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.

Properties of elements X: (i) Its amide is used as a reducing agent (ii) Its amalgam is used as reducing agent Properties of element Y: (i) It is an octaatomic molecule (ii) It is diamagnetic in ground state but paramagnetic in vapour phase Properties of element Z: (i) Its diatomic molecule is paramagnetic (ii) Its allotrope is an absorber of UV radiation (iii) IT supports combustion Compound of X and Z + Compound of Y and Z rarr product(s). Oxidation number of Y in the final compound may be:

Answer»

`+4` or `+6`
0 and `+2`
`+3` and `+5`
`-2` and `+4`

Answer :A
Discussion
2.

Properties like variety of oxidation states, formation of coloured ions and complex compound formation are due to

Answer»

PARTLY FILLED s-orbitals.
partly filled p-orbitals.
partly filled d-orbitals.
completely filled d-orbitals.

ANSWER :C
Discussion
3.

Properties common to the elements manganese, iron, cobalt, nickel nad copper include the ready formation by them all of (I) coloured ions in aqueous solution (II)oxides of nitrogen are formed on reaction with concentrated HNO_(3) (III) chlorides of formula MCl_(2) and MCl_(3)

Answer»

I, II, III
I, II
II, III
I only

Answer :B
Discussion
4.

Properties of elements are periodic function of number of present in the nucleus

Answer»

Protons
Electrons
Neutrons
Mesons

Answer :A
Discussion
5.

Properties associated with teflon are

Answer»

It is chemically merit.
It is used in MAKING oil SEEDS.
It is used for non-stick surface COATED utensils
All the above.

Answer :D
Discussion
6.

Propene when heated with chlorine at about 500^@ C forms

Answer»

`CH_2Cl.CH=CH_2`
`CH_3.CHCl.CH_2Cl`
`CH_2Cl. CHCl. CH_2Cl`
All of three

Solution :`CH_3-CH=CH_2+Cl_2overset(500^@C)to undersetunderset(Cl)(|)CH_2-CH=CH_2+HCl`
This REACTION is called allylic HALOGENATION reaction because halogenation OCCURS at the allylic POSITION of an alkene
Discussion
7.

Propene,CH_3CH=CH_2 can be converted into 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion:

Answer»

`H_2O`
`B_2H_6,H_2O_2`
`H_2SO_4`
None

Answer :B
Discussion
8.

Write the relavant chemical equations : Propene to propyne

Answer»

Solution :`CH_(3)-CH=CH_(2) underset(C Cl_(4))overset(Br_(2))rarr CH_(3)-overset(overset(BR)(|))(CH)-overset(overset(Br)(|))(CH_(2)) underset(KOH)overset("Alc")rarr CH_(3)-C -= CH`
Discussion
9.

Write the relavant chemical equations : Propene to nitropropane

Answer»

Solution :`CH_(3)-CH= CH_(2) UNDERSET("peroxide")overset(HBr)rarr CH_(3)-CH_(2)-CH_(2)-BR overset(AgNO_(2))rarr CH_(3)-CH_(2)-CH_(2)-NO_(2)`
Discussion
10.

Propene to 1-bromopropane

Answer»

Solution :PROPENE to 1-bromopropane :
`underset("Propene")(CH_(3)-CH)=CH_(2)+HBroverset("PEROXIDE")rarrunderset("1-Bromopropane")(CH_(3)-CH_(2))-CH_(2)-Br`
Discussion
11.

Write the relavant chemical equations : Propene to 1-propanol

Answer»

Solution :`CH_(3)-CH=CH_(2) underset(2.H_(2)O_(2)//OH^(-))overset(1.BH_(3))RARR CH_(3)-CH_(2)-CH_(2)-OH`
Discussion
12.

Propene to 2-bromopropane

Answer»

SOLUTION :PROPENE to 2-bromopropane :
`UNDERSET("Propene")(CH_(3))-CH=CH_(2)+HBroverset("dark")rarrunderset("2-Bromopropane")(CH_(3)-overset("Br ")overset("|")(CH)-CH_(3))`
Discussion
13.

Propene on treatment with HI gives

Answer»

Only `CH_(3)CH_(2)CH_(2)I`
Only `CH_(3)CHICH_(3)`
`CH_(3)CH_(2)CH_(2) ("MINOR ") + CH_(3)CHICH_(3) `(MAJOR)
`CH_(3)CH_(2)CH_(2)I ("major") + CH_(3) CHI CH_(3)` (minor)

Answer :c
Discussion
14.

Propene reacts with HBr in the presence of a peroxide to form :

Answer»

n-propyl bromide
isopropyl bromide
1, 3-dibromopropane
propane

Solution :`CH_(3) - CH = CH_(2) UNDERSET("PEROXIDES")overset(HBR)rarr underset("n-Propyl bromide")(CH_(3)CH_(2)CH_(2)Br)`
Discussion
15.

Propene reacts with Cl_2 at 400-600^@Cto give:

Answer»

1,2 - dichloropropane
Allyl chloride
No REACTION
POLYVINYL chloride

Answer :B
Discussion
16.

Propene is treated with bromine in the presence of brine (aqueous NaC).Choose the correct statement regarding the above reaction.

Answer»

TOTAL TWO products are formed.<BR>Total THREE products are formed.
Total six products are formed.
Total eight products are formed.

Solution :`C-overset(H)overset(|)underset(Br)underset(|) C-C-Br, C-overset(Br)overset(|)underset(H)underset(|)C-Br,C-overset(H)overset(|)underset(Cl)underset(|)C-C-Br,`
`C-overset(Cl)overset(|)underset(H)underset(|)C-C-Br,C-overset(H)overset(|)underset(OH)underset(|)C-C-Br,C-overset(OH)overset(|)underset(H)underset(|)C-C-Br,`
Discussion
17.

Propene on hydroboraction-oxidation produces

Answer»

`CH_(3)CH_(2)CH_(2)OH`
`CH_(3)CHOHCH_(3)`
`CH_(3)CHOHCH_(2)OH`
`CH_(3)CH_(2)CHO`

Solution :`UNDERSET("Propene")(CH_(3)CH=CH_(2)) underset(("Hydroboration"))overset(B_(2)H_(6)//THF)to underset("Tri-n-propylborane")((CH_(3)CH_(2)CH_(2))_(3)B) underset(("Oxidation"))overset(H_(2)O_(2)//OH^(-))to underset("1-Propanol")(CH_(3)CH_(2)CH_(2)OH)`
Discussion
18.

Propene on hydration gives

Answer»

propan-1-ol
propan-2-ol
PROPANE
PROPYNE

ANSWER :B
Discussion
19.

Propene is not the product obtained by dehydration of :

Answer»

2-Propanol
1-propanol
Propanal
n-propyl alcohol

Answer :A
Discussion
20.

Propene is the product obtained by dehydration of

Answer»

2-propanol
1-propanol
Propanal
n-propyl alcohol

Answer :A
Discussion
21.

Propene is more reactive than ethene towards HBr because :

Answer»

propene can more readily undergo a FREE RADICAL chain reaction
propene gives rise to more stable carbonium ion
the double bond in CASE of propene is unstable
the methyl group attached to double bond WITHDRAWS the electrons and facilitates the attack.

ANSWER :B
Discussion
22.

Propene, CH_(3) - CH = CH_(2) can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion

Answer»

Alkaline `KMnO_(4)`
`B_(2)H_(6)` and alkaline `H_(2)O_(2)`
`O_(3) / /Zn` dust
`OsO_(4) // CH_(4) , Cl_(2)`

Solution :Hydroboration oxidation (INDUSTRIAL PREPARATION of alcohol)
`3CH_(3)CH=CH_(2)+(1)/(2)B_(2)H_(6)underset("ETHER")overset("dry")to (CH_(3)CH_(2)CH_(3))B`
`(CH_(3)CH_(2)CH_(3))B overset(H_(2)O_(2))to 3CH_(3)CH_(2)CH_(2)-OH`
Discussion
23.

Propene, CH_(3)-CH = CH_(2), can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion?

Answer»

ALKALINE `KMnO_4`
`B_2H_6` and alkaline `H_2O_2`
`O_3//Zn ` DUST
`OsO_4//CH_2Cl_2`

ANSWER :B
Discussion
24.

Propene can be converted into 2-propanol by hydration. Which of the following reagents is ideal to affect the conversion ?

Answer»

Alkaline `KMnO_4`
ZN DUST+ `H_2O`
conc. `H_2SO_4`
conc. HCI

ANSWER :C
Discussion
25.

Propanone reacts with iodine in acid solution as shown in this equation. CH_(3)C(O)CH_(3)+I_(2)overset(H^(+))rarrCH_(3)C(O)CH_(2)I+HI These data were obtained when the reaction was studied. |{:([CH_(3)C(O)CH_(3)]","M,[I_(2)]","M,[H^(+)]","M,"Relative Rate"),(0.010,0.010,0.010,1),(0.020,0.010,0.010,2),(0.020,0.020,0.010,2),(0.020,0.010,0.020,4):}| What is the rate equation for the reaction?

Answer»

RATE =`k[CH_(3)C(O)CH_(3)][I_(2)]`
Rate =`k[CH_(3)C(OH)CH_(3)]^(2)`
Rate = `k[CH_(3)C(O)CH_(3)]I_(2)][H^(+)]`
Rate = `k[CH_(3)C(O)CH_(3)]H^(+)]`

ANSWER :D
Discussion
26.

Propanone to propene

Answer»

SOLUTION :
Discussion
27.

Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will not produce.

Answer»

PRIMARY alcohol
Secondary alcohol
Tertiary alcohol
Carboxylic acid

Answer :A::B::D
Discussion
28.

Propanone is usually characterised by ________

Answer»

FEHLING's solution
iodoform test
Schiff's test
Tollen's reagent

Answer :B
Discussion
29.

Propanone is the product obtained by dehydrogenation of …………………. .

Answer»

Propan-2-ol
Propan-1-ol
Propanal
n-propyl alcohol

Solution :Propan-2-ol
Discussion
30.

Propanone is the product obtained by dehydrogenation of

Answer»

propanal
n-propyl alcohol
2-propanol
1-propanol

Solution :`underset("2-propanol")(CH_(3) - overset(overset(OH)(|))(CH) - CH_(3)) overset(-H_(2))rarr underset("PROPANONE")(CH_(3) - overset(overset(O)(||))(C )-CH_(3))`
`2^(@)` alcohols on dehydrogenation i.e., removal of `H_(2)` gives OXIDATION product-ketones.
Discussion
31.

Propanone does not undergo:

Answer»

OXIME FORMATION
Hydrazone formation with hydrazine
Cyanohydrin formation with HCN
Reduction of FEHLING's solution

Answer :D
Discussion
32.

Propanone can be prepared from ethyne by

Answer»

passing a mixture of ethyne and steam over a catalyst, magnesium at `420^(@)C`
passing a mixture of ethyne and ethanol over a catalyst zinc chromite
boiling ethyne with water and `H_(2)SO_(4)`
treating ethyne with lodine and NaOH.

Solution :`2CH-=CH+3H_(2)Ooverset(420^(@)C)underset("Mg or Zinc vanadate")to CH_(3)COCH_(3)+CO_(2)+2H_(2)`
Discussion
33.

Propanone can be obtained from oxidation of what ?

Answer»

propan -2-ol
propan - 1-ol
BUTAN - 2- ol
2-methylbutan - 1 -ol

SOLUTION :`CH_(3)CHOHCH_(3) overset("oxidation") to CH_(3)COCH_(3)+H_(2)O`
Discussion
34.

Propanol is heated with conc. H_(2)SO_(4) at 170^(@)C and the gas produced is reacted with HBr. What is the formula of the final product ?

Answer»

`CH_(3) - CH_(2) CH_(2)Br`
`CH_(3) underset(Br)underset(|)(CH)-underset(Br)underset(|)(CH_(2))`
`CH_(3) - underset(Br)underset(|)(CH) - CH_(2)OH`
`CH_(3) - underset(Br)underset(|)(CH) - CH_(3)`

SOLUTION :Dehydration of propanol with CONC. `H_(2)SO_(4)` gives propene which reacts with HBr to form
`CH_(3) underset(Br)underset(|)(CH) - CH_(3)` (Markovnikov.s rule).
Discussion
35.

Propanoic acid to acetic acid

Answer»

Solution :`CH_(3) COOH overset(NAOH)(to) CH_(3) CH_(2) COONa overset(NaOH)underset(CaO)(to) C_(2) H_(6) overset(Cl_(2)//h epsilon) (to) C_(2) H_(5) CL overset(AGOH) (to) C_(2) H_(5) OH overset((O))underset(KMnO_(4)//H^(+))(to) CH_(3) COOH`
Discussion
36.

Propanoic acid is the oxidative product of ,

Answer»

ethanol
3- pentanone
1- butanol
2- PROPANOL

Answer :B
Discussion
37.

Propanoic acid on warming withCl_2 in presence of red P gives :

Answer»

`CH_3CH_2Cl`
`CH_3CH_2Cl`
`CH_3CHClCOOH`
`CH_2ClCH_2COOH`

ANSWER :C
Discussion
38.

Propanoic acid is slightly weaker than acetic acid because

Answer»

methyl GROUP is ELECTRON with drawing
`+I ` EFFECT of `C_2H_5 ` is more than `-CH_3`
ACETIC acid is stronger than propanoic acid
propanoic acis has three carbon ATOMS

Answer :B
Discussion
39.

Propanenitrile is obtained by the action of alcholic KCN and what ?

Answer»

`CH_(3)CL`
`C_(2)H_(5)Cl`
`(CH_(3))_(2)CHCL`
`C_(2)H_(5)OH`

SOLUTION :`C_(2)H_(5)Cl+KCN overset(Delta) to C_(2)H_(5)CN+KCl`
Discussion
40.

Propanoic acd undergoes HVZ reaction to give chloropopanoic acid.The product obtained is

Answer»

as stronger as PROPANOIC acid
stronger acid than propanoic acid
stronger than dichloropropanoic acid
weaker acid than propanoic acid

Solution :`CH_(3)-CH_(2)-COOHtoCH_(3)-underset(Cl)underset(|)(CH)-COOH`
Stonger acid than propanoic acid because of the presence of electron WITHDRAWING -Cl group
Discussion
41.

Propane on dichlorinatin gives......isomers and out of them .....are optically active.

Answer»

`4,1`
`3,1`
`4,2`
`3,2`

SOLUTION :
Discussion
42.

Propanenitrilereactswith Ato giveB . ThecompoundB onadditionof HCNgives C .ThecompoundC onreductiongive 1-Amino-2- ethyl-4-methyl -2- pentanolwhich of thefollowis A gt

Answer»

`(CH_(3))_(3)CCH_(2) MgX`
`(CH_(3) )_(2) CHCH_(2) MgX`
`C_(2) H_(5) MgX`
`CH_(3) CH_(2) CH_(2) MgX`

SOLUTION :`CH_(3)CH_(2) CN + (CH_(3)) _(2) CHCH_(2)MgX to`
`(A)`
`CH_(3) CH_(2) C= Ooverset(HCN) (to)CH_(3) CH_(2) - overset(OH) overset(|)underset(CH_(2) CH (CH_(3))_(2))(C )- CH`
`overset("reduction") (to)CH_(3) CH_(2)- overset( OH) overset(|)underset( CH_(2)) CH(CH_(3))_(2) overset(|) (C ) - CH_(2) NH_(2)`
`1-` amino-2-ethyl -4-methyl-2-pentanol
Discussion
43.

Propane is treated with methyl magnesium bromide and them subjected to hydrolysis. Write the final product.

Answer»

SOLUTION :`UNDERSET("2-methylpropan-2-ol")((CH_3)_3-COH)`
Discussion
44.

Propane + Cl_(2)overset("UV light")toAoverset(Na//"ether")toB. The compound (B) is.

Answer»

n-hexane
2-methyl BUTANE
2,3-dimethyl butane
2,2-dimethyl propane

Answer :D
Discussion
45.

Propane-1-ol and Propane-2-ol are distinguish by which method ?

Answer»

Ozonolysis
Reduction
Dehydration
OXIDATION

Solution :Oxidation
Discussion
46.

Propane cannot be prepared from which reaction

Answer»

`CH_3-CH=CH_2underset(OH^-)OVERSET(B_2H_6)to `
`CH_3CH_2CH_2IundersetPoverset"HI"to`
`CH_3CH_2CH_2Cl overset"Na"to`
None of these

Solution :Hydroboration of alkenes FOLLOWED by hydrolysis in basic medium yield ALCOHOLS and not the alkanes .
`R-CH=CH_2overset(B_2H_6)to (R-CH_2-CH_2)_3 -B overset(OH^-)to R-CH_2-CH_2OH`
Discussion
47.

Propanal is____than propanone towards nucleophiles.

Answer»

SOLUTION :More REACTIVE
Discussion
48.

Propanal on treatment with dilute sodium hydroxide gives

Answer»

`CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CH(OH)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CH(OH)CH(CH_(3))CHO`
`CH_(3)CH_(2)COOH`

ANSWER :C
Discussion
49.

Propanal and propanone undergoes condensation reaction in presence of dil . KOH to form,

Answer»

`CH_(3)CH_(2)CH(OH)CH_(2)COCH_(3)`
`CH_(3)C(OH)(CH_(3))CH(CH_(3))CHO`
`CH_(3)CH(OH) (CH_(3))CH_(2)CH_(2)CHO`
NONE of these

Solution :Whenaldehydes condenses with ketone, gives four condensation products. It is the`alpha `- hydrogen ATOM of the ketone which isinvolved in thecondensation reaction and produces major product.
`CH_(3)CH_(2)CHO + HCH_(2)COCH_(3) overset("dil . NaOH") tounderset(" 4- HYDROXY 2- hexanone")( CH_(3)CH_(2)CH(OH) CH_(2)COCH_(3))`
Discussion
50.

Propan-2-ol to 2-methylpropan-2-ol.

Answer»

Solution :`underset("Propan-2-ol")(CH_(3)-OVERSET(OH)overset(|)(C)H-CH_(3)) underset("or "C_(5)H_(5)NH^(+)CrO_(3)Cl^(-))overset(Cu//573K)to underset("Propanone")(CH_(3)-overset(O)overset(||)(C)-CH_(3)) underset((ii)" "H_(3)O^(+))overset((i)" "CH_(3)MgBr)to underset("2-Methylpropan-2-ol")(CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3))`
Discussion