Explore topic-wise InterviewSolutions in Current Affairs.

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1.

R - X + Mg overset("ether". Delta)(to) overset(delta-)( R) - overset(delta+)(Mg) XGrignand reagent may be prepared from 1^@, 2^@ and3^@halides as well as from Vinyl and Aryl halide, vicinal dihalides are those halides which contain acidic tail do not form Grignand reagent.Which of the following compounds can form Grignand reagent on reaction with mg/ether

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SOLUTION :
Discussion
2.

R-X+Naloverset("dry")underset("Acetone")toR-1+NaX what is the name of reaction ?

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SOLUTION :Finkelstein.s REACTION
Discussion
3.

R-X+Mgoverset(Ether,Delta)rarroverset(delta-)R-overset(delta+)Mg-X Grignard reagents may be prepared from 1^(@) , 2^(@)" and "3^(@) halides as well as from vinayl and aryl halide. Vicinal dihalide and those halide which contain acidic tail do not form Grignard reagent. Which of the following halides is most reactive for the preparation of Grignard reagent?

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SOLUTION :N//A
Discussion
4.

R-X + NaI overset("Dry Acetone")toRI + NaX. This reaction is known as…………………

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SOLUTION :FINKELSTEIN REACTION
Discussion
5.

R - X + Mg overset("ether". Delta)(to) overset(delta-)( R) - overset(delta+)(Mg) XGrignand reagent may be prepared from 1^@, 2^@ and3^@halides as well as from Vinyl and Aryl halide, vicinal dihalides are those halides which contain acidic tail do not form Grignand reagent.Which of the following halide is most reactive for preparation of Grignand reagent

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SOLUTION :
Discussion
6.

R-underset(N-OH)underset("||")C-R'overset(PCl_(5))rarrR'-overset(O)overset("||")C-NH-R Which of the following statements are correct for above reaction ?

Answer»

Reaction is intermolecular
Reaction is ACID catalysed
It is the trans HYDROCARBON RADICAL with respect to the `-OH` group that migrates.
The REARRANGEMENT is intramolecular

Answer :B::C::D
Discussion
7.

R-overset(O)overset(||)C-NH_(2)+xNaOH+Br_(2)rarrR-NH_(2)+2NaBr+Na_(2)CO_(3)+H_(2)O Number of moles of NaOH used in above Hoffmann bromamide reaction is :

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3
4
5
6

Solution :(b) Balanced reaction is `R-OVERSET(O)overset(||)C-NH_(2)+4NaOH+Br_(2)rarrR-NH_(2)+2NaBr+Na_(2)CO_(3)+H_(2)O`
Discussion
8.

R - oversetunderset(||)(O)(C ) - Cl + Z to R - oversetunderset(||)(O)(C ) - RThe reagent Z is

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`R_2CuLi`
`R_2Cd`
`(ph_2p)_3 RhCl`
`H_2 - Pd//BaSO_4`

SOLUTION :`R - oversetunderset(||)(O)( C) - Cl+Z to R - oversetunderset(||)(O)(C ) - R , Z = R_2 CuLi , Z = R_2Cd`
Discussion
9.

R - overset(O)overset(||)(C) - OR' underset((ii) HNO_(2))overset((i)NH_(2)NH_(2))rarr A underset((iv) NaOH) overset((iii) C_(2)H_(5)OH) rarr B Identify A and B in the above reaction

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`RCHO, RCOOH,
`RNH_(2), RCOOH`
`RN_(2)^(oplus) Cl^(Theta), R - H`
`RNCO, RNH_(2)`

Solution :`R-overset(O)overset("||")(C)-OR' UNDERSET((ii) HNO_(2))overset((i) NH_(2)NH_(2))(rarr) underset((A))(RNCO) underset((iv) NaOH)overset((III) C_(2)H_(5)OH)(rarr)R-NH_(2)`
Discussion
10.

R-overset(O)overset(||)N to O and R-O-N = O are a pair of

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CHAIN isomers
Metamers
Functional isomers
Tautomers

Answer :C
Discussion
11.

R-overset(O)overset(||)C-Roverset(?)rarr-R Idenitify the number of reagents that can be used for above conversion.

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ANSWER :3
Discussion
12.

R-overset(O)overset(||)C-H+ NH_3 + HCN to A overset(H_3 O^(+))to Brespectively A and B can be

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`RCH=NH`

ANSWER :A::B::D
Discussion
13.

R-overset(O)overset(||)(C)-Cl overset(NH_(3))toNH_(4)Cl+(X) overset(P_(4)O_(10))underset(Delta)to(Y) overset((i) DIBAL -H)underset((ii)H_(2)O)to(Z) The compound (Z) is

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R-COOH
`R-CH_(2)-OH`
`R-C-=N`
RCHO

Solution :(X), `RCONH_(2) " " (Y) R-C-=N "" (Z) R-CHO`
Discussion
14.

R-overset+overset(NH_3)overset|CH-COO^(-) overset(pH=12)to R-oversetoverset(NH_2)|CH-COO^(-) overset(H^+) to Zcompound Z is

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`R-oversetoverset(NH_2)|CH-COO^-`
`R-oversetoverset(" "+)(NH_3)overset|CH-COO^-`
`R-oversetoversetoverset+(NH_3)|CH-COOH`
`R-oversetoverset(NH_2)|CH-COOH`

SOLUTION :`-NH_2` is a better BASE than - `COO^-` GROUP. Hence, Z=R-CH-`COO^-`
Discussion
15.

R-OH + HX to R-X + H_(2)O. In this reaction, the reactivity of alcohols is

Answer»

TERTIARY GT SECONDARY gt PRIMARY
Tertiary LT Secondary lt Primary
Tertiary gt Priamry gt Secondary
Secondary gt Primary gt Tertiary

Answer :A
Discussion
16.

R-OH +SOCl_2 overset("Pyridine") to R-Cl+SO_2+HCl Pyridine in the above reaction -

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CATALYSES the reaction
is USED to DISSOLVE ALKYL chloride.
is used to remove otherimpurities .
is used to absorb `SO_2` gas

Answer :A
Discussion
17.

R-OH + HX rarr R - X + H_(2)O In the above reaction, the reactivity of different alcohols is

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TERTIARY `GT` SECONDARY `gt` PRIMARY
tertiary `gt` secondary `LT` primary
tertiary `lt` secondary `gt` primary
secondary `lt` primary `lt` tertiary.

Solution :Tertiary `gt` Secondary `gt` Primary.
Discussion
18.

R-OH chrial central and is optically active. It is subjected to following reaction : I ROH overset(PCl_(5)) tooverset(Alc. KOH) to II ROHoverset(PCl_(5)) tooverset(Ag_(2)O""//H_(2)O) to Configruation about chiral centre is retainedin

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I
II
both 'a' and 'B'
NONE of these

Answer :B
Discussion
19.

R- OH+ HCl underset(Delta)overset("Anhy." ZnCl_(2))to X+ H_2O What is X?

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R- Cl
R- CO-R
R- COOH
R-O-R

Solution :`R- OH+ HCL UNDERSET(DELTA)overset("Anhy." ZnCl_(2))to R-Cl+ H_2O`
Discussion
20.

R-O-R' + HI overset"cold"to ROH+R'+I If R contains three carbon atoms then how many carbon atoms are in R' ?

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2
4
5
6

Answer :A
Discussion
21.

R - NO_(2) overset(Sn + conc.Hcl)to X.Inthisreaction Xis

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`R - CL`
`R - NH_(2)`
`R-SnCl_(2)`
`R - NH_(3)^(+) Cl^(-)`

Answer :B
Discussion
22.

R-NH_(2)+xKOH+CHCl_(3) to R-N-=CH where x is moles of KOH consumed, and is equal to

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1
2
3
4

Answer :C
Discussion
23.

R-NH_2 + underset"(excess)"(CH_3COCl)to A The product (A) will be-

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`RNHCOCH_3`
`RN(COCH_3)_2`
`Roverset+N(COCH_3)_3Cl^-`
`R-CONH_2`

SOLUTION :Acylation occurs in one step only because lone PAIR of nitrogen is delocalized with acyl group.
Discussion
24.

R-NH-COHunderset("pyridine")overset(POCl_(3))rarr product

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`R-N=C=O`
`R-N=C^(-)`
`R-C-=N`
NONE of these

Solution :N-alkyl formamides when DEHYDRATED with `POCl_(3)` in presence of pyridine give isocyanides.
Discussion
25.

R-N equiv C+HgO rarr A+Hg_2O, What is A:

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`RNH_2`
`RCONH_2`
R-NCO
RCOOH

Answer :C
Discussion
26.

R-NC+ HgO to Hg+X Here, the compound X is

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`R -ONC`
R- CON
R -CNO
R- NCO

Answer :D
Discussion
27.

R-COOH to R-CH_(2)-OH. Name the reagent used in this conversion.

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SOLUTION :`LiAlH_(4)` is PRESENCE of THF.
Discussion
28.

R-COOH+(CF_(3)CO)_(2)OrarrX overset(R'-OH)rarrY+Z:

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`Y " is "R'-underset(O)underset("||")C-O-R`
`X " is "R-underset(O)underset("||")C-O-underset(O)underset("||")C-CF_(3)`
`Y " is "R-underset(O)underset("||")C-O-R'`
`Z " is "CF_(3)-COOH`

Answer :B::C::D
Discussion
29.

R-COOH overset(A)(" "rarr)R- COCl. What is A

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HCl
NaCl
`SOCl_(2)`
`Cl_(2)`

ANSWER :C
Discussion
30.

R_1 - COCl+R_2 C d -> CdCl+X The organic compound 'X' is

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a KETONE
an ALDEHYDE
an ALCOHOL
a PHENOL

ANSWER :A
Discussion
31.

R- COCl is converted into aldehyde by using

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`PD . BaSO_(4)+` quinoline
`SnCl_(2)+HCL`
`DIB-Al-H`
`LiAlH_(4)`

Answer :A
Discussion
32.

R-CN" and "R-overset(overset(O)(||))(C)-NH_(2) both can be reduced to R-CH_(2)-NH_(2) by using suitable reducing agents.

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ANSWER :1
Discussion
33.

R -COCH_3 overset( X_2//OH^(-))to CHX_3 +"Carboxylate ion"overset( H^+)to Carboxylic acid . In the above sequence, the carboxylic acid obtained is

Answer»

` CH_3 COOH`
` HCOOH`
` RCOOH`
` RCH_2COOH`

ANSWER :C
Discussion
34.

R-Cl is hydrolysed to R-OH slowly but the reaction is rapid in presence of KI as catalyst. Explain.

Answer»

SOLUTION :KI supplies `L^(-)` ion which is strong nucleophile and hence reacts RAPIDLY with R-Cl to form `R-I. I^(-)` is also a better leaving GROUP than `Cl^(-)` . Hence R-I is HYDROLYSED rapidly to form R-OH and `I^(-).. I^(-)`ion is again used in converting R-Cl to R-I.
`R-Cl + H_2O overset("slow)(rarr)R-OH+Cl^(-)`
`R-Cl + I^(-) underset(-Cl^(-))overset("fast")(rarr) R - I underset("fast")overset(+H_2O)(rarr)R-OH`
Discussion
35.

R - CO - R'overset(HCN) to A overset(B) to R - underset(CH_(2)-NH_(2)) underset(|) overset(OH) overset(|) (C) - R A and B are

Answer»

`A = R - underset(CN) underset(|) overset(OH) overset(|) (C) - R'""B = NA + C_(2) H_(5)OH`
`A = R - underset(COOH) underset(|) overset(OH) overset(|) (C) - R'""B = H_(3)O^(+)`
`A = R - underset(CN) underset(|) overset(OH) overset(|) (C) - R' ""B = NH_(3)`
`A = R -overset(R')overset(|) (CH) - CN "" B= NaOH`

Answer :A
Discussion
36.

R-CO-NH_2 overset(Br_2//KOH)to RNH_2 which of the following are formed as species/compounds in the above conversion.

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`RCONHBr`
`RNCO`
`RCO overset(* *)N Br`
`RCO overset(* *)N Br_2`

SOLUTION :Given reaction is Hoffmann DEGRADATION mechanism
Discussion
37.

R-CH=CH-CHO+NH_(2)-overset(O)overset("||")C-NHNH_(2)overset(H^(+))to X (X) in the above reaction is

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`R-CH=CH-overset(OH)overset(|)(CH)-NH_(2)CONHNH_(2)`
`R-CH=CH-CH=N-NH-overset(O)overset("||")C-NH_(2)`
`R-CH=NH_(2)CONH_(2)`
`R-CH=CH-UNDERSET(OH)underset(|)(CH)-NH_(2)COCH=NHNH_(2)`

Answer :B
Discussion
38.

R-CH=CH_2underset( C_2H_5OH)overset(Na//NH_3(l))rarrRCH_2CH_3

Answer»

CLEMMENSEN reduction
Fisher-Spier reduction
Birch reduction
Arndt-Eistert reduction

Answer :A
Discussion
39.

R - CH = CH_(2) + CO + H_(2) overset(High Temp) underset (High Pressure) to RCH_(2) CH_(2) CHO.

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Mendius REACTION
OXO process
Sandorn's reaction
STEPHEN's reaction

ANSWER :B
Discussion
40.

R- CH_(2)OH underset([O]CH_(2)Cl_(2))overset("PCC")to X What is X ?

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R-COOH
R-CHO
R-CO-H
R-O-H

Solution :`underset(1^(@)-"Alcohol")(R- CH_(2)OH) underset(CH_(2)Cl_(2))OVERSET("PCC[O]")to underset("ALDEHYDE")(R- CHO)`
Discussion
41.

R-CH_(2)-overset(O)overset("||")C-OH overset(P//Cl_(2))underset(H_(2)O)rarrR-overset(Cl)overset(|)CH-overset(O)overset("||")C-OH Which of the following are intermediate species reponsible for product ?

Answer»

`R-CH_(2)-overset(O)overset("||")C-CL`
`R-overset.CH-overset(O)overset("||")C-OH`
`R-CH=UNDERSET(Cl)underset(|)C-OH`
`R-underset(Cl)underset(|)CH-overset(O)overset("||")C-Cl`

Answer :A::C::D
Discussion
42.

R- CH_(2)OH underset(Na_2Cr_2O_7//H_2SO_4-H_(2)O)overset([O])to X ,What is X?

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R-COOH
`R-CHO`
R-CO-R
`R- O-H`

SOLUTION :`UNDERSET(1^(@)-"Alcohol")(R- CH_(2)OH )underset(Na_2Cr_2O_7//H_2SO_4-H_(2)O)overset([O])to underset("Aldehyde")(R-CHO`)
Discussion
43.

R - CH_(2)_CH_(2) OH can be converted into RCH_(2)COOH. The reaction is

Answer»

reduction
hydrolysis
OXIDATION
decarboxylation

Solution :We know that ,
`RCH_(2) CH_(2) OH overset("Oxidation ") to RCH_(2)COOH`.
Discussion
44.

R - CH_(2) - NO_(2) overset(Dil.H_(2) SO_(4)) to A+ B A, B arerespectively

Answer»

R-COONH, `NH_(2) OH`
`R-COOH, NH_(4) OH`
`RCONHOH , NH_(3)`
`RCONH_(2), ROOH`

Answer :A
Discussion
45.

R-CH_(2)-CH_(2)OH can be converted into RCH_(2)CH_(2)COOH. The correct sequence of reagents is

Answer»

`PB r_(3),KCN,H^(+)`<BR>`PBr_(3),KCN,H_(2)`
`KCN,H^(+)`
`KCN,PB r_(3),H^(+)`

Solution :`RCH_(2)CH_(2)OH overset(PBr_(3))toRCH_(2)CH_(2)Br overset(KCN)to RCH_(2)CH_(2)CN overset(H^(+))to RH_(2)CH_(2)COOH`
Discussion
46.

R-CH_2-CH_2OH can be converted into RCH_2CH_2COOH. The correct sequence of reagent is

Answer»

`PBr_3 , KCN , H^+`
`PBr_3, KCN , H_2`
`KCN , H^+`
`HCN , PBr_3, H^+`

SOLUTION :`RCH_2CH_2OH OVERSET(PBr_2)to RCH_2CH_2Broverset(KCN)to RCH_2CH_2CN overset(H^+)to RCH_2CH_2COOH`
Discussion
47.

R-CH_2-C Cl_2-Roverset"Reagent"to R-C-=C-R The reagent is

Answer»

Na
HCl and `H_2O`
KOH in `C_2H_5OH`
Zn

Solution :`R-CH_2-C Cl_2-Roverset(KOH+C_2H_5OH)to R-C-=C-R+2HCl`
This REACTION is an EXAMPLE of dehydrohalogenation . Hence, alcoholicKOH is USED as a REAGENT
Discussion
48.

R - CH_(2) - CH_(2) - OH can be convertedinto R - CH_(2) - CH_(2) - COOH. Thecorrectsequenceof regentsis .

Answer»

`PBr_(3) ,KCN, H^(+)`
`PBr_(3), KCH ,_(2)`
`KCN,H^(+)`
`HCN, PBr_(3),H`

SOLUTION :
Discussion
49.

R-CH_2 -CH_2 OH can be converted into RCH_2 CH_2 COOH. The correct sequence of reagents is :

Answer»

`PBr_3 , KCN , H_3O^(+) `
` PBr_3, KCN ,H_2//pt`
` KCN ,H_3 O`
` HCN ,PBr_3 ,H_3O^(+) `

ANSWER :A
Discussion
50.

R - CH = CH_(2) + CO + H_(2) underset("High pressure" ) overset("High temp")(rarr) RCH_(2) CH_(2)CHO. the above reaction is

Answer»

Mendius reaction
OXO process
Sandorn's reaction
Stephen's reaction

Solution :Reaction of alkenes with water gas DONE USING the bis-tertacarbonylcobalt(0) CATALYST RESULTS in formylation of alkene giving aldehydes.
Discussion