995 + Interview Questions in HYDROCARBONS IN GENERAL AWARENESS Page 7 InterviewSolution

301.	Which of the following activates the benzene ring most towards electrophilic substitution ?A. `-CHO`B. `-NR_2`C. `-NHCOCH_3`D. `-NO_2`
Answer» Correct Answer - B

Discussion

302.	A knocking sound is produced in the internal combustion engine when the fuelA. burns slowlyB. burns fastC. contains some waterD. is contaminated with lubricating oil.
Answer» Correct Answer - B

Discussion

303.	What is decreasing order of Boiling point A. `AgtBgtC`B. `BgtCgtA`C. `AgtCgtB`D. `CgtBgtA`
Answer» Correct Answer - a Boiling point of alkane `prop (1)` Molecular mass `(2) (1)/(1)/(Branchi ng)`

Discussion

304.	The relative rates of hydrogenation is in the order ofA. `CH_(2)=CH_(2)gt RCH =CH_(2)gtRCH=CHRgtR_(2)C=CHR`B. `R_(2)C=CHRgtRCH=CHRgtRCH=CH_(2)gt CH_(2)=CH_(2)`C. `RCH=CHRgtR_(2)C=CHRgtRCH=CH_(2)gtCH_(2)=CH_(2)`D. `R_(2)C=CHRgtCH_(2)=CH_(2)gtRCH=CHRgtRCH=CH_(2)`
Answer» Correct Answer - a Rate of Hydrogenation `prop (1)/("crowdi ng across pi bond ")` `(" Hydrogenation follow syn addition ")`

Discussion

305.	Assertion `:` Benzene removes a butter stain from a table cloth. Reason `:` Butter has an affinity towards benzeneA. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
Answer» Correct Answer - b benzene is a non `-` polar solvent. Butter is composed of organic compounds of low polarity. So, it gets dissolved in benzene.

Discussion

306.	Why do alkenes show addition reactions?
Answer» Due to the presence of loosely help `pi`-electrons.

Discussion

307.	What is the monomer used in the manufacture of TV cabinets?
Answer» Correct Answer - Polypropene.

Discussion

308.	Which of the following compounds will not undergo Friedel`-` Crafts reaction easily ?A. xyleneB. NitrobenzeneC. TolueneD. Cumene
Answer» Correct Answer - b `NO_(2)` group is meta `-` directing and deactivates ring for further substitution. It is an electron `-` withdrawing group.

Discussion

309.	An inhibitor is described as,A. a substance that slows down or stops a reactionB. a substnace which inhibits the properties of a catalystC. a substance formed during the reaction and does not participate in the reactionD. a substance which prevents formationn of products in a reaction being most reactive.
Answer» Correct Answer - A

Discussion

310.	Kerosene is a mixture ofA. aromatic hydrocarbonsB. aliphatic hydrocarbonsC. unsaturated hydrocarbonsD. saturated hydrocarbons.
Answer» Correct Answer - B

Discussion

311.	Assertion. Conformers are impractical to separate Reason. Conformers have negligibly small difference in their potential energyA. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is false.D. If both assertion and reason are false
Answer» Correct Answer - A

Discussion

312.	When propyne reacts with aqueous `H_(2)SO_(4)` in the presence of `HgSO_(4)`, the major product isA. PropanolB. propyl hydrogen sulphateC. AcetoneD. Propanol
Answer» Correct Answer - c `CH_(3)-C-=CH overset(H_(2)SO_(4) // HgSO_(4))rarr CH_(3)-COCH_(3)`

Discussion

313.	The structural formula of the compound which yields ethylene upon reaction with zinc-A. `CH_(2)Br-CH_(2)Br`B. `CHBr_(2)-CHBr_(2)`C. `CHBr=CHBr`D. none
Answer» Correct Answer - A `underset(Br)underset(\|)(C)H_(2)-underset(Br)underset(\|)(C)H_(2)overset(Zn)toCH_(2)=CH_(2)+ZnBr_(2)`

Discussion

314.	The relative acidity of ehtyne, ethene and ethane follows the order-A. Ethane`gt`Ethyne`gt`EtheneB. Ethyne`gt`Ethene`gt`EthaneC. Ethyne`lt`Ethene`lt`EthaneD. Ethene`lt`Ethane`lt`Ethyne
Answer» Correct Answer - B Acidic strength `prop` stability of conjugate base `prop` % s-character.

Discussion

315.	Predict the order of base strength of anions from the reactions given below. `HC=CH+LiNH_(2)` hArr HC-= C^(-)Li^(+)+NH_(3)` `HC-=C Li+H_(2)O hArr HC-=CH+LiOH`A. `OH^(-) lt HC-=C^(-) lt NH_(2)^(-)`B. `HC-= C-lt OH^(-)lt NH_(2)^(-)`C. `OH^(-)lt NH_(2)^(-) lt HC-=C^(-)`D. `NH_(2)^(-) lt OH^(-) lt HC-=C^(-)`
Answer» Correct Answer - A A stonger acid replaces a weaker acid from its salt. Hence, `HC -= CH gt NH_(3) (` acidic strength `)` and `H_(2)O gt HC -=CH. ` `:. H_(2)OgtHC -= CH gt NH_(3)(` acidic strength order `)` Hence, for conjugate bases `: OH^(-)HC-=C^(-)ltNH_(2)^(-)`( basic strength order)

Discussion

316.	Olefines can be converted to paraffins by-A. HalogenationB. HydrolysisC. HydrationD. Hydrogenation
Answer» Correct Answer - D `underset("alkene (olefines)")(R-CH=CH_(2)+)H_(2)overset("Catalyst")tounderset("Alkane(paraffines)")(R-CH_(2)-CH_(3))`

Discussion

317.	Which of the following reagents give lewisite?A. `C_(2)H_(4) and S`B. `C_(2)H_(2) and AsCl_(3)`C. `C_(2)H_(2) and HCN`D. The name is simply associated with one of the theories of acids-bases
Answer» Correct Answer - B `{:(CH),("\|\|\|"),(CH):}+ClAsCl_(2)rarr underset("Lewisite")({:(CH-Cl),("\|\|"),(CHAsCl_(2)):})`

Discussion

318.	Which of these will not react with acetylene?A. `NaOH`B. Ammoniacal silver nitrateC. NaD. HCl
Answer» Correct Answer - A Nucleophilies and alkalies normally do not react with acetylene. Therefore, `NaOH` has not action on acetylene.

Discussion

319.	Which of the following does not show geometrical isomerism?A. 1,2-Dichloropent-1-eneB. 1,3-Dichloropent-2-eneC. `1,1-Dichloropent-1-eneD. 1,4-Dichloropent-2-ene
Answer» Correct Answer - C `CH_(3)CH_(2)CH_(2)CH=C Cl_(2)` does not show geometrical isomerism because two chlorine atoms are attached to terminal carbon atom.

Discussion

320.	Define geometrical isomerism
Answer» The isomerism which arises due to the difference in spatial arrangement of atoms or groups about doubly bonded carbon (C=C) atoms is called geometrical isomerism.

Discussion

321.	Which of the following will not show geometrical isomerism ?A. B. C. D.
Answer» Correct Answer - D For geometrical isomerism , it is essential that each carbon atom of the double bond must have different substituents. Now option (d) does not show geometrical isomerism since it has two `CH_3` groups on the same carbon atom of the double bond.

Discussion

322.	The number of isomeric sodium salt that will be required to obtain neopentane isA. 3B. 1C. 4D. 6
Answer» Correct Answer - b `CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C )-CH_(2).CO bar(O) Na^(+) underset(NaOH)overset(CaO)(to) CH_(3) - underset(CH_(3))underset(\|)overset(CH_(3))underset(\|)(C )-CH_(3)`

Discussion

323.	The increasing order of reduction of alkyl halides with zinc and dilute HCl isA. R-Cl lt R-I lt R-BrB. R-Cl lt R-Br lt R-IC. R-I lt R-Br lt R-ClD. R-Br lt R-I lt R-Cl
Answer» Correct Answer - B The reactivity of reduction of alkyl halides with Zn/HCl increases as the strength of the C-X bond decreases , i.e., R-Cl lt R-Br lt R-I

Discussion

324.	The increasing order of reduction of alkyl halides with zinc and dilute `HCl` isA. `R-CL lt R-I lt R-Br`B. `R-Cl lt R-Br lt R-I`C. `R-I lt R- Br lt R-Cl`D. `R-Br lt R-I lt R-Cl`
Answer» Correct Answer - B The increasing order of reduction of alkyl halides with zinc and dil. HCl is `R-Cl lt R-Br lt R-I` As the size of the halogen increases down the group, the strength of C-X bond decreases, as a result, reactivity increases.

Discussion

325.	Ethyl iodide when reduced by zinc and dilute HCl, leads to the formation of ………….. (A) Methane (B) Ethane (C) Ethylene (D) Butane
Answer» Correct option is: (B) Ethane \(\underset{Ethyl\,\,iodide}{CH_3-CH_2-I}\xrightarrow{zn/HCl}\underset{Ethane}{CH_3-CH_3+HI}\) Correct option is (B) Ethane

325.

Ethyl iodide when reduced by zinc and dilute HCl, leads to the formation of ………….. (A) Methane (B) Ethane (C) Ethylene (D) Butane

Answer»

Correct option is: (B) Ethane

\(\underset{Ethyl\,\,iodide}{CH_3-CH_2-I}\xrightarrow{zn/HCl}\underset{Ethane}{CH_3-CH_3+HI}\)

Correct option is (B) Ethane

Discussion

326.	When an alkyl chloride is treated with Na in dry ether, a symmetrical alkane is obtained. The reaction is known asA. Birch redcuctionB. Frankland reactionC. Wurtz reactionD. Halogenation reaction.
Answer» Correct Answer - C

Discussion

327.	Which of the following alkane has lowest boiling point and highest melting point ?A. n-PentaneB. IsopentaneC. NeopentaneD. n-Hexane
Answer» Correct Answer - C Due to least surface area, neopentane has the lowest b.p. but due to high symmetry it has the highest m.p.

Discussion

328.	Which method cannot be employed for production of an alkane?A. Heating sodium salts of carboxylic acids with soda limeB. Treating alkyl halides with Na in ethereal solution.C. Electrolysis of aqueous solution of sodium or potassium salt of carboxylic acidD. Dehydrohalogenation of alkyl halides .
Answer» Correct Answer - D

Discussion

329.	What are the necessary conditions for any system to be aromatic?
Answer» The necessary conditions for a molecule to be aromatic are: (i)It should have a single cyclic cloud of delocalised pi electrons above and below the plane of the molecule. (ii)It should be planar. This is because complete delocalisation of pi electrons is possible only if the ring is planar to allow cyclic overlap of p-orbitals. (iii)It should contain Huckel number of electrons, i.e. (4n+2) pi electrons where n=0,1,2,3….etc. A molecule which does not satisfy any one or more of the above condition is said to be non aromatic

329.

What are the necessary conditions for any system to be aromatic?

Answer»

The necessary conditions for a molecule to be aromatic are:

(i)It should have a single cyclic cloud of delocalised pi electrons above and below the plane of the molecule.

(ii)It should be planar. This is because complete delocalisation of pi electrons is possible only if the ring is planar to allow cyclic overlap of p-orbitals.

(iii)It should contain Huckel number of electrons, i.e. (4n+2) pi electrons where n=0,1,2,3….etc.

A molecule which does not satisfy any one or more of the above condition is said to be non aromatic

Discussion

330.	Which among the following alkane has the highest melting point?A. n-PenteneB. n-HexeneC. n_HeptaneD. n-Octane
Answer» Correct Answer - D

Discussion

331.	The reaction of alkyl halides with sodium in dry ether to give higher alkanes is called ……….. (A) Wurtz reaction (B) Kolbe’s reaction (C) Frankland’s reaction (D) Williamson’s reaction
Answer» Correct option is: (A) Wurtz reaction 2R - Br \(\underset \longrightarrow {Na/dry\, ether}\) R _R + 2Na Br This reaction called Wurtz reaction (A) Wurtz reaction

331.

The reaction of alkyl halides with sodium in dry ether to give higher alkanes is called ……….. (A) Wurtz reaction (B) Kolbe’s reaction (C) Frankland’s reaction (D) Williamson’s reaction

Answer»

Correct option is: (A) Wurtz reaction

2R - Br \(\underset \longrightarrow {Na/dry\, ether}\) R _R + 2Na Br

This reaction called Wurtz reaction

(A) Wurtz reaction

Discussion

332.	Give reason for the following: The boiling points of alkanes decreases with branching.
Answer» With branching the shape of the molecule tends to approach that of a sphere . As a result, the surface area of the branched isomers decreases, so the vander waals forces of attraction between their molecule decreases, so the boiling point decreases.

Discussion

333.	Which one of the following cannot be prepared by Wurtz reaction ?A. `CH_(4)`B. `C_(2)H_(6)`C. `C_(3)H_(8)`D. `C_(4)H_(10)`
Answer» Correct Answer - a a

Discussion

334.	Rotation around carbon-carbon single bond of ethane is not completely free. Justify the statement.
Answer» Ethane contains carbon-carbon sigma (σ) bond. Electron distribution of the sigma molecular orbital is symmetrical around the internuclear axis of the C-C bond which is not disturbed due to rotation about its axis. This permits free rotation around a C-C single bond. However, rotation around a C-C single bond is not completely free. It is hindered by a small energy barrier due to weak repulsive interaction between the adjacent bonds. Such a type of repulsive interaction is called torsional strain. Of all the conformations of ethane, the staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain. The energy difference between the two extreme forms is of the order of 12.5 kJ mol, which is very small. It has not been possible to separate and isolate different conformational isomers of ethane.

Discussion

335.	What is cracking/ pyrolysis?
Answer» The decomposition of higher alkane into a mixture of lower alkanes,alkenes etc by the application of heat is called pyrolysis/cracking.

Discussion

336.	Which of the following has the highest point ?A. o-xyleneB. m-xyleneC. p-xyleneD. Toluene
Answer» Correct Answer - C

Discussion

337.	Chlorobenzene on treatment with sodium in dry ether gives diphenyl. The name of the reaction isA. Fittig reactionB. Wurtz-Fitting reactionC. Sandmeyer reactionD. Gatterman reaction
Answer» Correct Answer - A

Discussion

338.	The reaction of toluene with `Cl_2` in presence of `FeCl_3` gives predominantlyA. Benzyl chlorideB. o- and p-chlorotolueneC. m-chorotolueneD. benzoyl chloride
Answer» Correct Answer - B

Discussion

339.	Presence of a nitro group in a benzene ringA. deactivates the ring towards electrophilic substitutionB. activates the ring towards electrophilic substitutionC. renders the ring basicD. deactivates the ring towards nucleophilic substitution
Answer» Correct Answer - A

Discussion

340.	Presence of a nitro group in a benzene ring.A. Activites the ring towards electrophilic substitutionB. Renders the ring basicC. Deactivites the ring towards nucleophilic substitutionD. Deactivites the ring towards electrophilic substitution
Answer» Correct Answer - d d

Discussion

341.	In which reaction , polysubstitution takes place `:`A. B. C. D.
Answer» Correct Answer - b b

Discussion

342.	Hydrolysis of calcium carbid gives a solution with PhA. 7B. `gt 7`C. ` lt 7`D. 0
Answer» Correct Answer - B `CaC_(2)+2H_(2)O to C_(2)H_(2) to C_(2)H_(2)+Ca(OH)_(2)` Due to the formation of `Ca(OH)_(2)`, the solution is basic, pH is greater than 7

Discussion

343.	Which of the following is the chain termination step during photochlorination of ethane:A. `CH_(3)-overset(.)(CH_(2))+overset(.)(Cl)toCH_(3)-CH_(2)-Cl`B. `CH_(3)-overset(.)(CH_(2))+CH_(3)-overset(.)(CH_(2))toCH_(3)CH_(2)CH_(2)CH_(3)`C. `overset(.)(C)l+overset(.)(C)l to Cl_(2)`D. `overset(.)(C)l+overset(.)(H)toHCl`
Answer» Correct Answer - A::B::C `overset(.)(H)` is not formed during photohalogenation of alkene

Discussion

344.	The addition of `O_(2)` gas to a reaction mixture of `CH_(4) and Cl_(2)` undergoing photochlorination willA. acceleration the reactionB. retards the reaction for some timeC. does not effect the rate of reactionD. slows down the rate of reaction permanentry
Answer» Correct Answer - B Halogenation of alkanes occurs by free radical mechanism and is inhibited by free radical inhibitors like oxygen.

Discussion

345.	`CH_(3)CH_(2)CH=CH_(2) overset(NBs)to X overset(alc. KOH)to Y`. The compound Y isA. But-2-en-2-olB. But-3-en-1-olC. 1,3-ButadienceD. 1,2-Butadiene
Answer» Correct Answer - C `CH_(3)CH_(2)CH=CH_(2) overset("set")to CH_(3)-overset(Br)overset(\|)(CH)-CH=CH_(2) underset(-KBr,-H_(2)O)overset(alc.KOH)to underset("1-3-Butadiene")(CH_(2)=CH-CH=CH_(2))`

Discussion

346.	Aromatic electrophilic substitution reaction that is reversible isA. nitrationB. chlorinationC. sulphonationD. alkylation
Answer» Correct Answer - C Sulphonation is a reversible reaction.

Discussion

347.	Which one of the following undergoes nitration most readily ?A. AcetophenoneB. BenzonitrileC. BenzaldehydeD. benzene
Answer» Correct Answer - D Acetophenone, benzonitrile, benzaldehyde and benzoic acid all contain electron-withdrawing groups, therefore, in all these compounds the electron density over the phenyl ring is lower than in benzene. Thus, benzene undergoes electrophilic nitration most readily.

Discussion

348.	Among the following the aromatic compounds isA. B. C. D.
Answer» Correct Answer - A Only (a) has `2pi`-electrons and hence is aromatic. All others have `4 pi` electrons and hence are antiaromatic.

Discussion

349.	The non-aromatic compound among the followingA. B. C. D.
Answer» Correct Answer - A Cyclopentadiene , i.e., option (a) contains only 4 `pi`-electrons and is also non-planar , therefore, it is non aromatic.

Discussion

350.	On vigorous oxidaiton by permanganate solution `(CH_(3))_(2)C=CHCH_(2)CHO` givesA. `(CH_(3))_(2)CO` and `OHC CH_(2)CHO`B. `(CH_(3))_(2)underset(OH)underset(\|)(C)-underset(OH)underset(\|)(CH)-CH_(2)CHO`C. `(CH_(3))_(2)CO` and `OHC CH_(2)COOH`D. `(CH_(3))_(2)CO` and `CH_(2)(COOH)_(2)`
Answer» Correct Answer - D C=C bond is cleaved and oxidised to -COOH, -CHO group is also oxidised to -COOH. `(CH_(3))_(2)C=CHCH_(2)CHO rarr (CH_(3))_(2)C=O+HOOC-CH_(2)-COOH`

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following activates the benzene ring most towards electrophilic substitution ?A. `-CHO`B. `-NR_2`C. `-NHCOCH_3`D. `-NO_2`

A knocking sound is produced in the internal combustion engine when the fuelA. burns slowlyB. burns fastC. contains some waterD. is contaminated with lubricating oil.

What is decreasing order of Boiling point A. `AgtBgtC`B. `BgtCgtA`C. `AgtCgtB`D. `CgtBgtA`

The relative rates of hydrogenation is in the order ofA. `CH_(2)=CH_(2)gt RCH =CH_(2)gtRCH=CHRgtR_(2)C=CHR`B. `R_(2)C=CHRgtRCH=CHRgtRCH=CH_(2)gt CH_(2)=CH_(2)`C. `RCH=CHRgtR_(2)C=CHRgtRCH=CH_(2)gtCH_(2)=CH_(2)`D. `R_(2)C=CHRgtCH_(2)=CH_(2)gtRCH=CHRgtRCH=CH_(2)`

Why do alkenes show addition reactions?

What is the monomer used in the manufacture of TV cabinets?

Which of the following compounds will not undergo Friedel`-` Crafts reaction easily ?A. xyleneB. NitrobenzeneC. TolueneD. Cumene

Kerosene is a mixture ofA. aromatic hydrocarbonsB. aliphatic hydrocarbonsC. unsaturated hydrocarbonsD. saturated hydrocarbons.

When propyne reacts with aqueous `H_(2)SO_(4)` in the presence of `HgSO_(4)`, the major product isA. PropanolB. propyl hydrogen sulphateC. AcetoneD. Propanol

The structural formula of the compound which yields ethylene upon reaction with zinc-A. `CH_(2)Br-CH_(2)Br`B. `CHBr_(2)-CHBr_(2)`C. `CHBr=CHBr`D. none

The relative acidity of ehtyne, ethene and ethane follows the order-A. Ethane`gt`Ethyne`gt`EtheneB. Ethyne`gt`Ethene`gt`EthaneC. Ethyne`lt`Ethene`lt`EthaneD. Ethene`lt`Ethane`lt`Ethyne

Olefines can be converted to paraffins by-A. HalogenationB. HydrolysisC. HydrationD. Hydrogenation

Which of the following reagents give lewisite?A. `C_(2)H_(4) and S`B. `C_(2)H_(2) and AsCl_(3)`C. `C_(2)H_(2) and HCN`D. The name is simply associated with one of the theories of acids-bases

Which of these will not react with acetylene?A. `NaOH`B. Ammoniacal silver nitrateC. NaD. HCl

Which of the following does not show geometrical isomerism?A. 1,2-Dichloropent-1-eneB. 1,3-Dichloropent-2-eneC. `1,1-Dichloropent-1-eneD. 1,4-Dichloropent-2-ene

Define geometrical isomerism

Which of the following will not show geometrical isomerism ?A. B. C. D.

The number of isomeric sodium salt that will be required to obtain neopentane isA. 3B. 1C. 4D. 6

The increasing order of reduction of alkyl halides with zinc and dilute HCl isA. R-Cl lt R-I lt R-BrB. R-Cl lt R-Br lt R-IC. R-I lt R-Br lt R-ClD. R-Br lt R-I lt R-Cl

The increasing order of reduction of alkyl halides with zinc and dilute `HCl` isA. `R-CL lt R-I lt R-Br`B. `R-Cl lt R-Br lt R-I`C. `R-I lt R- Br lt R-Cl`D. `R-Br lt R-I lt R-Cl`

Ethyl iodide when reduced by zinc and dilute HCl, leads to the formation of ………….. (A) Methane (B) Ethane (C) Ethylene (D) Butane

When an alkyl chloride is treated with Na in dry ether, a symmetrical alkane is obtained. The reaction is known asA. Birch redcuctionB. Frankland reactionC. Wurtz reactionD. Halogenation reaction.

Which of the following alkane has lowest boiling point and highest melting point ?A. n-PentaneB. IsopentaneC. NeopentaneD. n-Hexane

Which method cannot be employed for production of an alkane?A. Heating sodium salts of carboxylic acids with soda limeB. Treating alkyl halides with Na in ethereal solution.C. Electrolysis of aqueous solution of sodium or potassium salt of carboxylic acidD. Dehydrohalogenation of alkyl halides .

What are the necessary conditions for any system to be aromatic?

Which among the following alkane has the highest melting point?A. n-PenteneB. n-HexeneC. n_HeptaneD. n-Octane

The reaction of alkyl halides with sodium in dry ether to give higher alkanes is called ……….. (A) Wurtz reaction (B) Kolbe’s reaction (C) Frankland’s reaction (D) Williamson’s reaction

Give reason for the following: The boiling points of alkanes decreases with branching.

Which one of the following cannot be prepared by Wurtz reaction ?A. `CH_(4)`B. `C_(2)H_(6)`C. `C_(3)H_(8)`D. `C_(4)H_(10)`

Rotation around carbon-carbon single bond of ethane is not completely free. Justify the statement.

What is cracking/ pyrolysis?

Which of the following has the highest point ?A. o-xyleneB. m-xyleneC. p-xyleneD. Toluene

Chlorobenzene on treatment with sodium in dry ether gives diphenyl. The name of the reaction isA. Fittig reactionB. Wurtz-Fitting reactionC. Sandmeyer reactionD. Gatterman reaction

The reaction of toluene with `Cl_2` in presence of `FeCl_3` gives predominantlyA. Benzyl chlorideB. o- and p-chlorotolueneC. m-chorotolueneD. benzoyl chloride

Presence of a nitro group in a benzene ringA. deactivates the ring towards electrophilic substitutionB. activates the ring towards electrophilic substitutionC. renders the ring basicD. deactivates the ring towards nucleophilic substitution

Presence of a nitro group in a benzene ring.A. Activites the ring towards electrophilic substitutionB. Renders the ring basicC. Deactivites the ring towards nucleophilic substitutionD. Deactivites the ring towards electrophilic substitution

In which reaction , polysubstitution takes place `:`A. B. C. D.

Hydrolysis of calcium carbid gives a solution with PhA. 7B. `gt 7`C. ` lt 7`D. 0

The addition of `O_(2)` gas to a reaction mixture of `CH_(4) and Cl_(2)` undergoing photochlorination willA. acceleration the reactionB. retards the reaction for some timeC. does not effect the rate of reactionD. slows down the rate of reaction permanentry

`CH_(3)CH_(2)CH=CH_(2) overset(NBs)to X overset(alc. KOH)to Y`. The compound Y isA. But-2-en-2-olB. But-3-en-1-olC. 1,3-ButadienceD. 1,2-Butadiene

Aromatic electrophilic substitution reaction that is reversible isA. nitrationB. chlorinationC. sulphonationD. alkylation

Which one of the following undergoes nitration most readily ?A. AcetophenoneB. BenzonitrileC. BenzaldehydeD. benzene

Among the following the aromatic compounds isA. B. C. D.

The non-aromatic compound among the followingA. B. C. D.

On vigorous oxidaiton by permanganate solution `(CH_(3))_(2)C=CHCH_(2)CHO` givesA. `(CH_(3))_(2)CO` and `OHC CH_(2)CHO`B. `(CH_(3))_(2)underset(OH)underset(|)(C)-underset(OH)underset(|)(CH)-CH_(2)CHO`C. `(CH_(3))_(2)CO` and `OHC CH_(2)COOH`D. `(CH_(3))_(2)CO` and `CH_(2)(COOH)_(2)`