Explore topic-wise InterviewSolutions in Current Affairs.

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1.

C_8H_6O_2 on reaction with conc. NaOH undergoes a redox reaction to yield (A) which on treatment with KMnO_4//H^(o+) followed by NaOH / CaO gives an aromatic compound (X).Calculate the mol. Mass of aromatic compound (X).

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SOLUTION :
Discussion
2.

C_(8)H_(16) that can form cis-trans geometrical isomers and also has a chiral centre, is:

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both of these
NONE of these.

Answer :A
Discussion
3.

C_(8)H_(16) that can form cis-trans geometrical isomer and also has a chiral centre, is

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Both of these
None of these

Solution :Compound will not EXHIBIT cis-trans geometrical isomerism, as in it no similar GROUP as present on adjacent double bonded CARBON ATOMS.
Discussion
4.

C_(8)H_(12)O_(2)overset("LiAlH"_(4))underset(H_(2)O)to B("two mol per mol of A")overset("PCC")to ( C ) overset(CH_(3)"MgBr")underset(H_(3)O^(+))to (D) overset(H_(2)CrO_(4))underset("Acetone/water")to (A) Identify A to D.

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SOLUTION :
Discussion
5.

C_(8)H_(10)(A)overset(O_(3).H_(2)O)rarr Acid (B) Identify (A) and (B) in the above reaction

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SOLUTION :
Discussion
6.

C_(7)H_(8)O shows how many isomers?

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2
3
4
5

Solution :
Discussion
7.

C_(7)H_(9)N has how many isomeric forms that contain a benzene ring

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4
5
6
7

Solution :`C_(7)H_(9)N` has 5 ISOMERS
Discussion
8.

C_7H_7Cl has in all………isomers:

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2
5
3
4

Answer :D
Discussion
9.

C_7H_7Cl has in all…isomers

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3
2
4
5

Answer :C
Discussion
10.

C_(7)H_(10)O reacts with CH_(3)MgBr r to give a compound C_(8)H_(10)O which gives the test with iodoform, than fine out structure of A

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ANSWER :A
Discussion
11.

C_6HG_5NH_2 underset(273K, HCl) overset(HNO_2)(to)A underset(Cu_2(CN)_2)overset(KCN)(to)B overset(H_2O)(to)C Identify A, B and C.

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SOLUTION :
Discussion
12.

C_6H_6underset(H_2SO_4)overset(HNO_3)to X underset(FeCl_3)overset(Cl_2)to Y. In the above sequence Y is

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1-nitrochloro BENZENE
3-nitrochloro benzene
4-nitrochloro benzene
1,2-nitrochloro benzene

SOLUTION :
Discussion
13.

C_6H_6 underset( Alcl_3) overset( Co . HCl)to A overset( Conc. KOH) to B+C Correct statement among the following is

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First step is called Kolbe's REACTION
B and C are benzaldehyde and BENZYL alcohol.
SECOND step is called aldol condensation
A is benzene carbaldehyde

ANSWER :D
Discussion
14.

C_6H_6+CH_3Cl underset(AlCl_3)overset("anhydrous")to C_6H_5CH_3+HCl is an example of

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Friedel-Craft's REACTION
Kolbe's synthesis
Wurtz reaction
Gringnard reaction

Solution :`C_6H_6+CH_3Cl UNDERSET(AlCl_3)OVERSET"ANHYD."to C_6H_5CH_3 +HCL`, it is a Friedel-Craft reaction
Discussion
15.

C_(6)H_(6) +CO + HCl overset("Anhyd."AlCl_(3))rarr X + HCl Compound X is

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`C_6H_5CH_3`
` C_6H_5CH_2Cl`
` C_6H_5CHO`
`C_6H_5COOH`

ANSWER :C
Discussion
16.

C_(6)H_(6) + CH_(3)Cl underset(AlCl_(3))overset("Anhy.")rarr C_(6)H_(5)CH_(3) + HCl It is an example of

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FRIEDEL CRAFT's reaction
Wurtz reaction
Kolbe's reaction
Grignard reaction

Answer :A
Discussion
17.

C_(6)H_(6) + CH_(3) Cl underset(AlCl_(3))overset("Anhydrous")(rarr) C_(6)H_(5) - CH_(3) + HCl the name of the above reaction is

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FRIEDEL Craft
Reimer Tiemann
Swarts
Gattermann

Answer :A
Discussion
18.

C_6H_6+C_2H_5Cloverset(AlCl_3)rarrXoverset("Oxygen")rarrYoverset(H_2Cr_2O_7)rarr Z. Discuss and name the compounds X , Y and Z.

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Solution :Compound X is ethylbenene , `C_6H_5C_2H_5`. The REACTION is called Friedel - CRAFTS ethylation Y , is acetophenone, `C_6H_5COCH_3`. Oxidation of ethyl BENZENE at 400 K in the presence of manganeses acetate catalyst gives acetophenone Z . Is benzonic acid, `C_6H_5COOH`. Aromatic ketones give carboxylic acids in the presence of powerful OXIDANTS.
Discussion
19.

C_6H_6+ C_2H_5Cl overset(X)(to)YWrong statement among the following is

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'X' is LEWIS acid
In 'Y' all CARBONS are `sp^2`hybridised
For 'Y' four AROMATIC isomers are possible
Its homologue is toluene

Answer :B
Discussion
20.

C_(6)H_(6) + C_(2)H_(5)Cl overset(AlCl_(3))rarr X underset((CH_(3)COO)_(2)Mn)overset("Oxygen")rarr Y overset(H_(2)Cr_(2)O_(7))rarr Z Discuss the sequence and name the compounds X, Y and Z

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SOLUTION :Compound X is ethylbenzene, `C_(6)H_(5)C_(2)H_(5)`. The reaction is called Friedel-Crafts ethylation. Y is acetophenone, `C_(6)H_(5)COCH_(3)`. Oxidation of ethyl benzene at 400K in the presence of MANGANESE acetate CATALYST gives acetophenone. Z is BENZOIC acid, `C_(6)H_(5)COOH`. Aromatic ketones give carboxylic acids in the presence of powerful oxidants.
Discussion
21.

C_6H_6 + Br_2 overset(AlCl_3)(rarr) A overset("Mg. ether")(rarr) B overset(CO_2)(rarr)C overset(H_2O^(+))(rarr)C.Write the organic products A, B, C and D. Discuss these conversions.

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ANSWER :`D = C_6H_5COOH`
Discussion
22.

C_6H_6 + 3H_2overset(Ni//200^@C)rarr_____.

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ANSWER :`C_6H_12`
Discussion
23.

C_(6)H_(5)overset(O)overset(||)C CH_(3)+C_(6)H_(5)CHO overset(H^(+))rarr C_(6)H_(5)-overset(O)overset(||)C-CH_(2)overset(OH)overset("|")"CH"C_(6)H_(5) The above aldol condensation does not involve the formation of

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`C_(6)H_(5)-UNDERSET("+")overset(OH)overset("|")"C "-CH_(3)`
`C_(6)H_(5)-underset("+")overset(OH)overset("|")"C "-H`
`C_(6)H_(5)-overset(O)overset(||)C-overset(-)CH_(2)`
Both (a) and (b)

Answer :C
Discussion
24.

C_(6)H_(5)OH+Zn to C_(6)H_(6) + ZnO this reaction is used to identify the ______ present in natural products.

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methoxy GROUP
alkoxy group
double BOND
AROMATIC RING

ANSWER :D
Discussion
25.

C_6H_5OHwhen dissolved in water gives a solution with pH_____.

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>7
=7
<7
None of these

Answer :ESS than SEVEN:
Discussion
26.

C_(6)H_(5)OH-ClCOCH_(3)overset(aq. NaOH)to C_(6)H_(5)OCOCH_(3) is an example of

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DOW reaction
Reimer-Tiemann reaction
Schotten-Baumann reaction
Kolbe reaction

Answer :C
Discussion
27.

C_6H_5NO_2overset(Fe"/"HCl)(to)A underset(273K)overset(NaNO_2"/"HCl)(to)B underset(283K)overset(H_2O)(to)C 'C' is

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`C_6H_5-OH`
`C_6H_5-CH_2OH`
`C_6H_5-CHO`
`C_6H_5NH_2`

ANSWER :A
Discussion
28.

C_(6)H_(5)NO_(2) overset(Fe//HCl)(to)Aunderset(273K)overset(NaNO_(2)//HCl)(to)Bunderset(283K)overset(H_(2)O)(to)C. C is ……….

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`C_(6)H_(5)-OH`
`C_(6)H_(5)-CH_(2)OH`
`C_(6)H_(5)-CHO`
`C_(6)H_(5)NH_(2)`

SOLUTION :`C_(6)H_(5)NO_(2)overset(Fe//HCl)(to)C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)(to)C_(6)H_(5)-N_(2)Cloverset(H_(2)O)(to)C_(6)H_(5)-OH+N_(2)+HCl`
Discussion
29.

C_6H_5NO_2 overset(Fe"/"HCl)(to)A underset(273 K)overset(NaNO_2"/"HCl)(to)B underset(283 K) overset(H_2O)(to)C 'C' is

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`C_6H_5 - OH`
`C_6H_5- CH_2OH`
`C_6H_5 - CHO`
`C_6H_5NH_2`

ANSWER :A
Discussion
30.

C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)rarrXoverset(Cu_(2)(CN)_(2))rarrYoverset(H_(2)O//H^(+))rarrZ Z is identified as

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`C_(6)H_(5)-NH-CH_(3)`
`C_(6)H_(5)-COOH`
`C_(6)H_(5)-CH_(2)-NH_(2)`
`C_(6)H_(5)-CH_(2)-COOH`

Solution :`C_(6)H_(5)NH_(2)overset(NaNO_(2)//HCl)rarrC_(6)H_(5)N_(2)Cl`
`overset(Cu_(2)(CN)_(2))rarrC_(6)H_(5)CNoverset(H_(@)O //H^(+))rarrunderset("Benzoic acid")(C_(6)H_(5)-COOH)`
THUS product Z is identified as `C_(6)H_(5)-COOH`
Discussion
31.

C_(6)H_(5)NH_(2) underset(H^(+))overset(Na_(2)Cr_(2)O_(7))rarr?

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`C_(6)H_(5)CHO`


None

Solution :
Discussion
32.

C_(6)H_(5)NH_(2)+A overset("(i)Ether")toC_(6)H_(5)NHCOCH=CHCOOH. The compound A in the above reaction is

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SOLUTION :
Discussion
33.

C_6H_5N_2Cl+X +H_2O to C_6H_6+N_2+Y +HCl . Here X and Y are respectively.

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`H_3PO_3,H_3PO_4`
` H_3PO_2,H_3PO_3`
` H_3PO_2,H_3PO_4`
`H_3PO_3, H_3PO_2`

ANSWER :B
Discussion
34.

C_(6)H_(5)N_(2)Cl underset(KCN)overset(CuCN)rarr A underset(H^(+))overset(H_(2)O)rarr B underset(Delta)overset(NH_(3))rarr C underset(NaOH)overset(Br_(2))rarr D. Identify the final product, D.

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Solution :`C_(6)H_(5)N=NCl overset(CUCN)underset(KCN)RARR underset("(A)")(C_(6)H_(5)CN)overset(H_(2)O)underset(H^(+))rarr underset("(B)")(C_(6)H_(5)COOH) overset(NH_(3), Delta)rarr underset("(C )")(C_(6)H_(5)CONH_(2))`
Benzamide (C ) undergoes hypobromite reaction with bromine and alkalie. Degradation of benzamide gives aniline. The final product (D) in the given sequence is aniline, `C_(6)H_(5)NH_(2)`.
Discussion
35.

C_6H_5N_2Cl+C_6H_5OH overset( OH^(-))to XCorrect statement among the following

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X' is an yellow DYE
The reaction is electrophilic substitution in ` C_6H_5N_2Cl`
The reaction is electrophilic substution is phenol
The reaction is nucleophilic substitution in phenol

ANSWER :C
Discussion
36.

C_(6)H_(5)N_(2)^(+)Cl^(-) overset(x,y)to C_(6)H_(5)Cl + N_(2) X and y in the above reaction are

Answer»

`CuCl_(2), HCl`
CuCl, HCl
`ZnCl_(2), HCl`
`AlCl_(3), HCl`

Solution :`underset("chloride")underset("Benzene diazonium")(C_(6)H_(5)-N^(+)-=NCl^(-))overset(CuCl//HCl)rarrunderset("Chlorobenzene")(C_(6)H_(5)-Cl+N_(2))`
This REACTION is CALLED SANDMEYER reaction.
Discussion
37.

C_(6)H_(5)MgBr+O_(2)overset("heat")to X, X is

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`C_(6)H_(6)`
`C_(6)H_(5)OC_(6)H_(5)`
`C_(6)H_(5)OMgBr`
`C_(6)H_(5)CHO`

ANSWER :C
Discussion
38.

C_(6)H_(5)COOH on heating with Na_(2)CO_(3) releases

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`CO_(2) `
`""^(14)CO_(2)`
CO
NONE of these

ANSWER :A
Discussion
39.

C_(6)H_(5)COOH overset("1. "NH_(3))underset("2. "Delta)rarr Poverset(NaOBr)rarr Q overset("(1) Conc. "H_(2)SO_(4))underset("(2) "Delta, 460K)rarr R 'R' is :

Answer»

o - bromosulphanilic acid
sulphanilamide
sulphanilic acid
p - bromosulphanilamide.

Solution :`C_(6)H_(5)COOH overset("1. "NH_(3))underset("2. "DELTA)rarr underset("(P)")(C_(6)H_(5)CONH_(2))overset(NaOBr)rarr underset((Q))(C_(6)H_(5)NH_(2))overset("conc. "H_(2)SO_(4))underset(Delta. 460K)rarr`
Discussion
40.

C_(6)H_5F^(18) is a F^(18) radio - isotope labelled organic compound. F^(18) decays by positron emission. The product resulting on decay is

Answer»

`C_(6)H_(5)O^(18)`
`C_(6)H_5Ar^(19)`
`B^(12)C_(5)H_(5)F`
`C_(6)H_(5)O_(16)`

Solution :POSITRON emission :
`""_(9)F^(18) to ""_(8)E^(18) + ""_(1)e^(0)`
ATOMIC number 8 is for oxygen.
THUS, `""_(8)E^(18)` is `""_(8)O^(18), C_(6)H_(5)O^(18)` will be the PRODUCT after positron emission.
Discussion
41.

C_(6)H_(5)CONHCH_(3) can be converted into C_(6)H_(5)CH_(2)NHCH_(3)by

Answer»

`NaBH_(4)`
`H_(2)-Pd//C`
`LiAlH_(4)`
`Zn-Hg//HCl`

Solution :`C_(6)H_(5)CONHCH_(3) underset(HCl)overset(Zn-Hgl)toC_(6)H_(5)CH_(2)NHCH_(3)`.
This reaction is KNOWN as Clemmensen's reduction.
Discussion
42.

C_(6)H_(5)CONHCH_(3) can be converted into C_(6)H_(5)CH_(2)NHCH_(3) by

Answer»

`NaBH_(4)`
`H_(2)-Pd//C`
`LIAlH_(4)`
`Zn-Hg//HCl`

ANSWER :C
Discussion
43.

C_6H_5CONH_2 overset(dil.NaOH)(rarr)Aunderset(CaO)overset(NaOH)(rarr)B underset(AlCl_3)overset(CH_3Cl)(rarr)C. Name the reaction in the formation of C from B.

Answer»


ANSWER :Friedel-Craft's ALKYLATION
Discussion
44.

C_6H_5CONH_2 underset(KOH)overset(Br_2)(to)X underset(HCl)overset(HNO_2)(to)Y underset(Cu^+)overset(NaNO_2)(to)Z Identify X,Y and Z.

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SOLUTION :`X=C_6H_5NH_2,Y=C_6H_5N_2Cl, Z=C_6H_5NO_2`.
Discussion
45.

C_(6)H_(5)COC_(6)H_(5) is:

Answer»

Benzophenone
Acetophenone
Cinnamaldehyde
None of these.

Answer :A
Discussion
46.

C_(6)H_(5)Cl overset(NaOH(aq))underset(625K//300 atm)rarr overset(?)(……………….) The product can be

Answer»

BENZAL
SODIUM benzoate
Benzol
Sodium phenate

Solution :
Discussion
47.

C_(6)H_(5)Cl underset("625 K 300 atm")overset(NaOH(aq.))(rarr)... The product can be:

Answer»

Benzal
SODIUM benzote
Benzol
Sodium phenate

Solution :`PHCL underset("High temp. and pressure")OVERSET(NAOH)(rarr) underset("Sodium phenate")(PhONa`
Discussion
48.

C_6H_5CHO on reaction with Cl_2 gives:

Answer»

`C_6H_5CHCl_2`
`C_6H_5COOH`
`C_6H_5CH_2OH`
`C_6H_5COCl`

ANSWER :D
Discussion
49.

C_6H_5CHO+" Methylamine " to X Y+H_2SO_4 to p - " amino benzene sulphonic acid ". Then X and Y are

Answer»

SCHIFF's BASE, `C_6H_5NH_2`
`C_6H_6,C_6H_5CHO`
BENZAL -N-methyl AMINE, Toluene

Answer :A
Discussion
50.

C_6H_5CHO + HCN rarr C_6H_5CH(CN)OH, The product is

Answer»

OPTICALLY active
A MESO compound
Racemate
Mixture of diastereoisomers

Answer :C
Discussion