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 halogen addition reactions, racemic mixture of products is formed?

Answer»




`CH_3 - CH = CH_2 + Br_2 - C Cl_4 OVERSET(FeCl_3)to`

SOLUTION :
Discussion
2.

In which of the following, given tautomer has less contwnt at equilibrium?

Answer»




SOLUTION :
Discussion
3.

In which of the following group, each member gives a positive iodoform test

Answer»

methanol, ethanol, propanone
ethanol, isopropanol, methanal
ethanol, ethanal, ISOPROPYL alcohol
propanal, propanol-2, propanone

Solution :Iodoform test is given by compounds CONTAINING
`CH_(3)-OVERSET(OH)overset(|)(CH) or CH_(3)-overset(O)overset(||)(C)-"group"`
`CH_(3)-overset(OH)overset(|)(CH)-H"Ethanol"`
`CH_(3)-overset(O)overset(||)(C)-H "Ethanal"`
`CH_(3)-overset(OH)overset(|)(CH)-CH_(3) "Isopropyl alcohol"`
Discussion
4.

In which of the following geometrical isomerism is possible ?

Answer»

`CH_(3)CH=C(CH_(3))_(2)`
`C_(6)H_(5)N=NC_(6)H_(5)`
`CH_(3)CH=CH_(2)`
All of these

Answer :B::C
Discussion
5.

In which of the following functional groups, isomerism is not possible ?

Answer»

Alcohols
Aldehydes
ALKYL HALIDES
Cyanides

Solution :Alkyl halides donot SHOW any functional isomerism.
Discussion
6.

In which of the following, functional group isomerism is not possible?

Answer»

Alcohols
Aldehydes
Alkyl halides
Cyanides

Answer :C
Discussion
7.

In which of the following, functional group isomerism is not possible ?

Answer»

Alcohols
Aldehydes
Alkyl halides
Cyanides

Solution :Alcohols and ethers , aldehydes and KETONES, cyanides and ISOCYANIDES are functional group ISOMERS. Alkyl halides, HOWEVER, do not SHOW functional group isomerism.
Discussion
8.

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

Answer»

`Coverset(Theta)H_(2)-CH=OlarrrarrCH_(2)=CH-O^(Theta)`
`Coverset(o+)H_(2)-O-CH_(3)larrrarrCH_(2)=overset(o+)O-CH_(3)`
`CH_(2)=CH-NH_(2)larrrarrCoverset(Theta)H_(2)-CH=overset(o+)NH_(2)`
`overset(o+)O-CH=CH_(2)larrrarrO=CH-overset(o+)CH_(2)`

Answer :C
Discussion
9.

In which of the following equilibrium, the value of K_(p) is less than K_(c) ?

Answer»

<P>`N_2O_4 harr 2NO_2`
`N_2+O_2 harr 2NO`
`N_2+3H_2 harr 2NH_3`
`2SO_2 + O_2 harr 2SO_3`

Solution :`K_(P)=K_(C)(RT)^(Delta ng)` is CONSTANT at EQUILIBRIUM `K_(P) lt K_(C) implies Delta ng lt 0`
Discussion
10.

In which of the following equilibrium, K_P and K_C are not equal ?

Answer»

`2NO(G) HARR N_2(g)+ O_2(g)`
`SO_2(g)+ NO_2(g) hArr SO_3(g)+ NO(g)`
`H_2(g) + I_2(g)hArr 2HI(g)`
`PCl_5(g) hArr PCl_3(g)+ Cl_2(g)`

Solution :For reactions given in options (a), (B) and ( c) `Deltan_g = 0`
For option (d) `Deltan_g = 2-1=1`
`:. K_P = K_C (RT)`
Discussion
11.

In which of the following equilibrium, K_(p) and K_(c) are not equal ?

Answer»

`2NO(g)hArrN_(2)(g)+O_(2)(g)`
`SO_(2)(g)+NO_(2)hArrSO_(3(g))+NO(g)`
`H_(2)(g)+I_(2)(g)hArr2HI(g)`
`PCl_(5)(g)hArrPCl_(3)g+Cl_(2)(g)`

Answer :D
Discussion
12.

In which of the following equilibrium K_c and K_p are not equal ?

Answer»

`2NO_((G)) HARR N_(2(g)) +O_(2(g))`
`SO_(2(g)) + NO_(2(g)) hArr SO_(3(g)) + NO_((g))`
`H_(2(g)) + I_(2(g)) hArr 2HI_((g))`
`2C_((s)) + O_(2(g)) hArr 2CO_(2(g))`

Solution :`2C_((s)) + O_(2(g)) hArr 2CO_(2(g))`
`Deltan`=2-1=+1
`therefore K_p` and `K_c` are not equal.
Discussion
13.

In which of the following equilibrium, change in pressure will not affect the equilibrium ?

Answer»

`N_(2(g))+3H_(2(g))hArr2NH_(3(g))`
`H_(2(g))+I_(2(g))hArr2HI_((g))`
`PCl_(5(g))hArrPCl_(3(g))+Cl_(2(g))`
`N_(2)O_(4(g))hArr2NO_(2(g))`

ANSWER :B
Discussion
14.

In which of the following equations, Delta H ^(0)reaction equals to Delta H _(f) ^(0) for the product ?

Answer»

`2CO _(2 (G)) + O _(2 (g)) to 2 CO _(2 (g))`
`N _(2 (g)) + O _(3 (g)) to N _(2 ) O _(3 (g))`
`CH _(4 (g)) + 2 C _(2 (g)) to CH _(2) Cl _(2 ) (L) + 2HCL _((g))`
`Ce _((g))+ 2 F _(2 (g)) to Ce F _(4 (g))`

Answer :D
Discussion
15.

In which of the following entropy increases?

Answer»

RUSTING of IRON
MELTING of ice
Crystallization of SUGAR from solution
Vaporisation of camphor

Answer :a,B,d
Discussion
16.

In which of the following entropy decreases?

Answer»

MELTING of ice
evaporation of water
crystallization of sugar
dissolution of salt

ANSWER :C
Discussion
17.

In which of the following does the reaction go almost to completion ?

Answer»

`K_(C)=10^(3)`
`K_(c)=10^(2)`
`K_(c)=10^(-2)`
`K_(c)=10^(-3)`

Answer :A
Discussion
18.

In which of the following conversions there are changes of hybridisation and shape-

Answer»

`CH_(4) to C_(2)H_(6)`
`NH_(3) to NH_(4)^(o+)`
`BF_(3) to BF_(4)^(Theta)`
`H_(2)O to H_(3)O^(o+)`

Solution :`BF_(3)` molecule exhibits trigonal planar geometry with each F-B-F bond ANGLE `120^(@)`. B ATOM is `sp^(2)` hybridised.

`BF_(4)^(-)` on the other hand exhibits tetrahedral geometry with each F-B-F bond angle `109.5^(@)`. B-atom is `sp^(3)`-hybridised.
Discussion
19.

In which of the following conversion Fe_2O_3//Crcatalyst is used.

Answer»

`C + H_2O to CO + H_2`
`CO + H_2O to CO_2 +H_2`
`CO+ H_2to CH_3OH`
`CO + 3H_2to CH_4 + H_2O`

ANSWER :B
Discussion
20.

In which of the following conversion brought about by H_2O_2 , maximum number of electrons are involved in the redox process

Answer»

Lead sulphide to lead sulphate
FERROUS sulphate to Ferric sulphate
IODIDE ION to iodine
Ferrocyanide to FERRICYANIDE

Answer :A
Discussion
21.

On which of the following factors does internal energy depend upon

Answer»

`q =500 J,W 200J`
`1 =- 400 J, W =+200J`
`q =500J, W =200J`
`q =400J,Q=100J`

ANSWER :C
Discussion
22.

In which of the following compounds , the oxidation number of iodine is fractional ?

Answer»

`IF_(7)`
`I_(3)^(-)`
`IF_(5)`
`IF_(3)`

ANSWER :B
Discussion
23.

In which of the following compounds transition metal is in zero oxidation state ?

Answer»

`[Co(NH_(3))_(6)]Cl_(3)`
`[Fe(H_(2)O)_(5) NO] SO_(4)`
`Fe(CO)_(5)`
`K_(3) [Fe(CN)_(6)]`

Answer :C
Discussion
24.

In which of the following compounds the percentage of carbon atom is highest ?

Answer»

`CH_(3)-CH_(2)-CH_(3)`
`underset("OH")underset("|")(CH_(3)-CH-CH_(3))`
`C_(12)H_(22)O_(11)`
`CH_(3)COOH`

Solution :% C `=(100xx "wt. of carbon")/("molecular mass")`
(A) `CH_(3)CH_(2)CH_(3) -= C_(3)H_(8)`
`= 3 (C) + 8 (H)`
`= 3 (12) + 8 (1)`
`= 36 + 8`
`= 44 g* "mol"^(-1)` and36 g Carbon in it.
% C `= (100xx36)/(44) = 81.818 % C`......(A)
`underset("OH")underset("|")(CH_(3)+CH-CH_(3)-=C_(3)H_(8)O)`
`3(C) + 8(H) + 1(16)`
`= 36+8 + 16`
`= 60 g "mol"^(-1)` and 36 g C in it.
`% C = (100xx36)/(60) = 60% C `.........(B)
(C) `C_(12)H_(22)O_(11)`
`= 12(C) + 22(H) +11(O)`
`= 12(12)+22(1) + 11(16)`
`= 144+22+176`
`= 342g* "mol"^(-1)` and144 g C in it.
`% C = (144xx100)/(342) = 42.105% C`......(C)
(D) `CH_(3)COOH -= C_(2)H_(4)O_(2)`
`=2(C)+4(H) +2(O)`
`=2(12)+4(1)+2(16)`
`= 24+4+32`
`= 60 g "mol"^(-1)`and `24 g` C in it.
`%C = (24)/(60) XX 100 = 40% C `.......(D)
Discussion
25.

In whichone of the following compounds the oxidation numberof iodine is fractional?

Answer»

`IF_7`
`I_3^(-)`
`IF_5`
`IF_3`

Solution :`OVERSET(+7)(IF)_(7),I_(3)^(-),x=(-1)/3,overset(+5)(IF_5),overset(+3)(IF_3)`
Discussion
26.

In which of the following compounds , the oxidation number of carbon is not zero ?

Answer»

`C_(12) H_(22)O_(11)`
`HCHO`
`CH_3CHO`
`CH_3COOH`

Answer :C
Discussion
27.

In which of the following compounds, the -OH group is least reactive

Answer»




Solution :In salicyladehyde, the `-OH` group is not so REACTIVE as that in the m and p-isomers or in benzyl ALCOHOL. Thisis due to intramolecular HYDROGEN BONDING (CHELATION)
Discussion
28.

In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?

Answer»

`""^(**)C H_3)-CH_(2)-Cl`
`""^(**)C H_(3)-CH_(2)-Mg^(+)Cl^(-)`
`""^(**)C H_(3)-CH_(2)-Br`
`""^(**)C H_(3)-CH_(2)-CH_(3)`

Solution :(A )Cl group attract the ELECTRONS of BOND toward it, due to its electron attracting inductive effect and MAKE theC of `CH_(3)` positive.

(B) In `""^(**)C H_(3)-CH_(2)-Mg^(+)Cl^(-)`, Mg is electropositive so, the repulsion of electron and positive charge of `""^(**)C" in " ""^(**)C H_(3)` is decreases

(C ) In `""^(**)C H_(3)-CH_(2)-Br` the STRENGTH of Br(-I) is less than Cl(-I) so, the carbon of `""^(**)C H_(3)CH_(2)Br` is become less positive

(D) Due to (+I) effect, the `-CH_(2)CH_(3)` group of `""^(**)C H_(3)-CH_(2)-CH_(3)` release the electron and increase the electron density of C in `""^(**)C H_(3)`

The electron density on carbon of `""^(**)C H_(3)` in `""^(**)C H_(3)-CH_(2)-Cl` is minimum and this carbon is MAXIMUM positive.
Discussion
29.

In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge ?

Answer»

`.^(**)CH_(3)-CH_(2)-CL`
`.^(**)CH_(3)-CH_(2)-Mg^(+)Cl^(-)`
`.^(**)CH_(3)-CH_(2)-Br`
`.^(**)CH_(3)-CH_(2)-CH_(3)`

Solution : hasgreatest positive CHARGE since `Cl` atom has maximum `- I` effect.
Discussion
30.

IN which of the following compounds, the C-Cl bond ionization shall give most stable carbonium ion ?

Answer»




SOLUTION :CARBOCATIONS have stability `3^(@) gt` BENZYL `gt 2^(@) - NO_(2)` is with drawing and DECREASES the stability of carbonium ion
Discussion
31.

In which of the following compounds, the C-Cl bond ionisation shall give most stable carbonium ion?

Answer»




SOLUTION :
Discussion
32.

In which of the following compounds the C-Cl bond ionisation shall give most stable carbonium ion ?

Answer»




Solution :More stable the carbocation, more facile is C-Cl bond ionization. Now the stability of carbocations decreases in order :
`(CH_(3))_(3)C^(+) gt C_(6)H_(5)CH_(2)^(+) gt (CH_(3))_(2)CH^(+) gt CH_(3)CH_(2)^(+)`
Thus, OPTION (d) is correct.
Discussion
33.

In which of the following compounds oxidation state of chlorine has two different values?

Answer»

`CaCl_(2)`
`NaCl`
`CaOCl_(2)`
`C Cl_(4)`

SOLUTION :`CaOCl_(2) rarr Ca^(2+)+Ocl^(-)+Cl^(-)`
In `Ocl^(-)1` ( hypochlorite ION oxidation state of Cl)
`=-2+X=-1rArr x= +1`
In `Cl^(-)` oxidation state of chlorine `=-1`
Discussion
34.

In which of the following compounds oxygen exhibits an oxidations state of +2?

Answer»

`H_(2)O`
`H_(2)O_(2)`
`OF_(2)`
`H_(2)SO_4`

SOLUTION : In `OF_2`MOLECULES l oxygen is less electro-negative atom tha. .F. atom .
Discussion
35.

In which of the following compounds nitrogen exhibits highest oxidation state?

Answer»

`N_(2)H_(4)`
`NH_(3)`
`N_(3)H`
`NH_(2)OH`

Solution :`overset(-2)N_(2)H_(4),overset(-3)NH_(3),overset(-1//3)N_(3)H,overset(-1)NH_(2)OH`
THUS, `N_(3)H` has the highest oxidation state of N.
Discussion
36.

In which of the following compounds, nitrogen cannot be tested by Lassaigne.s test?

Answer»

`C_6H_5NH_2`
`NH_2NH_2`
`CH_3CONH_2`
`C_6H_5NO_2`

ANSWER :B
Discussion
37.

In which of the following compounds, nitrogen exhibits highest oxidation state?

Answer»

`N_(2)H_(4)`
`NH_(3)`
`N_(3)H`
`NH_(2)OH`

Answer :C
Discussion
38.

In the which of the following compounds mesomerie effect is possible?Vinyl chloride , b) Allyl chloride and c) 3- Butenal

Answer»

Solution :(a) Vinyl chloride `CH_(2) = CH- underset(..)overset(..)(Cl):`
(b) Allyl chloride `CH_(2) = CH- CH_(2) - underset(..)overset(..)(Cl):`
(C ) 3-Butenal `CH_(2) = CH- CH_(2) - underset(underset(H)(|))(C )= O`
In vinyl chloride LONE pair and `pi` bond are in conjugation. Hence + M EFFECT is possible in iit. In allyl chloride, lone pair is not inconjugation with `pi` bond and in 3-butenal also conjugation is ABSENT. Thus in allyl chloride and 3-butenal, mesomeric effect is abscent.
Discussion
39.

In which of the following compounds interamolecular hydrogen bonding is possible: (i) CH_(3)COOH (ii) CH_(3)COOH =C(OH)CH_(3). (iii) CH_(3)CONH_(2), (iv) HOCH_(2)CH_(2)OH, (v) PbCOC(OH)_(2)COPh (vi) (CH_(3))_(2)NH

Answer»

SOLUTION :
Discussion
40.

In which of the following compounds, hybridisation of all C-atoms is not the same?

Answer»

Ethane
ETHENE
Ethyne
prop-1-ene

Solution :(A) Ethane `H_(3) UNDERSET(underset(SP^(3))(uarr))(C )-underset(underset(sp^(3))(uarr))(C )H_(3)` (B) Ethene `H_(2) underset(underset(sp^(2))(uarr))(C )= underset(underset(sp^(2))(uarr))(C )H_(2)` (C ) Ethyne `underset(sp)(HC) -= underset(sp)(C H)` (D) `underset(underset(sp^(3))(uarr))(CH)underset(underset(sp^(2))(uarr))(CH)=underset(underset(sp^(2))(uarr))(CH_(2))`
Discussion
41.

In which of the following compounds H - bonding is strogest in the liquid phase

Answer»

HF
`CH_4`
HI
`PH_3`

SOLUTION :Only HF has H- bonding (due to High EN and SMALL size of F).
Discussion
42.

In which of the following compounds does the central atom obey the octel rule ?

Answer»

`XeF_4`
`AlCl_3`
`SF_6`
`SCl_2`

Solution :`{:("COMPOUND","No. of valence electrons on the central atom"),(XeF_2, 10),(AlCl_3,6),(SF_6,12),(SCl_2,8):}`
Hence in (d) `SCl_2` OCTEL rule is followed.
Discussion
43.

In which of the following compounds does the central atom obey the octet rule ?

Answer»

`XeF_(4)`
`AlCl_(3)`
`SF_(6)`
`SCl_(2)`

Solution :
Discussion
44.

In which ofthe following compounds does not central atom obey the octet rule ?

Answer»

`XeF_(4)`
`XeOF_(2)`
`SCl_(2)`
`AlCl_(3)`

Solution : has complete octet around
central ATOM (S) while `XeF_(4) and XeOF_(2)` have
expended OCTETS and `AlCl_(3) and BF_(3)` have
incomplete octets.
Discussion
45.

In which of the following compounds does hydrogen has an oxidation state of -1?

Answer»

`CH_4`
`NH_3`
HCL
`CaH_2`

ANSWER :D
Discussion
46.

In which of the following compounds does carbon exhibit fractional oxidation state ?

Answer»

`C_(4) H_(4) O_(6)^(2-)`
`Na_(2)CO_(3)`
`C_(2)H_(5)OH`
`H_(2)C_(2)O_(4)`

Answer :A
Discussion
47.

In which of the following compounds delocalisation of electrons and shifting of electron in the same direction ?

Answer»


`CH_(3)-NH-NO_(2)`
`CH_(2)=CH-CH=CH-NO_(2)`
`H_(2)N-overset(H)overset(|)C=CH_(2)`

ANSWER :B::C
Discussion
48.

In which of the following compounds, carbon is in the lowest oxidation state ?

Answer»

`CH_(4)`
`CF_(4)`
`CO_(2)`
`C Cl_(4)`

ANSWER :A
Discussion
49.

In which of the following compounds carbon exhibits a velency of 4 but oxidation stae of -2?

Answer»

`CH_(3)CI`
`CHCI_(3)`
`CH_(2)CI_(2)`
HCHO

Solution :The VALENCY of c in al the four COMPOUNDS is 4 but O.N of C in `CH_(3)CI` is : `x+3xx1+1xx(-1)=0 or x=-2`
Discussion
50.

In which of the following compounds, an element exhibits two different oxidation states ?

Answer»

`NH_(4)OH`
`NH_(4)NO_(3)`
`N_(2)H_(4)`
`N_(3)H`

Solution :`NH_(4)NO_(3)toNH_(4)^(+)+NO_(3)^(-)`
OXIDATION NUMBER in `NH_(4)^(+)` is -3.
Oxidation number in `NO_(3)^(-)` is +5.
Discussion