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.

How many chiral stereoisomers are possible for 2-bromo-3-chlorobutane?

Answer»


Solution :`CH_(3)-underset(Br)underset(|)OVERSET(**)(C)H-underset(Cl)underset(|)overset(**)(C)H-CH_(3)` since the compound has two different CHIRAL carbons, THEREFORE, `2^(2)=4` optical isomers are possible.
Discussion
2.

How many chiral stereoisomers can be drawn for 2 - bromo - 3 - chlorobutane ?

Answer»

2<BR>3
4
5

Solution :2-bromo-3-chloro-butane has 2 CHIRAL carbon atoms, hence has `2^(2) = 4` OPTICAL ISOMERS.
`{:(""Br" "Cl),("|""|"),(CH_(3)-C-C-CH_(3)),("|""|"),(""H""H):}`
Discussion
3.

How many chiral compounds are possible on monochlorination of 2-methylbutane?

Answer»

2
4
6
8

Solution :2-Methylbutane on monochlorinationn gives four isomers of which I and III are CHIRAL compounds.
`UNDERSET(I)(ClCH_(2)-OVERSET(CH_(3))overset(|)(.^(**)C)H-CH_(2)CH_(3))""underset(II)(CH_(3)-underset(Cl)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)CH_(3))`
`underset(III)(CH_(3)-overset(CH_(3))overset(|)(C)H-underset(Cl)underset(|)overset(**)(C)H-CH_(3))""underset(IV)(CH_(3)-overset(CH_(3))overset(|)(C)H-CH_(2)-CH_(2)Cl)`
Discussion
4.

How many chiral compounds are possible on monochlorination of 2-methyl butane

Answer»

8
2
6
4

Solution :`UNDERSET"(R+S)"(oversetoverset(Cl)(|)CH_2-undersetunderset(CH_3)(|)overset**CH-CH_2-CH_3), underset"(R+S)"(CH_3-undersetunderset(CH_3)(|)CH-underset**oversetoverset(Cl)(|)CH-CH_3)`
Four monochloro derivatives are CHIRAL
Discussion
5.

How many chiral compound are possible on mono chlorination of 2-methyl butane

Answer»

2
4
6
8

Solution :On CHLORINATION of 2-methyl BUTANE

Four CHIRAL compound are FORMED
Discussion
6.

How many chiral compounds are possible on monochlorination of 2-methyl butane ?

Answer»

2
4
6
8

Answer :A
Discussion
7.

How many chiral carbon atoms does Tetrachycline A (a broad spectrum antibiotic) have ?

Answer»


ANSWER :C
Discussion
8.

How many chiral carbon atoms are there in 1-chloro-2,5 dimethyl cyclohexane ?

Answer»

1
0
2
3

Solution :
Discussion
9.

How many chiral carbon atoms are present in 2.3,4- trichloropentane?

Answer»

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

Solution :
`C-2` and `C-4` are asymmetric `C` ATOMS, but `C-3` is not because two groups on `C-3` markeed are same.
Discussion
10.

How many chiral carbon atoms are presetn in 2,3,4-trichloropentane?

Answer»

1
2
3
4

Answer :B
Discussion
11.

How many chiral carbon atoms are present in ribulose?

Answer»

2
3
4
5

Answer :A
Discussion
12.

How many chiral carbon atoms are present in 2,3,4-trichloropentane?

Answer»

4
1
2
3

Solution :
Number of CHIRAL carbon ATOMS = two
Chiral carbon atoms or asymmetric carbon atom `RIGHTARROW` carbon atom bonded to FOUR different atoms or group of atoms in the molecule is called chiral carbon/stereocentre/asymmetric carbon atom.
Discussion
13.

How many chiral carbon atoms are present in 2, 3, 4- trichloropentane ?

Answer»

three
two
one
four

Answer :B
Discussion
14.

How many chain isomers are possible for the alkane C_(6)H_(14)?

Answer»

six
five
four
nine

Answer :B
Discussion
15.

How many carboxylic acids are possible for molecular formula C_(5)H_(10)O_(2) ?

Answer»

3
4
5
6

Answer :B
Discussion
16.

How many carboxylic acids are possible for C_(4)H_(8)O_(2) ?

Answer»

2
3
4
5

Answer :A
Discussion
17.

How many c.c. of oxygen will be liberated by 2 ampere current flowing for 3 minutes and 13 seconds through acidulated water ?

Answer»

11.2 c.c.
33.6 c.c.
44.8 c.c.
22.4 c.c.

Solution :`W_(O_(2)) = (E xxi xx t)/(F) = (8 xx 2 xx 193)/(96500) = 0.032` G
`(W)/(M) = (V)/(22400) THEREFORE V = (0.032 xx 22400)/(32) = 22.4` c.c.
Discussion
18.

How many cations are placed in 6^(th) group?

Answer»


ANSWER :1
Discussion
19.

How many carbonyl compounds (excluding stereoisomers) of molecular formula C_(6)H_(12)O can give yellow ppt. with NaOH//I_(2).

Answer»


SOLUTION :
Discussion
20.

How many carbons in triaheptacontane?

Answer»

73
37
703
370

Answer :A
Discussion
21.

How many carboncations are more stable than benzycarbocation Ph-Coverset(o+)(H)_2 ?

Answer»


SOLUTION :`1^(st),3^(RD),5^(th),6^(th),8^(th),9^(th)`
Discussion
22.

How many Carbon, Hydrogen and Chlorine atoms are present in DDT ?

Answer»

C = 13, H = 8, Cl = 3
C = 14, H = 9, Cl = 5
C = 14, H = 8, Cl = 5
C = 13, H = 9, Cl = 3

Solution :Structural formula of DDT
Discussion
23.

How many carbon atoms are present in one unit cell of diamond ?

Answer»

Solution :The coordination NUMBER of carbon in diamond is 4. It has fee STRUCTURE similar to that of ZINC sulphide.Unit cell of ZnS has 4 zinc cations and 4 sulphide anions. In diamond all lattice points are occupied by carbon atoms. Hence, number of carbon atoms in unit cell of diamond = 8AND `Z = XYZ_(3)`
Discussion
24.

How many C-C sigma (sigma) bonds are present in the given compound ?

Answer»


ANSWER :10
Discussion
25.

How many bridging oxygen atoms are present in P_(4)O_(10)?

Answer»

6
4
2
5

Answer :1
Discussion
26.

How many beta-ketoacids on heating undergodecarboxylation to give 2-methylcyclohexanone?

Answer»


SOLUTION :TWO. `BETA-`KETOACIDS, i.e.,
Discussion
27.

How many beta-elimination products are possible for 2-bromobutane?

Answer»

1
2
3
4

Answer :C
Discussion
28.

How many atoms of hydrogen are liberated at cathode , when 965 coulombs of charge is passed through water ?

Answer»

`6.02 xx 10^(21)`
`6.02 xx 10^(23)`
`6.02 xx 10^(-19)`
`6.02 xx 10^(19)`

Solution :`H_(2)O to H_(2) + (1)/(2) O_(2) or 2 H^(+) + 2E^(-) to 2H` i.e., 96500 C produce 1 MOLE H-ATOMS = `6.02 xx 10^(23)` atoms . So 965 C will produce H-atoms = `6.02 xx 10^(21)`.
Discussion
29.

How many atoms of fluorine are there in 1.9 xx 10 ^(-6)gram of fluorine (F=19 amu)

Answer»


ANSWER :`6..022 XX 10^16`
Discussion
30.

How many atoms of calcium will be deposited from a solution of CaCl_(2) by a current of 25 mA flowing for 60 sec?

Answer»

`4.68xx10^(18)` atoms
`4.68 XX 10^(15) ` atoms
`4.68 xx 10^(12)` atoms
`4.68xx10^(9)` atoms

Answer :A
Discussion
31.

How many atoms do a mercury vapour molecule consist of, if the vapour density of mercury vapour relative to air is 6.92? (Atomic mass of mercury is 200). The average molar mass of air is 29g/mol.

Answer»


Solution :`("VAPOUR DENSITY of Hg vapour")/("Vapour density of air")=("MOLAR mass of Hg")/("Molar mass of Air")`
`(6.92)/(1)=(m)/(29)` or m=200g/mol.
Discussion
32.

How manyatoms are there in pyaranose ring ?

Answer»

3
5
6
7

Answer :C
Discussion
33.

How many atoms are there in pyranose ring:

Answer»

5
3
6
7

Answer :C
Discussion
34.

How many atoms are there in a unit cell of Mg which forms hexagonal crystals, there being a face-centred atom in each end of the unit cell and 3 completely enclosed atoms within the unit cell-

Answer»

4
6
12
8

Answer :B
Discussion
35.

How many atoms are there in a cube based unit cell having one atom on each comer and two atoms on each body diagonal ?

Answer»

8
6
4
9

Answer :D
Discussion
36.

How many atoms are there in 5 moles of silver (N_(A)=6xx10^(23))

Answer»


ANSWER :`(##ALN_NC_CHM_MC_E01_011_A01##)`
`3XX 10^(24)`
Discussion
37.

How many atoms are covalently bonded to the chromium atom in Cr(NH_(3))_(4)Cl_(3) ?

Answer»

3
4
6
7

Solution :`[CR(NH_(3))_(4)Cl_(2)]CL`
Discussion
38.

How many atoms and molecules of phosphorus are present in 124 g of phosphorus (P_(4))?

Answer»

SOLUTION :`24.088xx10^(23)` ATOMS and `6.022xx10^(23)` MOLECULES
Discussion
39.

How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S_(8))?

Answer»

SOLUTION :Molecular formula of sulphur = `S_(8)`
`therefore"Molecular mass of sulphur "(S_(8))=32xx8=256.0u`
1 MOLE of sulphur molecules = 256 g = `6.022xx10^(23)` molecules of sulphur
Now, 256 g of sulphur contain `6.022xx10^(23)" molecules"`
`therefore"64 g of sulphur will contain"=(6.022xx10^(23)xx64)/(256)=1.506xx10^(23)" molecules."`
1 molecule of sulphur `(S_(8))` contains 8 ATOMS of sulphur
`therefore 1.506xx10^(23)` molecule of sulphur will contain sulphur atoms = `8xx1.506xx10^(23)=1.2048xx10^(24)` atoms.
Discussion
40.

How many asymmetric carbon atomsa re created during the complete reduction of benzil (PhCOCOPh) with LiAIH_(4)? Also write the number of possible steroisomers in the product.

Answer»

Solution :`PH-underset(O)underset(||)(O)-underset(O)underset(||)(O)-Phoverset(LiAIH_(4))rarrPh-underset(OH)underset(|)overset(H)overset(|*)(C)-underset(OH)underset(|)overset(H)overset(|*)(C)-Ph`
Thus, TWO symmetric CARBON atoms are CREATED in the reduction product. there are THREE stereoisoemers of the reduction production.
Discussion
41.

How many asymmetric carbon atoms are present in (i) 1, 2-dimethylcyclohexane (ii) 3-methycyclopentene and (iii) 3-methylcyclohexene

Answer»

TWO, ONE , one
one, one, one
Two, NONE, two
two, none, one

Solution :two, one, one
Discussion
42.

How manyasymmetriccarbon atoms are present in fructose ?

Answer»

4
3
2
6

Answer :B
Discussion
43.

How many asymmetric carbon atoms are present in 1, 2- dichlorocyclobutane?

Answer»

ONE
TWO
Three
Four

Answer :B
Discussion
44.

How many assymmetric carbon atoms are present in (i)1,2-Dimethyl cyclohexane , (ii)3-Methyl cyclopentane , (iii)3-Methylcyclohexane

Answer»

2,1,1
1,1,1
2,0,2
2,0,1

Solution :
Discussion
45.

How manyasymmetriccarbon atoms are in glucose ?

Answer»

4
3
2
1

Answer :A
Discussion
46.

How many aromatic (six membered carbocyclic) isomers possible for MFC_(7)H_(9)N.

Answer»


SOLUTION :
Discussion
47.

How many are the following compounds prepared by hydrationof alkenes: 1. Ethyl alcohol 2. Isopropyl alcohol 3. Tert-butyl alcohol?

Answer»

Solution :1. When ethen is passed through cold 98% `H_(2)SO_(4)`, ethyl hydrogen sulphate is formed, which on heating with water gives ethanol.
`underset("ethene")(CH_(2))=CH_(2) + underset(98%)(HOSO_(3)H)to underset("ethyl hydrogen sulphate")(CH_(3)-CH_(2)-OSO_(3)H)`
`CH_(3)-CH_(2)-OSO_(3)H+H_(2)O overset("boil")(to) underset("Ethanol")(CH_(3)-CH_(2)-OH+HOSO_(3)H)`
2. Propene wiht cold 80% `H_(2)SO_(4)` gives isopropyl hydrogen sulphate which further on bioling with water gives isopropyl alcohol.
`underset("Propene")(CH_(3)-CH=CH_(2) underset("cold 80% cone")(HOSO_(3)H) toCH_(3) -underset ("isopropyl hydrogen sulphate")underset(OSO_(3)H) underset(|) (CH_(3)-CH-CH_(3))`
`CH_(3) underset(OSO_(3)H)underset(|)(CH)-CH_(3)+H_(2)Ooverset("boil")(to)CH_(3) underset("isopropyl alcohol")underset(|)(CH)-CH_(3)`
3. 2-Methylpropene (isobutylene) directly reacts with `50% H_(2)SO_(4)` giving tert-tutyl hydrogen suphate, which when heated with water gives tert- butyl alcohol,
`CH_(3)-underset(("isobutylene"))underset(2-"methylpropene")underset(CH_(3)) underset(|) overset(CH_(2)) overset(||)(C)+HO-underset((50%))(SO_(3)H)tounderset("tert-butyl hydrogen sulphate") underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-O-SO_(3)H`
`CH_(3) -underset(CH_(3))underset(|)overset(CH_(3)) overset(|)(C)-O-SO_(3)H+H_(2)Ooverset("heat")(to) CH_(3) underset("tert-butyl alcohol") underset(CH_(3)) underset(|)overset(CH_(3)) overset(|)(C)-OH+H_(2)SO_(4)`
Discussion
48.

How many are redox reaction- {:((i),K_(4)[Fe (CN)_(6)] + "conc."H_(2)SO_(4) overset(Delta)rarr,(ii),"conc." H_(2)SO_(4) + KCl rarr),((iii),"conc." H_(2)SO_(4) + KBr rarr,(iv),"conc." H_(2)SO_(4) + NH_(3) rarr),((v),"conc." H_(2)SO_(4) + KNO_(3) rarr,(vi),"conc." H_(2)SO_(4) + PCl_(5) rarr),((vii),"conc." H_(2)SO_(4) + COCl_(2) rarr,(viii),"conc." H_(2)SO_(4) + Zn rarr),((ix),"conc." H_(2)SO_(4) + Cu rarr,,):}

Answer»


ANSWER :3(III, VIII, IX)
Discussion
49.

How many anions evolve brownish gas when treated with dil. /con. HCl ? (i) CO_(3)^(2-) "" (ii)SO_(3)^(2-) "" (iii) NO_(2)^(-) "" (iv)Cl^(-) (v) Br^(-) "" (vi) NO_(3)^(-) "" (vii) CH_(3)CO O^(-)

Answer»


ANSWER :1 (only III)
Discussion
50.

How many among the following imparts colour to theBunsen flame, when flame test is carried out? Ba, Mg, Ca, Be, Na, Sr,L

Answer»

5
6
7
4

Answer :A
Discussion