
`52.9`
`26.5`
`105.8`

Solution :`r_(n) = (52.9 xx n^(2))/(Z)` pm
`:.` For `H^(+), r_(1) = (52.9 XX1^(2))/(2) = 26.5` pm
Discussion
49.

The most probable velocity of the molecules of a gas is 1 km/sec. The R.M.S velocity of the molecules is

Answer»

`1.128km//SEC`
`1.224km // sec`
`1.5km //sec`
`1.086km // sec`

ANSWER :B
Discussion
50.

Themost powerful oxidizing agent in the following is

Answer»

`H_(3)Bo_(3)`
`HPO_(3)`
`H_(3)PO_(4)`
`H_(2)SO_(4)`

Solution :In `H_(2)SO_(4)` , SULPHUR is in its HIGHEST oxidationstate (+6) . Hence `H_(2)SO_(4)` is the most powerful oxidation agent
Discussion