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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The rate of Hofmann degradation is influenced by the nature of substituent, G. which of the following represents the correct decreasing rate of degradation with various substituents?A. `-NO_2gt -Nlgt -Hgt -CH_3gt -OCH_3`B. `-OCH_3gt -CH_2gt -Clgt - Hgt -NO_2`C. `-OCH_3gt-CH_3gt-Hgt-Clgt -NO_2`D. `-CH_3gt-Clgt-Hgt-OCH_3gt-NO_2` |
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Answer» Correct Answer - C When the migratory group is aryl (as in the given case), the rate of degradation is increased by the presence of electron releasing substituents in the aromatic ring. |
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| 152. |
Which of the following reactions is appropriate for converting acetamide to methamine?A. Hoffmann hyp0obromamide reactionB. Stephens reactionC. Gabriels phthalimide synthesesD. carbylamine reaction |
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Answer» Correct Answer - A (a). `CH_(3)-underset(O)underset(||)(C)-NH_(2)overset(Br_(2)//4KOH)toCH_(3)-NH_(2)+2KBr+K_(2)CO_(3)` This reaction is known as hoffmann hypobromamide reaction. In this stepping down of series occur. |
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| 153. |
Consider the following sequence of reactions: `CH_3CH_2Br undersetDeltaoverset"aq. KOH"to A undersetDeltaoverset(KMnO_4//H^+)to B undersetDeltaoverset(NH_3)to C underset"Alkali"overset(Br_2)to D` , D isA. `CH_3Br`B. `CH_3CONH_2`C. `CH_3NH_2`D. `CHBr_3` |
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Answer» Correct Answer - C `CH_3CH_2Br undersetDeltaoverset"aq. KOH"to undersetA (CH_3CH_2OH) undersetDeltaoverset(KMnO_4 // H^+)to undersetB (CH_3COOH) overset(NH_3)to CH_3COoverset-ON overset+H_4 oversetDelta to undersetC underset"Acetamide"(CH_3CONH_2) overset(Br_2 //alkali)to undersetDunderset"Methylamine"(CH_3NH_2)` |
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| 154. |
In the reaction A is:A. `Cu_2Cl_2`B. `H_3PO_2` and `H_2O`C. `(H^(+))/(H_2O)`D. `(HgSO_4)/(H_2SO_4)` |
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Answer» Correct Answer - B `H_3PO_2` and `H_2O` bring about replacement of diazonium chloride group by H. |
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| 155. |
Which of the following would not react with `HNO_(2)`?A. N,N-DimethylanilineB. p-ToluidineC. Sulphanilic acidD. Ethylamine |
| Answer» Correct Answer - A | |
| 156. |
Which of the following will be most stable diazonium salt `RN_2^(+)X^(-)`?A. `C_6H_5N_2^(+)X^(-)`B. `CH_3N_2^(+)X^(-)`C. `CH_3CH_2N_2^(+)X^(-)`D. `C_6H_5CH_2N_2^(+)X^(-)` |
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Answer» Correct Answer - A Aromatic diazonium salts, `C_6H_5N_2^(+)X^(-)`, are more stable among the given options due to dispersal of positive charge in benzene ring due to resonance. |
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| 157. |
Which of the following is least basic?A. AnilineB. p-MethylanilineC. DiphenylamineD. Triphenylamine |
| Answer» Correct Answer - D | |
| 158. |
Which of the following reactions is feasible?A. B. C. D. |
| Answer» Correct Answer - C | |
| 159. |
The product of the above reactions is:A. B. C. D. |
| Answer» Correct Answer - D | |
| 160. |
Which is most basic?A. AnilineB. p-nitroanilineC. BenylamineD. m-nitroaniline |
| Answer» Correct Answer - C | |
| 161. |
Which of the following is most basic ?A. `C_6H_5NH_2`B. `(CH_3)_2NH`C. `(CH_3)_3N`D. `NH_3` |
| Answer» Correct Answer - B | |
| 162. |
Which one of the following will give a primary amine of hrdrolysis?A. NitroparaffinB. Alkyl cyanideC. AmideD. Alkyl isocyanide |
| Answer» Correct Answer - D | |
| 163. |
Which one of the following will give a primary amine of hrdrolysis?A. NitroparaffinB. Alkyl cyanideC. OximeD. Alkyl isocyanide |
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Answer» Correct Answer - D `underset("alkyl isoyanide")(RNvec(=)C)+2H_2Ooverset("Hydrolysis")tounderset(1^@"amine")(RHN_2)+underset("formic acid")(HCOOH)` |
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| 164. |
Compound A releases an inert gas with `HNO_2` form isocyanate with `(HgCl_2)/(CS_2)` and a solid with diethyl oxalate. It can beA. an optically active compound containing three C-atomsB. A compound formed by the reduction product of reaction of `AgNC(alc)` with RCl.C. A compound having `-NH_2` group at carbonyl carbon.D. a compound which is formed by acylazide in alkaline medium. |
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Answer» Correct Answer - D `1^@` amines gives `N_2` (inert gas) with `HNO_2` and forms isocyanate with `(HgCl_2)/(CS_2)` and a solid `(N,N]`-dialkyl oxamide) with diethyl oxalate. Thus, it can be (a). `CH_(3)underset(NH_(2))underset(|)(C)HCH_(3)` (optically inactive) (b). `RCloverset(AgCN)toRNCoverset("Reduction")tounderset(2^(@)" amine")(RNHCH_(3))` (c). `R-overset(O)overset(||)(C)-N_(3)underset(-Na_(2)CO_(3))overset(OH^(-))tounderset(1^(@)"amine")(RNH_(2))` (d). `R-overset(O)overset(||)(C)-NH_(2)` (compound with `-NH_(2)` at carbonyl carbon) |
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| 165. |
Mustard gas is obtained byA. the action of dilute acids on mustard seedsB. treating ethylene with mustrad oilC. treating sulphur chloride with ehthyleneD. None of these |
| Answer» Correct Answer - D | |
| 166. |
Oil of mirbane isA. AnilineB. NitrobenzenC. P-nitroanilineD. p-aminoazobenze |
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Answer» Correct Answer - B Nitrobenzene is called oil of mirbane |
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| 167. |
Reaction of aniline with acety1 chloride in the presence of `NaOH` gives .A. aniline hydrochlorideB. acetanilideC. p-chloroanilineD. a red dye |
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Answer» Correct Answer - B `underset"Aniline"(C_6H_5NH_2)+underset"Acetyl chloride"(Cl -COCH_3) overset"NaOH"to underset"Acetanilide"(C_6H_5NHCOCH_3)+HCl` |
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| 168. |
Tertiary amines may be obtained by:A. Gabriel phtalmide synthesisB. heating an alcoholic solution of ammonia with excess of RXC. the hydrolysis of dialkyl cyanamideD. thermal decomposition of quaternary ammonium hydroxide |
| Answer» Correct Answer - B::D | |
| 169. |
Primary amines may be obtained by:A. the reduction of nitroalkanesB. the reduction of alkyl isocyanideC. the decarboxylation of amino acidsD. the hydrolysis of alkyl isocyaide |
| Answer» Correct Answer - A::C::D | |
| 170. |
When primary amines are treated with `HCl`, the product obtained isA. An alcoholB. A cyanideC. An amideD. Ammonium salt |
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Answer» Correct Answer - D `CH_3-CH_2-NH_2+HClrarrCH_3CH_2-NH_3^(+)Cl^(-)` Amines are basic in nature they react with acid to form salt. |
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| 171. |
`CH_3NO_2overset(Sn+HCl)toCH_3X`, the X containsA. `-NH_2`B. `-COOH`C. `-CHO`D. `(CH_3CO)_2O` |
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Answer» Correct Answer - A `CH_3NO_2+6Hunderset(HCl)underset(Sn)toCH_3NH_2+2H_2O` |
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| 172. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion 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. Q. Assertion: Aniline does not undergo Friedel-Crafts reaction. Reaction: Friedel-Crafts is an electrophilic substitution reaction. |
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Answer» Correct Answer - B correct explanation `AlCl_3` forms a salt with aniline `(C_6H_5NH_2^(+)AlCl_3^(-))` which deactivates the benzene ring there by preveting F.C. reaction. |
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| 173. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion 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. Q. Assertion: M-Methoxyaniline (m-anisidine) is a weaker base than p-methoxyaniline (p-anisidine). Reason: At m-position methoxy group can exert only `+R-`effect but not `-I` effect. |
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Answer» Correct Answer - C Correct reason: At m-position methoxy group can exert only `-I-` effect but not `+R` effect. |
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| 174. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion 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. Q. Assertion: `N_3^(-)` is a weaker base than `NH_2^(-)` Reason: The lone pari of electrons on N atom in `N_3^(-)` is in a `sp^2`-orbital while in `NH_2^(-)` it is in an `sp^3`-orbital. |
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Answer» Correct Answer - A Reason is the correct explanation. |
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| 175. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion 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. Q. Assertion: Benzene diazonium chloride does not give test for nitrogen. Reason: Loss of `N_2` gas takes place during heating. |
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Answer» Correct Answer - A Benzene diazonium chloride does not give test of nitrogen as nitrogen gas is evolved on heating. |
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| 176. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion 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. Q. Assertion: Amines are basic in nature. Reason: Presence of lone pair of electrons on nitrogen atom. |
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Answer» Correct Answer - A Amines are basic in nature due to presence of a line pair of electrons on nitrogen. |
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| 177. |
Presence of a nitro group in a benzene ring.A. Activates the ring towards electrophilic substitutionB. Renders the ring basicC. Deativates the ring towards nucleophilic substitutionD. Deactivates the ring towards electrophilic substitution |
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Answer» Correct Answer - D `-NO_2` group shows `-M` effect, so withdraws the electron density from the ring and hence deactivate the ring towards electrophilic aromatic substitution. |
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| 178. |
The conversion of m-nitrophenol to resorcinol inivolves respectively`:`A. hydrolysis, diazotisation and reductionB. hydrolysis, and reduction diazotisationC. reduction diazotisation and hydrolysis,D. diazotisation,reduction and hydrolysis, |
| Answer» Correct Answer - C | |
| 179. |
2,4,6-Trinitrochlorobenzene on warming with water produces:A. chlorobenzeneB. phenolC. picric acidD. no compound since C-Cl bond is stable |
| Answer» Correct Answer - C | |
| 180. |
Presence of a nitro group in a benzene ring:A. deactivites the ring towards electrophlic substitutionB. activities the ring towards electrophilic subtitutionC. renders the ring basicD. deactivities the ring towards nucleophilic substitution |
| Answer» Correct Answer - A | |
| 181. |
An isocyanide on hydrolysis givesA. An amideB. A carboxylic acid and ammoniaC. A N-substituted amideD. A `1^@`-amine and formic acid |
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Answer» Correct Answer - D `R-NC+2H_2OrarrRNH_2+HCOOH` |
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| 182. |
How do you prepare the following ? Propanamine from chloroethane |
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Answer» Preparation of propanamine from chloroethane : Chloro ethane reacts with KCN followed by the reduction forms propanamine `underset("Chloro ethane")(CH_(3)-CH_(2)-Cl-KCN) to underset("Ethyl cyanide")(CH_(3)-CH_(2)-CN) overset(LiA//H_(4)) to underset("Propanamine")(CH_(3)-CH_(2)-CH_(2)-NH_(2))` |
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| 183. |
The correct order of basic strength of following compound is A. `4 gt 2 gt 3 gt 1`B. `4 gt 2 gt 1 gt 3`C. `1 gt 3 gt 2 gt 4`D. `1 gt 3 gt 4 gt 2` |
| Answer» Correct Answer - C | |
| 184. |
(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: Aniline hydrogen sulphate on heating forms a mixture of o-and p-amino suphonic acid. Reason: The sulphonic acid is `overlineepsi` withdrawing. |
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Answer» Correct Answer - B Correct explanation: Aniline hydrogen sulphate on heating decomposes to aniline and `H_2SO_4` Sulphonation of aniline with `H_2SO_4` takes palce (SE reaction) at o- and p-position since `(-NH_2)` group is o-and p-directing. |
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| 185. |
(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: nitration of aniline can be conveniently done by protecting the amino group by acetylation. Reason. Acetylation increases the electron density in the benzene ring. |
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Answer» Correct Answer - C Acetylation decreases the electron density in the benzene ring thereby preventing oxidation. |
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| 186. |
(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: `C_2H_5Br` reacts with alcoholic solution of `AgNO_2` to form nitroethane as the major product. Reason: `NO_2^(-)` is an ambidient ion. |
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Answer» Correct Answer - B The lone pair electrons on N-atom in `AgNO_2` attacks `C_2H_5Br` to form nitroethane as the major product. |
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| 187. |
(a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c) If the assertion is true but reason is false. (d) If assertion is false but reason is true. Q. Assertion: Oxidation of 1-nitronaphthalene gives o-nitrophthalic acid whereas 1-amino naphthalene on oxidation gives phthalic acid. Reason: An amino group attached to the benzene ring makes it resistant to oxidation whereas nito group makes the benzene ring susceptible to oxidation. |
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Answer» Correct Answer - C Amino group preset on benzene ring makes it prone towards oxidation. |
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| 188. |
Gabriel synthesis is used for the preparation ofA. `1^@` amineB. `2^@` amineC. `3^@` amineD. All can be prepared. |
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Answer» Correct Answer - A `1^@` amine or `1^@` aromatic amine containing `eWG` at o- and p-position. |
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| 189. |
Nitroparaffins on reduction give:A. amidesB. alkylamtncsC. ammonium saltsD. acetanilides |
| Answer» Correct Answer - B | |
| 190. |
Rank the following compounds in order of increasing basicity (weakest `rarr` strongest)A. `IVltIIltIltIII`B. `IVltIIIltIltII`C. `IVltIltIIIltII`D. `IIltIltIIIltIV` |
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Answer» Correct Answer - B Alkyl amines are more basic than aryl amines or amides due to delocalization of lone pair of N is later case or in case of amides. Electron withdrawing group line `NO_2` also result in decreased electron density over N-atom of amine group and hence, makes the aniline less basec. Thus, the order of basicity is `IVltIIIltIltII` |
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| 191. |
Which of the following statement is correct?A. Methyl amine is slightly acidic.B. Methyl amine is less basic than ammonia.C. Methyl amine is less basic than dimethyl amineD. methyl amine is less basic than aniline |
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Answer» Correct Answer - C Dimethyl amine `(Me_2NH)` is more basic than `MeNH_2`, due to `(+I)` effect of two (Me) groups. |
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| 192. |
Compare the basicity of the following in gaseous and in a queous state and arrange them in increasing order of basicity. |
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Answer» Givein compounds `CH_(3)NH_(2), (CH_(3))_(2)NH, (CH_(3))_(3)N and NH_(3)`. In the above compounds methly substituted ammonium ion gets stabilised due to dispersal of the positive charge by the +I effect of the methyl group. Hence methyl amine are stronger bases than ammonia. Basic nature of amines increase with increase of methyl groups. This trend is followed in gaseous phase. `(CH_(3))_(3)Ngt (CH_(3))_(2)NHgtCH_(3)NH_(2)gtNH_(3)` In the aqueous phase the substituted ammonium cations get stabilised not only by electron releasing effect of the alkyl group but also by solvation with water molecules. Due to steric hinderance the basic strength of methyl amines in the aqueous state changed as follows `(CH_(3))_(2)NHgt CH_(3)NH_(2)gt(CH_(3))_(3)NgtNH_(3)` |
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| 193. |
Which one of the following is the weakest base?A. ethylamincB. DiethylamineC. ElhylamincD. Ammonia |
| Answer» Correct Answer - A | |
| 194. |
Which of the following is the weakest base?A. `NH_3`B. `C_6H_5NH_2`C. `C_6H_5CH_2NH_2`D. `CH_3NH_2` |
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Answer» Correct Answer - B Aromatic amines are weaker than aliphatic amines and `NH_3` |
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| 195. |
The alkyl cynides when ydrolysed to the corresponding acid, the gas evolved isA. `N_2`B. `O_2`C. `NH_3`D. `CO_2` |
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Answer» Correct Answer - C `R-underset(1^@nitro)(CH_2)-NO_2overset(hydrolysis)toR-COOH+NH_3` |
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| 196. |
The compound oxalate is used for distinguishing primary, secondary and tertiaryA. `CH_3NH_2`B. `(CH_3)_2CHNH_2`C. `CH_3-NH-CH_3`D. `(CH_3)_3N` |
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Answer» Correct Answer - C Out of primary, secondary and tertiary amines, the secondary amines, on reaction with `HNO_2` produce yellow oily compounds called nitrosoamines. `CH_(3)-underset((2^(@)" amine"))(NH-CH_(3))+HNO_(2)tounderset("demethyl nitrosoamine (oily)")(CH_(3)-overset(NO)overset(|)(N)-CH_(3)+H_(2)O)` |
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| 197. |
Major product (s) is/are? A. Only VB. II,IV and VIC. I, III and VD. No reaction takes place |
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Answer» Correct Answer - D `-NO_2` is a highly deactivating group and deactivates the benzene nucleus to such an extend that it does not undergo friedel-Crafts reaction if `-NO_2` group is present (i.e., in case of nitrobenzene.) |
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| 198. |
Which one of the following -compounds does not react with nitrous acid ? .A. `CH_(3)CH_(2)CH_(2)NO_(2)`B. `(CH_(3))_(2)CHCH_(2)NO_(2)`C. `(CH_(3))_(2)C-NO_(2)`D. `CH_(3)-underset(O)underset(||)(C )-underset(CH_(3))underset("| ")("C ")H-NO_(2)` |
| Answer» Correct Answer - C | |
| 199. |
Which of the following compounds is soluble in benzene but almost insoluble in water?A. `C_2H_5OH`B. `CH_3CO_2H`C. `CH_3CHO`D. `C_6H_5NO_2` |
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Answer» Correct Answer - D Nitrobenzene is insoluble in water but soluble in benzene, alcohol etc. |
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| 200. |
In the reaction of p-chlorotoluene with `KNH_(2)` is liguid `NH_(3)` the major product is .A. o-toluidineB. m-toluidineC. p-toluidineD. p-chloroaniline |
| Answer» Correct Answer - B | |