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.

In which of the following reaction the single product formed is not the saytzeff's product

Answer»




ANSWER :B
Discussion
2.

In which of the following reaction there is no change in oxidation state

Answer»

`2H_(2)O_(2) to 2H_(2)O+O_(2)`
`CaCO_(3) to CaO+CO_(2)`
`2H_(2)O to 2H_(2)+O_(2)`
`2HgO to 2Hg+O_(2)`

Answer :B
Discussion
3.

In which of the following reaction, reaction standard entropy change ( DeltaS^(@)) is positive and standardGibb's free energy change ( DeltaG^(@)) decreases sharply with increasing temperature?

Answer»

C( graphite) `+ (1)/(2) O_(2)(g) rarrCO(g0`
`CO(g) + (1)/(2) O_(2)(g)rarr CO(g)`
`CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g)`
`MG(s) + (1)/(2) O_(2)(g) rarr MGO(s)`

Solution :As reaction (a) isaccompanied by increase in the number o f MOLES of gaseous substances,entropy increases, i.e., `DeltaS^(@)= + ve`. ,brgt From the relation , `DELTAG^(@) = DeltaH^(@) - TDeltaS^(@)` ,as temperature increases,`T DeltaS^(@)` increases sharply andhence, `DeltaG^(@)` decreases sharply.
Discussion
4.

In which of the following reaction, reactant(s) and product(s) are correctly matched?

Answer»




Solution :All of these reactions involve addition of carbenes at double bonds. Addition of carbene at double BOND occur in SYN orientation HENCE, STEREOCHEMISTRY of the products.
Discussion
5.

In which of the following reaction , pressure has no effect ?

Answer»

`N_(2) + 3 N_(2) hArr 2 NH_(3) (g)`
`2 SO_(2) (g) + O_(2) (g) hArr 2 SO_(3) (g)`
`N_(2) O_(4) (g) hArr 2NO_(2) (g)`
`H_2 (g) + I_(2) (g) hArr 2 HI (g)`

Solution :In the reaction `H_(2) (g) + I_(2) (g) hArr 2HI (g)` the volumes are equal on both sides and so pressure has no effect.
Discussion
6.

In which of the following reaction modification of carbon skeleton takes place ?

Answer»

SUBSTITUTION
Addition
REARRANGEMENT
ELIMINATION

ANSWER :C
Discussion
7.

In which of the following reaction, Markownikoff's rule is violated?

Answer»

`CH_(3)-O-CH=CH_(2)OVERSET(HBr)underset(C Cl_(4))(to)`
`CH_(3)-NH-CH=CH_(2)overset(HBr)underset(C Cl_(4))(to)`
`CH_(3)-S-CH=CH_(2)overset(HBr)underset(C Cl_(4))(to)`
`O_(2)N-CH=CH_(2)overset(HBr)underset(C Cl_(4))(to)`

SOLUTION :
Discussion
8.

In which of the following reaction K_(p) is equal to K_(C) ?

Answer»

<P>`N_(2) (g) + O_(2) (g) HARR 2NO (g)`
`2 NH_(3) (g) hArr N_(2) (g) + 3 H_(2) (g)`
`2 H_(2) (g) + O_(2) (g) hArr 2H_(2) O (g)`
`PCl_(5) (g) hArr PCl_(3) (g) + Cl_(2)`

Solution :`K_(C) (RT)^(Deltan_(g)) ` when `Delta n_(g) =0` then `K_(p) = K_(C)` for option (a) , `Delta n_(g) = 2- 2 = 0`
Discussion
9.

In which of the following reaction, hybridisation of carbon atom containing functional group does not change

Answer»

`CH_(3)CH_(2)Br overset("Alcohol, KOH")rarr`
`CH_(3)-CH_(2)-CH_(2)OH overset(Al_(2)O_(3) DELTA)rarr`
`CH_(3)-CH=CH_(2) + Cl_(2) rarr`
`CH_(3)-CH_(2)I + KOH rarr`

Solution :(A) `underset(underset(sp^(3))(uarr))(CH_(3))underset(underset(sp^(3))(uarr))(CH_(2))Br underset(KOH)overset("Alcohol")rarr underset(underset(sp^(2))(uarr))(CH_(2))=underset(underset(sp^(2))(uarr))(CH_(2))=underset(underset(sp^(2))(uarr))(CH_(2)) + KBr + H_(2)O`
(B) `underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(3))(uarr))(CH_(2))-underset(underset(sp^(3))(uarr))(CH_(2))OH underset(Delta)overset(Al_(2)O_(3))rarr underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(2))(uarr))(CH)= underset(underset(sp^(2))(uarr))(CH_(2)) + H_(2)O`
(C )`underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(2))(uarr))(CH_(2))=underset(underset(sp^(2))(uarr))(CH_(2)) + Cl_(2)rarr underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(3))(uarr))(CHCl)-underset(underset(sp^(3))(uarr))(CH_(2)Cl)`
(D) `underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(3))(uarr))(CH_(2))-I+ KOH rarr underset(underset(sp^(3))(uarr))(CH_(3))-underset(underset(sp^(3))(uarr))(CH_(2))-OH + KI`
Discussion
10.

In which of the following reaction, H_(2)O_(2) is acting as a reducing ageni

Answer»

`SO_(2)+H_(2)O_(2) to H_(2)SO_(4)`
`2KI+H_(2)O_(2) to 2KOH+I_(2)`
`Ag_(2)O+H_(2)O_(2) to 2AG+H_(2)O+O_(2)`
`PbS+4H_(2)O_(2) to PbSO_(4)+4H_(2)O`

Solution :`underset(+1)(Ag_(2)O)+H_(2)O_(2) to underset(0)(2Ag)+H_(2)O+O_(2)`
Discussion
11.

In which of the following reaction, entropy is decreasing ?

Answer»

MELTING of ice
Crystalisation of SUCROSE from solution
Vaporisation of camphor
Rusting of iron

Answer :B
Discussion
12.

In which of the following reaction does bydragen act as an oxidising agent?

Answer»

`H_2 + F_2 to`
`CH_2 = CH_2 + H_2 to`
`PbO_2 + H_2to`
`CA + H_2 to`

SOLUTION :Hydrogen can gain electrons when reacts with metals like Ca and ACT as OXIDISING agent.
`Ca + H_2 to CaH_2`
Discussion
13.

In which of the following reaction carbon number does not change on product formation ? (i) Hydrogenation (ii) Alkyl halide reduction (iii) Wurtz reaction (iv) Decarboxylation (v) Kolbe reaction

Answer»

Solution :CARBON number does not change in product for the following REACTION (i) HYDROGENATION and (II) ALKYL halide reduction reaction.
Discussion
14.

In which of the following reaction, aromatic character is retained?

Answer»

`C_(6)H_(6)overset(H_(2)//NI)toX`
`C_(6)H_(6)UNDERSET(Zn//H_(2)O)overset(O_(3))toY`
`C_(6)H_(6)underset(AlCl_(3))overset(CH_(3)COCL)toQ`
`C_(6)H_(6)underset("light")overset(Cl_(2))TOR`

Solution :Acetylation is substitution.
Discussion
15.

In which of the following reaction, a visible change would be observed?

Answer»

1-butene + HCl (AQ) `to`
2-butene + `Cl_2 underset(FeCl_3)OVERSET(C Cl_4)to`
1-pentyne + `HgSO_4 overset(H_2SO_4)to`
1-pentyne + `NaNH_2(aq)to`

Solution :TERMINAL alkyne react with `NaNH_2` giving EFFERVESCENCE of `NH_3`
Discussion
16.

In which of the following reactant and product are correctly matched.

Answer»




Solution :Cl group is O,P directing group
MAKES `Br^(+)` to ATTACKED on PARA position
Discussion
17.

In which of the following property, hydrogen does not resemble with halogen

Answer»

ATOMICITY
Ionisation enthaply
Reducing nature
Elecrapositive nature

SOLUTION :PROPERTIES LIKE ionisation enthalpy, reducing nature does not resemble with halogen.
Discussion
18.

In which of the following properties, the two enantiomers of lactic acid differ from each other?

Answer»

SIGN of SPECIFIC rotation
Density
Melting point
Refractie indes

Answer :C
Discussion
19.

In which of the following product will be aldehyde

Answer»

<P>`(CH_(3))_(2)C=C(CH_(3))_(2)overset(03)underset(Zn//H_(2))rightarrow`
`CH_(3)CH=CH_(2)overset(CO //H_(2))underset(Delta,[CO(CO)_(8)])rightarrow`
`CH_(3)CH=CH_(2)overset(Pdcl_(2),H_(2)O)underset(CuCl_(2))rightarrow`
`CH_(3)- C -= CH overset(HgSO_(4))underset(H_(2)SO_(4)//H_(2)O)rightarrow`

Solution :Oxo PROCESS or hydroformylation of alkene. Alkene with water gas at high T & P in the presence of cobalt carbonyl forms ALDEHYDE.
Discussion
20.

In which of the following process maximum energy is released

Answer»

`O_((g)) + E^(-) rarr O_((g))^(-)`
`O_((g))^(-) + e^(-) rarr O_((g))^(-2)`
`S_((g)) + e^(-) rarr S_((g))^(-)`
`S_((g))^(-) + E rarr S_((g))^(-2)`

ANSWER :C
Discussion
21.

In which of the following process, the process is always non-feasible?

Answer»

`DELTAH gt 0, DeltaS gt 0`
`DeltaH LT 0, DeltaS gt 0`
`DeltaH gt 0, DeltaS lt 0`
`DeltaH lt 0 , DeltaS lt 0`

ANSWER :C
Discussion
22.

In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements ?

Answer»

`underlineNO_(2)andunderlineN_(2)O_(4)`
`underlineP_(2)O_(5)andunderlineP_(4)O_(10)`
`underlineN_(2)OandunderlineNO`
`underlineSO_(2)andunderlineSO_(3)`

Answer :D
Discussion
23.

In which of the following pairs the two species are not isostructural ?

Answer»

`PCl_(4)^(+) and SiCl_(4)`
`PF_(5) and BrF_(5)`
`AlF_(6)^(3-) and SF_(6)`
`CO_(3)^(2-) and NO_(3)^(-)`

Solution :`PF_(5) and BrF_(5)`
`PF_(5) rArr` trigonal bipyramidal
`BrF_(5) rArr` square pyramidal
`AIF_(6)^(3-) and SF_(6)` both are octahedral, `CO_(3)^(2-) and NO_(3)^(-)` both are trigonal PLANAR.
Discussion
24.

In which of the following pairs, the two species are lso-structure ?

Answer»

`SO_(3)^(2-) and NO_(3)^(-)`<BR>`BF_(3) and NF_(3)`
`BrO_(3)^(-) and XeO_(3)`
`SF_(4) and XeF_(4)`

Solution :`BrO_(3)^(-) and XeO_(3)`
HYBRIDIZATION of Br is `BrO_(3)^(-)`
Total valence electrons = 7 + 3 `xx 6 ` = 25
Charge = -1 hence
Total 25 +1 = 26
`= (26)/(8) = 3 ` (Q) + 2 (R) = 5
Hybridization= `dsp^(3)`
Hybridization of Xe in` XeO_(3)`
Total valence electrons = 8 + 3 `xx 6` = 26
= ` (26)/(8) = 3 (Q) + 2 (R) = 5 `
Hybridization = `dsp^(3)`
In both cases , the structure is TRIGONAL pyramidal.
Discussion
25.

In which of the following pairs, the ions are isoelectronic? Na^(+), Mg^(2+)""(ii) Al^(3+), O^(-) (iii)Na^(+), O^(2-) ""N^(3-), Cl^(-)

Answer»

Only (i)
Both (i) & (III)
Both (iii) & (IV)
Only (ii)

ANSWER :B
Discussion
26.

In which of the following pairs, the ions are isoelectronic ?

Answer»

`Na^(+), MG^^(2+)`
`Al^(3+), O^(-)`
`Na^(+), O^(2-)`
`N^(3), Cl^(-)`

Solution :`Na^(+) = 11 -1 = 10 e^(-), Mg^(2+) = 12 -2 = 10 e^(-)`. THUS, they have same no. of electrons
`Al^(3+) = 13 -3 = 10 e^(-), Q^(2-) = 8 + 2 = 10 e^(-)`. They have same no. of electrons
`N^(3-) = 7 + 3 = 10 e^(-), Cl^(-) = 17 + 1 = 18 e^(-)`. They do not have same no. of electrons
Discussion
27.

In which of the following pairs, the ions are iso electro n ic ?

Answer»

`Na^(+), Mg^(2+)`
`Al^(3+) , O^(-)`
`Na^(+) , O^(2-)`
`N^(3-), Cl^(-)`

Solution :For, `N^(a+) = 11 - 1 = 10^(e-) Mg^(2+) = 12 - 2 = 10^(e-)` So, they have sam e num ber of electrons. For, `Al^(3+) = 13 - 3 = 10^(e-),O^(-1) = 8 + 1 = 9e^(-1)` They do not have sam e n u m b ER of electrons.For, `N^(a+) = 10^(e-) , O^(2-) = 8 + 2 = 10e^(-)` They have sam e num ber of electrons. For, `N^(3-) = 7 + 3 = 10 e , Cl^(-) = 17 + 1 = 18e^(-)`They do not have sam e num ber of electrons. So, Na+ is isoelectronic w ITH `Mg^(2+)` and `O^(2-)`
Discussion
28.

In which of the following pairs, the hybridisation of central atoms is same, but geometry is not the same?

Answer»

`SO_(3),CO_(3)^(2-)`
`SO_(3)^(2-),NH_(3)`
`PCl_(5),POCl_(3)`
`XeF_(2),Icl_(3)`

Answer :D
Discussion
29.

In which of the following pairs the bromination of first member is easier than the second member ?

Answer»

ISOBUTANE, n-Butane
n-Butane, Isobutane
Methane, Ethane
None of these

Answer :A
Discussion
30.

In which of the following pairs, the first atom or ion is not larger than the second ?

Answer»

`K, K^(+)`<BR>`S, O`
`Br, Br ^(-)`
`N,O`

ANSWER :C
Discussion
31.

In which of the following pairs size of 1^(st) element is higher as compare to India?

Answer»

SC,Zn
Sc,La
Cu,Ag
Hf,La

Answer :A
Discussion
32.

In which of the following pairsof molecules/ions, both the species are not likely to exist ?

Answer»

`H_(2)^(-) , H_(2)^(2+)`
`H_(2)^(+) , He_(2)^(2-)`
`H_(2)^(-) , He_(2)^(2-)`
`H_(2)^(2+)`, He_(2)`

SOLUTION :Both `H_(2)^(2+) and He_(2)` have zero bond ORDER and hence
do not exist .
Discussion
33.

In which of the following pairs of resonating structures first resonating structure is more stable than second ?

Answer»




ANSWER :B::C
Discussion
34.

In which of the following pairs of molecules/ ions, the central atoms have sp^(2) hybridization ?

Answer»

`NO_(2)^(-) and NH_(3)`
`BF_(3) and NO_(2)^(-)`
`NH_(2)^(-) and H_(2)O`
`BF_(3) and NH_(2)^(-)`

Solution :`BF_(3) and NO_(2)^(-)`
`BF_(3) : (3 + 3)/(2) = 3 " means " sp^(2) `
`NO_(2)^(-) : (5 + 1)/(2) = 3 " means " sp^(2)`
Discussion
35.

In which of the following pairs of compounds, will second structure have more contribution to resonance hybrid than first ?

Answer»



`F-underset(NH_(2))underset(|)overset(o+)(C)-OH " & " overset(o+)(F)-underset(NH_(2))underset(|)(C)-OH`

ANSWER :A::B::C::D
Discussion
36.

In which of the following pairs of compounds, carbon atom is not sp^(2) hybmridised?

Answer»

butanal, butan-2-ol
butanoic, acid, butanone
pentanamide, pent-1-ene
2-methyl propana-2-ol, butan-2-ol

Solution :Bu tanal
`CH_(3)-CH_(2)-CH_(2)-underset(underset(sp^(2))(uarr))overset(overset(O)(||))(C )-H`
Bu tane-2-ol `CH_(3)-CH_(2)-overset(overset(OH)(|))(C )H-CH_(3)` All carbon `sp^(3)`
(B) butanoic acid `CH_(3) CH_(2)CH_(2)- underset(underset(sp^(2))(uarr))overset(overset(O)(||))(C )-OH`
butanone `CH_(3)-underset(underset(sp^(2))(uarr))overset(overset(O)(||))(C )-CH_(2)-CH_(3)`
(C )PENTAN AMIDE `CH_(3)CH_(2)CH_(2)CH_(2)- underset(underset(sp^(2))(uarr))overset(overset(O)(||))(C )-NH_(2)`
pent-1-ene `CH_(3)CH_(2)CH_(2) underset(underset(sp^(2))(uarr))(CH)= underset(underset(sp^(2))(uarr))(CH_(2))`
(D) 2-methyl propan-2-ol `CH_(3)- underset(underset(OH)(|))overset(overset(CH_(3))(|))(C )-CH_(3)` All CARBONS are `sp^(3)`
butane-2-ol `CH_(3)CH_(2)- overset(overset(OH)(|))(C )HCH_(3)` All carbons are `sp^(3)`
Discussion
37.

In which of the following pairs is the probability of finding the electron in xy-plane zero both orbitals?

Answer»

`3d_(yz),4d_(X^(2)-y^(2))`
`2p_(Z),d_(z^(2))`
`4d_(zx)`, `3p_(z)`
none of these

Answer :D
Discussion
38.

In which of the following pairs of compounds are the two members of the pair constitutional isomers?

Answer»

methoxymethane and ethoxyethane
pentanol and pentanediol
propyl alcohol and di-n-propyl ether
isobuty alcohol and diethyl ether

Solution :`CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-OH`
`CH_(3)-CH_(2)-O-CH_(2)-CH_(3)`
Same MOLECULAR FORMULA but different in structure.
Discussion
39.

In which of the following pairs IInd compound has less resonance energy :

Answer»

`CO_(3)^(2-) & HCOO-`


ANSWER :A::D
Discussion
40.

In which of the following pairs IInd compound has higher resonance energy :

Answer»




`CH_(2)=CH-OH & CH_(2)=CH-CH=CH-OH`

ANSWER :A::C::D
Discussion
41.

In which of the following pairs do both the metals have identical values of metallic radii-

Answer»

AG and Au
Cu and Ag
Cu and Zn
Zn and Hg

Answer :A
Discussion
42.

In Which of the following pairs I is more stable than II ?

Answer»




SOLUTION :
STABLE than C=N
B) C= O stable than C = N
c) C = O stable than C = N
d) C = O stable than C = N
Discussion
43.

In which of the following pairs, both the species have the same hybridisation ?

Answer»

`SF_(4),XeF_(4)`
`I_(3)^(-) XeF_(2)`
`ICI_(4)^(+), SiCI_(4)`
`CIO_(3)^(-),PO_(4)^(3-)`

ANSWER :B::D
Discussion
44.

In which of the following pairs, both the species are not isostructural-

Answer»

`SiCl_(4),PC l_(4)^(+)`
diamond, SiC
`NH_(3),PH_(3)`
`XeF_(4),XeO_(4)`

SOLUTION :(i)
(ii) Diamond and SILICON carbide `(SiC)` BOND are isostructural because their CENTRAL atom is `sp^(3)` hybridised and both have tetrahedral arrangement.
(iii)
Both `NH_(3)` and `PH_(3)` have pyramidal GEOMETRY.
(iv) `XeF_(4)` has `sp^(3)d^(2)` hybridisation while `XeO_(4)` has `sp^(3) ` hybridisation.

Hence, `XeF_(4) and XeO_(4)` are not isostructural.
Discussion
45.

In whichof the followingpairsboth thespecieshavenearlythe samesize ?

Answer»

`K^(+) F^(-)`
`Rb^(+) ,O^(2-)`
`Li^(+) ,Mg^(2+)`
`Mg^(2+) ,A1^(3+)`

SOLUTION :Only`Mg^(2+)` (65 pm ) andA1 (50 pm)havewidelydifferentsizeswhile allothershave nearlythe SAMESIZE `K^(+) (133 pm) F^(-)(136 pm), Rb^(+)(147) pm) O^(2-)(140 pm)` and `Li^(+) (60 pm), Mg^(2+)(65 pm)`
Discussion
46.

In which of the following pairs, both molecules poses dipole moment?

Answer»

`CO_2 ,SO_2`
`BCl_3 ,PCl_3`
`H_2 O ,SO_2`
`CO_2 CS_2`

ANSWER :C
Discussion
47.

In which of the following pair of compounds the first one is more ractive than second in the same electrophilic aromatic substitution reaction.

Answer»

m-xylene, p-xylene
m-dichlorobenzene,chloro benzene
Benzene, vinyl benzene
Toluene, isopropyl benzene

Solution :M-Xylene INCREASES electron DENSITY on benzene ring more COMPARE to P-Xylene
META di chloro benzene increases electron density more compare to chloro benzene.
Discussion
48.

In which of the following pairs A is more stable than B ?

Answer»




`Ph_(3)C^(*),(CH_(3))C^(*)`

ANSWER :D
Discussion
49.

In which of the following pair of compounds, oxidation number of P atoms are same?

Answer»

`H_(3)PO_(2)andH_(3)PO_(4)`
`H_(3)PO_(4)andH_(4)P_(2)O_(7)`
`H_(3)PO_(2)andH_(3)PO_(3)`
`H_(3)PO_(3)andH_(3)PO_(4)`

Solution :(i) `H_(3)PO_(2):3(H)+P+2(O)=0`
`therefore3(+1)+X+2(-2)=0`
`thereforex=+1`
(II) `H_(3)PO_(4):3(+1)+(P)+4(O)=0`
`therefore3(+1)+x+4(-2)=0`
`thereforex=+5`
(iii) `H_(4)P_(2)O_(7):4(H)+2(P)+7(O)=0`
`therefore4(+1)+2(x)+7(-2)=O`
`thereforex=+5`
(iv) `H_(2)PO_(3): 3(H)+P+3(O)=0`
`3(+1)+x+3(-2)=0`
`thereforex=+3`
From the above calculation
Discussion
50.

In which of the following pair IInd compound is weaker base.

Answer»


`CH_(2)=CH-CH=CH-overset(ө)(C)H_(2)" or "CH_(2)=CH-overset(ө)CH_(2)`
`O^(-)-overset(overset(O)(||))(C)-overset(overset(O)(||))(C)-OH" or "HO-overset(overset(O)(||))(C)-overset(overset(O)(||))(C)-OH`

ANSWER :A::C::D
Discussion