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 Williamson synthesis if tertiary alkyl halide is used than

Answer»

ether is obtained in good yield
ether is obtained in good yield
alkene is the only reaction product
a mixture of alkene as a MAJOR product and ether as a minor product forms

Solution :lf a TERTIARY alkyl halide is used, an alkene is the only reaction product and no ether is formed. For example, the reaction of `CH_(3)Ona` with `(CH_(3))_(3)C-Br` gives exclusively 2-methylpropene.

It is because alkoxides are not only nucleophiles but strong BASES as well. They react with alkyl halides leading to ELIMINATION reactions.
Discussion
2.

In Williamson reaction intermediate formed is

Answer»

carbocation
free radical
carbanion
T.S

Answer :D
Discussion
3.

In Willamson's synthesis, ethoxyethane is prepared by

Answer»

Passing ETHANOL over ALUMINA
heating ethanol with dry `Ag_2O`
heating sodium ethoxide withethyl bromide
treating ETHYL alcohol with EXCESS of `H_2SO_4`

Solution :NA
Discussion
4.

In white phosphorus, the arrangement of P atoms is

Answer»

linear
tetrahedral
square planar
none of these

Answer :B
Discussion
5.

In white phosphorus, the incorrect statement is

Answer»

SIX P-P single bonds are present
FOUR P. P single bonds are present
 four LONE pairs of ELECTRONS are present
 PPP bond ANGLE is 60

Answer :B
Discussion
6.

In which type of molecule, the dipole moment will be nonzero :-

Answer»

`AB_(2)L_(2)`
`AB_(2)L_(3)`
`AB_(4)L_(2)`
`AB_(4)`

ANSWER :A
Discussion
7.

In which two compounds , homolytic cleavage of the C-H_a bond take place most readily -

Answer»

`CH_2=CH-UNDERSET(H_a)underset(|)C(CH_3)_2`
`CH_2=CH-underset(H_a)underset(|)CHCH_3`
`CH_3CH_2-H_a`
`CH_3-H_a`

ANSWER :A::B
Discussion
8.

In which transfer of five electrons takes place

Answer»

`Cr_(2)O_(7)^(2-) rarr 2 Cr^(3+)`
`CrO_(4)^(2-) rarr Cr^(3+)`
`MnO_(4)^(-) rarr MnO_(2)`
`MnO_(4)^(-) rarr MN^(2+)`

Answer :D
Discussion
9.

In which two metals in the following pairs the difference between the ionic radii is maximum?

Answer»

`K, Ca`
`Mn , Fe`
`CO, NI`
`Cr, Mn`

Answer :A
Discussion
10.

In which transition maximum amount of energy will be released.

Answer»

`S(g)+"le"^(-)RARRS^(-)(g)`
`O(g)+"le"rarrO(g)`
`N(g)rarrN^(+)(g)"+l"E^(-)`
`He(g)+"le"^(-)gtHe^(-)(g)`

SOLUTION :(I) as EA of `SgtEA` of O
Discussion
11.

In which there is outer orbital hyridisation

Answer»

`[ZN(NH_(3))_(4)]^(2+)`
`[Co(NH_(3))_(6)]^(3+)`
`[Cr(NH_(3))_(6)]^(3+)`
`[V(NH_(3))_(6)]^(3+)`

Solution :`V(Z=23):[AR]^(18)4s^(2)3d^(3)`
`V^(3+) : [Ar]^(18)3d^(2)`
`V^(3+)` undergoes `d^(2)SP^(3)` hybridisation, involving 3d, 4s and 4p-orbitals, to accommodate six lone pairs form six `NH_(3)` molecules. Thus , outer orbitalhybridisation is involved
Discussion
12.

In which the following molecules , the substituent does not exert its resonance effect?

Answer»

`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)NH_(3)`
`C_(6)H_(5)OH`
`C_(6)H_(5)CI`

Solution :In `C_(6)H_(5)NH_(3)` , there is no LONE pair of electrons on the N-atom and HENCE it cannot exert its resonance effect. Hence, (B) is the correct ANSWER.
Discussion
13.

In which there is outer orbital hybridisation:

Answer»

`[Zn(NH_3)_4]^(2+)`
`[CO(NH_3)_6]^(3+)`
`[Cr(NH_3)_6]^(3+)`
`[V(NH_3)_6]^(3+)`

ANSWER :D
Discussion
14.

In which the following cases , does the reaction go farthest to completion

Answer»

`K = 10^(3)`
`K = 10^(-2)`
`K = 10`
`K = 1`

Solution :HIGHER the value of rate constant so , faster the reaction rate .
Discussion
15.

In Which system ,zero order reaction almost occurs in?

Answer»

Hetro system
Close system
Homo system
Open system

Answer :A
Discussion
16.

In which substances does nitrogen exhibit the lowest oxidation state?

Answer»

nitrogen gas
ammonia
NITROUS OXIDE
nitric oxide

Solution :Nitrous oxide `(N_(2)O)`
`therefore N=+1`
Discussion
17.

In which substance does nitrogen exhibit the lowest oxidation state ?

Answer»

Nitrogen gas
Ammonia
NITROUS oxide
NITRIC oxide

Solution :Oxidation state of nitrogen gas `(N_(2))` is zero, as both the nitrogen atom possess same ELECTRONEGATIVITY as well as same number of electrons. The oxidation states of ammonia. Nitrous oxide and nitric oxide are given below Ammonia `(NH_(3))`
`x=3(1)=0`
`x=-3`
Nitrous oxide `(N_(2)O)`
`2(x)+1(-2)=0`
`2x=2`
`x=+1`
Nitric oxide (NO)
`x+(-2)=0`
`x=+2`
Thus, nitrogen exhibits LOWEST oxidation state in case of ammonia
Discussion
18.

In which state, the compounds of vandadium are diamagnetic ?

Answer»

V (II)
V (III)
V (IV)
V (V)

Solution :V(V) has `3D^(0)` configuration and has 2 UNPAIRED electrons.
Discussion
19.

In which species, X-O bond order is 1.5 and contains ppi-dpi bond(s)

Answer»

`IO_(2)F_(2)`
`HCOO^(-)`
`SO_(3)^(2-)`
`XeO_(2)F_(2)`

SOLUTION :
Discussion
20.

In which species the hybrid state of central atom is / are sp^(3) d ?

Answer»

`I_(3)^(-)`
`SF_(4)`
`PF_(5)`
`IF_(5)`

ANSWER :A::B::C
Discussion
21.

In which species the hybrid state of central atom is / are sp^(3)d?

Answer»

`I_(3)^(-)`
`SF_(4)`
`PF_(5)`
`IF_(5)`

Answer :A::B::C
Discussion
22.

In which solution halogen molecules tend to disproportionate ?

Answer»

In `H_2SO_4`
In cold `H_2O`
In HOT NaOH
In hot water

Solution :In hot basic medium `OC l^(-)` DISPROPORTIONATES
`3OCl^(-) to 2Cl^(-) + ClO_3^-`
Discussion
23.

In which solution halogen molecule tends todisproportionate ?

Answer»

In `H_2SO_4`
In cold `H_2O`
In HOT NaOH
In hot water

Solution :In hot basic MEDIUM `OC l^-` disproporationates
`30Cl^(-) to 2Cl^(-) + ClO_3^(-)`
Discussion
24.

Which of the following species is paramagnetic ?

Answer»

`B_(2), O_(2), N_(2)`
`B_(2), O_(2), N_(2)^(+)`
`B_(2), F_(2), O_(2)`
`B_(2), O_(2), Li_(2)`

Answer :B
Discussion
25.

In which SO_2 acts as oxidant, while reacting with ?

Answer»

ACIDIFIED `KMnO_4`
Acidified `K_2Cr_2O_7`
`H_2S`
Acidified `C_2H_5OH`

ANSWER :C
Discussion
26.

In which season the depletion of ozone on Antartica takes place and when it is replenished .

Answer»

SOLUTION :During spring season (i.e., in MONTHS of September & OCTOBER) , depletion of OZONE takes place and after spring (i.e., in month of November) it is replenished.
Discussion
27.

In which rexampleion /rexampleions of the atmosphere , temperature decreases with altitudes?

Answer»

Troposphere
Stratosphere
thermosphere
none of these

Answer :A
Discussion
28.

In which reactions, correct stereo chemistry of product is mentioned ?

Answer»




Solution :(A)trans+Anti addition `to` Meso COMPOUND , (B)Trans+SYN addition `to` Racemic mixture
(C )CIS + Anti addition `to` Racemic mixture , (D)Trans+SYN addition `to` Racemic mixture.
Discussion
29.

In which reaction racemic mixture is obtained as product ?

Answer»

`Ph-CHO+HCNto`
`H_(3)C-UNDERSET(C_(2)H_(5))(CH)-CH_(2)-OH+SOCl_(2)OVERSET("pyridine")(to)`
`H_(3)C-underset(CL)underset(|)(CH)-CH_(2)-CH_(3)+C_(3)H_(7)overset(ө)(O)overset(o+)(Na)underset(Delta)overset(ROH)(to)`
All of these

Answer :A
Discussion
30.

In which reaction triangleS is positvive:

Answer»

`H_2O(L)rarrH_2O(s)`
`3O_2(G)rarr2O_3(g)`
`H_2O(l)rarrH_2O(g)`
`N_2(g)+3H_2(g)rarr2NH_3(g)`

ANSWER :C
Discussion
31.

In which reaction there is no change in valency and the oxidation state ?

Answer»

`SO_2 + H_2S RARR 2H_2O + 3S`
`2NA + O rarr Na_2O`
`Na_2O_2 + H_2SO_4 rarr Na_2SO_4 + H_2O_2`
`4KClO_3 rarr 3KClO_4 + KCl`

ANSWER :C
Discussion
32.

In which reaction there will be increase in entropy

Answer»

`Na(s)+H_(2)O(l)rarrNaOH(l) + (1)/(2)H_(2)(G)`
`Ag^(+)(aq)+Cl^(-)(aq)rarrAgCl(s)`
`H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l)`
`Cu^(2+)(aq)+4NH_(3)(g) rarr[Cu(NH_(3))_(4)]^(2+)(aq)`

Solution :In reaction (a) Na (s) REACTS with `H_(2)O(l)` to give NaOH(l) and `(1)/(2)H_(2)(g)`. Since, the entropy of a gas is higher than that of liquid and the entropy of liquid is higher than that of solid, THEREFORE, the CHANGE in entropy of this reaction increases.
Discussion
33.

In which reaction the product is not correctly given ?

Answer»

`PhOCH_3+Br_(2)overset(FeBr_3)(RARR)(##NTA_NEET_SET_105_E02_036_O01.png" WIDTH="30%">
`PhCOOH+CH_3CH_2Cloverset(AlCl_3)(rarr)(##NTA_NEET_SET_105_E02_036_O02.png" width="30%">

Both A and B

Answer :D
Discussion
34.

In which reaction product is mentioned incorrectly ?

Answer»




ANSWER :A
Discussion
35.

In which reaction product is hydrocarbon ?

Answer»


`CH_(3)COO Ag overset(Br_2//C Cl_(4))to`
`Ph-COOH overset(NaOH)underset(CaO,Delta)to`
`CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-Cl overset(C_(2)H_(5)OH)to`

Answer :A::C
Discussion
36.

In which reaction , polysubstitution takes place :

Answer»




Solution :In Friedel Craft's Alkylation REACTION, monoalkyl derivative READILY undergoes further alkylation to PRODUCE polysubstituted derivatives. This is one of the DRAWBACKS of Friedel-Craft's reaction
Discussion
37.

In which reaction new C- C bond does not form

Answer»

Aldol
Cannizzaro's
Wurtz
HCN + RMGX

ANSWER :B
Discussion
38.

In which reaction is hydrogen acting as an oxidising agent ?

Answer»

With iodine to, give HYDROGEN iodide
With lithium to give lithiym HYDRIDE
With nitrogen to give ammonia
With SULPHUR to give hydrogen sulphide

Answer :B
Discussion
39.

In which reaction is a quaternary ammonium salt is not formed?

Answer»

Reaction of `EtNH_(2)` with EXCESS Mel.
Reaction of `EtNH_(2)` with EtCl.
Reaction of `EtNH_(2)` with n-BuBr
Reaction of `EtNH_(2)` with MeCOCI.

Solution :AMINES REACTS with excess of R-X
Discussion
40.

In which reaction hydrogen is not formed :

Answer»

COPPER andhydrochloric acid
Iron and sulpuric acid
Magnesium and steam
Sodium and alcohol

Answer :A
Discussion
41.

In which reaction H_2O_2 acts reducing agent?

Answer»

`Ag_2O +H_2O_2 rarr2Ag +H_2O +O_2`
`2KI +H_2O_2 RARR rarr2KOH +1_2`
`PBS +4H_2O_2 rarrPbSO_4+4H_2O`
`H_2O_ 2 +SO_2 rarrH_2SO_4`

ANSWER :A
Discussion
42.

In which reaction DeltaS is negative

Answer»

`H_(2)O(L) rarr H_(2)O(G)`
`H_(2)O(s)rarrH_(2)O(l)`
`H_(2)O(g) rarr H_(2)O(s)`
`H_(2)O(s) rarrH_(2)O(g)`

Answer :C
Discussion
43.

In which of the following reactions does SO_2 act as an oxidising agent?

Answer»

ACIDIFIED `KMnO_4`
Acidified `K_2Cr_2O_7`
Acidified `C_2H_5OH`
`H_2S`

ANSWER :D
Discussion
44.

In which reaction alkyl halides react with metallic sodium in the presence of anhydrous ether ?

Answer»


ANSWER :WURTZ's REACTION.
Discussion
45.

In which reaction addition takes place according to Markovnikov's rule:

Answer»

`CH_3CH = CH_2 + Br_2rarr`
`CH_3CH = CH_2 + HBR RARR`
`CH_2 = CH_2 + HBr rarr`
`CH_3CH = CHCH_3 + Br_2rarr`

ANSWER :B
Discussion
46.

In which reaction a chiral reactant is giving a chiral product.

Answer»




SOLUTION :
Discussion
47.

In which radioation mass number and atomic number will not change

Answer»

`ALPHA`
`beta`
`gamma`
`alpha and 2 beta`

ANSWER :C
Discussion
48.

In which product formation takes place according to Hofmann's rule

Answer»




SOLUTION :Bulky SUBSTRACTS, Bulky BASE and BAD leaving groups. Halfmann.s product is major
Discussion
49.

In which process sulphur is not used:

Answer»

PROTECTION of grape wines
Manufacture of `H_2SO_4`
Manufacture of BLACK shoe polish
Vulcanisation of rubber

Answer :C
Discussion
50.

In which process, a catalyst is not used :

Answer»

Deacon.s process
Solvay.s process
Chamber process
Haber.s process

Answer :B
Discussion