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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.
| 101. |
In which of the following moleucles, all atoms are coplanar?A. B. C. D. |
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Answer» Correct Answer - a |
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| 102. |
Which one of the following compounds will undergo meta substitution (mainly) on monochlorination?A. chlorobenzeneB. PhenolC. EthylbenzoateD. Ethoxyethane |
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Answer» Correct Answer - c |
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| 103. |
According to Huckl rule, the number of pi electrons in naphthanlene is:A. 6B. 10C. 14D. 16 |
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Answer» Correct Answer - b |
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| 104. |
Which of the following fraction obtained from coal tar yields anthracene and phenanthrene?A. Light oilB. Middle oilC. Heavy oilD. Green oil |
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Answer» Correct Answer - D Distillation of coal tar provides four volatile fractions as well as pitch that is used for surfacing roads and in the manufacture of asphalt roofing. |
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| 105. |
An aromatic molecule willA. `"have "4npi" electrons"`B. `"have "(4n+2)pi" electrons"`C. be planarD. be cyclec |
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Answer» Correct Answer - `(b,c,d)` |
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| 106. |
the General formula of arenes possessing only one benzene ring and no unsaturated side chain isA. `C_(n)H_(2n-6)`B. `C_(n)H_(2n-4)`C. `C_(n)H_(2n-2)`D. `C_(n)H_(2n)` |
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Answer» Correct Answer - 1 For benzene, `n=6` Thus, `C_(n)H_(2n-6)=C_(6)H_(12-6)=C_(6)H_(6)` |
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| 107. |
Which of the following is an arene?A. B. C. D. All of these |
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Answer» Correct Answer - 4 Aromatic hydrocarbons are usually known as arenes |
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| 108. |
Which of the following ions derived from`(1,3,5,7)`-cyclooctatetraene `(C_(8)H_(8))` by adding or removing a suitable number of `pi` electrons are aromatic? (i). `C_(8)H_(8)^(2-)` (ii). `C_(8)H_(8)^(+)` (iii). `C_(8)H_(8)^(2+)` (iv). `C_(8)H_(8)^(-)`A. (i),(iii)B. (ii),(iv)C. (ii),(iii),.(iv)D. (i),(ii),(iii) |
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Answer» Correct Answer - 1 `C_(8)H_(8)` has `8pie^(-)s(i.e.,4npie^(-)s)`. By adding `2e^(-)(10pie^(-)s)` or by removing `2e^(-)(6pie^(-)s)`, i.e., `(4n+2)pie^(-)s` it becomes aromatic. |
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| 109. |
Which of the followig is aromatic?A. `[18]`-annuleneB. `[16]`-annleneC. `[14]`-annuleneD. `[10]`-annulene |
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Answer» Correct Answer - 1 According to the Huckel rule, the `[14],[18]` and `[22]` annulenes `(4n+2` where `n=3,4,5`, respectively have been found to be aromatic `[12],[16] and [24]` annulenes are not aromatic. They are 4n compounds not `4n+2` compounds `[10]` annulenes are expected to be aromatic on the basis of `e^(-)` count, but they are not aromatic as their rings are not planar. |
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| 110. |
How will you obtain the following compounds from benzene ? (a) p-Beromobenzoic aicd (b) m-Chlorophenol ( c) 2-Phenyl ethanoic acid (d) 4-Methyl-l-n-propylbenzene ( e) O-chlorotuene (f) Phenyl ethyne (g) i-Ethyl-4-methylbenzene (h) 2-Methyl-5-nitrophenol (i) m-Nitrochlorobenzene (j) p-Nitrochlorobenzene (k) Benzyl alcohol (L) Phenol (m) m-Dichlorobenzene (n) 1,3,5-Trinitrobenzene (TNB) (o) p-Nitrobenzaldehyde. |
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Answer» Correct Answer - `(##GRB_ORG_CHM_P1_C08_E01_012_S01##)` `(##GRB_ORG_CHM_P1_C08_E01_012_S02##)` `(##GRB_ORG_CHM_P1_C08_E01_012_S03##)` `(##GRB_ORG_CHM_P1_C08_E01_012_S04##)` |
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| 111. |
What will be the end peoduct (B) ?A. 1,2-DibromobenzeneB. 1,3-DibromobenzeneC. 1,4-DibromobenzeneD. 1,2-Dibromobenzaldehyde |
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Answer» Correct Answer - b |
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| 112. |
Name each of the following substituted biphenyls : |
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Answer» Correct Answer - `(##GRB_ORG_CHM_P1_C08_E01_006_S01##)` |
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| 113. |
What combination of acyl chloride or acid anhydride and arene are choosen to prepare the following compounds ? |
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Answer» Correct Answer - `(##GRB_ORG_CHM_P1_C08_E01_005_S01##)` |
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| 114. |
The structure of compound that gives a tribromo derivative on treatment with bromine water :A. B. C. D. |
| Answer» Correct Answer - A | |
| 115. |
Which one of the following compounds will undergo meta substitution (mainly) on monochlorination?A. chlorobenzeneB. phenolC. ethyl benzoateD. ethoxybenzene |
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Answer» Correct Answer - C The `-Cl` of chlorobenzene is weakly deactivating but has ortho-para directing influence. The `-OH` group of phenol is strongly activating the `-OC_(2)H_(5)` group of ethoxybenzene is moderately activating but the `-overset(O)overset(||)(C)-OC_(2)H_(5) ` group of ethylbenzoate is moderately deactivating and exerts meta directing influence on account of `-I_("effect")` and `-R_("effect")` |
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| 116. |
The most common reaction of benzene isA. nucleophilic substitutionB. nucleophilic additionC. electrophilic additionD. electrophilic substitution |
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Answer» Correct Answer - D The most characteristic reaction of benzene are the substitution reactions that occur when it reacts with electrophilic reagents in these reactions there is more or less no loss of the resonance energy. |
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| 117. |
Conversion of benzene to acetopheone can be brought by :A. Wurtz reactionB. Wurtz-Fitting reactionC. Friedel-Crafts alkylationD. Friedel-Craft acylation |
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Answer» Correct Answer - d |
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| 118. |
The index of hydrogen deficiency (IHD) of benzene isA. 4B. 6C. 2D. 3 |
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Answer» Correct Answer - 4 Molecular formula of benzene is `C_(6)H_(6)` `IHD=sum(n(v-2))/(2)+1=(6(4-2)+6(1-2))/(2)+1` `=3+1=4` IHD for banzene is 4 due, to three `pi` bonds and one cyclic structure. |
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| 119. |
Which of the following compounds that can be most readily nitrated ?A. benzeneB. phenolC. tolueneD. nitrobenzene |
| Answer» Correct Answer - B | |
| 120. |
Among the following compounds that can be most readily nitrated is :A. benzeneB. benzaldehydeC. tolueneD. chlorobenzene |
| Answer» Correct Answer - A | |
| 121. |
Which one of the following compounds in not aromatic?A. B. C. D. |
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Answer» Correct Answer - C In compound (3) the lone pair on the N atom cannot be the part of delocalized `pie^(-)` cloud on accout of steric hindrance provided by `CH_(3)` group. |
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| 122. |
If aromatic ring is substitued by more than groups then electrophilic aromatic substitution reaction take place according to more activating group. Type of group which donate electron in aromatic ring known as activating group Major product formation take placed at which position in this reaction : A. 3B. 1C. 6D. 4 |
| Answer» Correct Answer - B | |
| 123. |
Which of the following statements is not correct?A. In the reaction between `HOCl` and `H^(+)` the electrophile is `Cl^(+)`B. In the reaction between Icl and `ZnCl_(2)` the electrophile is `Cl^(+)`C. In the reaction between HONO and `H^(+)`the electropnile is `NO^(+)`.D. |
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Answer» Correct Answer - 2 `2I-Cl+ZnCl_(2)to2I^(+)+ZnCl_(4)^(2-)` `I^(+)` is more stable than `Cl^(+)` |
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| 124. |
Match the following : |
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Answer» Correct Answer - `(a-p,r); (b-p,s); (c-p,r); (d-q,s)` |
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| 125. |
Match the following : |
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Answer» Correct Answer - `(a-r,s); (b-p,q,r); (c-p,q); (d-r,s)` |
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| 126. |
When phenol is treated with excess of bromine water, its gives :A. m-bromophenolB. o- and p-bromophenolC. 2, 4-disbromophenolD. 2, 4, 6- tribromophenol |
| Answer» Correct Answer - D | |
| 127. |
Which of the following compounds does not decolorize the red-brown color of a solution of bromine in carbon tetrachloride?A. B. C. D. |
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Answer» Correct Answer - 4 Due to resonance stabilizatiohn, benzene resists addition reaction.Thus, it does not give the test of unsaturation. |
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| 128. |
Which of the following is slightly soluble in water?A. 1,4-CyclohexadieneB. 1,3-CyclohexadieneC. BanzeneD. All are insoluble in water |
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Answer» Correct Answer - 3 The delocalized `e^(-)` s in benzene are more easily polarized, resulting in greater van der waals attractive forces in water. |
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| 129. |
Which of the followinghas the highest melting point?A. BenzeneB. 1,4-CyclohexadieneC. 1,3-CyclohexadieneD. 1,2-Cyclohexadiene |
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Answer» Correct Answer - 1 Benzene `(5.5^(@)C)` is a completely planar molecule and it can be more closely packed in the crystal. |
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| 130. |
When the three dibromobenzenes are mononitrated, the one melting at `87^@C` gives only one mononitro product, while those with melting points of `6^@C` and `-7^@C` give two and three mononitro derivatives, respectively. Which of the following statements is correct?A. The isomer melting at `87^@C` is para-dibromobenzne.B. The isomer meting at `6^@C` is ortho-dibromobenzene.C. The isomer meting at `-7^@C`D. None of these |
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Answer» Correct Answer - D These results led korner in 1875 to assign structures to the three isomeric dibromides. The only dibromide with four equivalent position for mononitration is para the dibromide with two equivalent position is ortho while the dibromide with three identical position is meta. |
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| 131. |
Select the correct statement about benzene:A. Benzene possesses two types of carbon-carbon bonds.B. Benzene usually undergoes addition reaction.C. Benzene produced three monosubstituted products.D. Benzene involves cyclic delocalization of six `pi` electrons. |
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Answer» Correct Answer - D All the six carbon-carbon bonds in benzene are equal benzene usually undergoes substitution reactions.Benzene gives just one monosubstitution product. |
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| 132. |
Which of the following statements is not compatible with arenes?A. Arenes usually have good thermodynamic stability.B. Arenes involve cyclic delocatlization of `(4n+2)pi` electrons.C. Arenes show resonanceD. Arenes usually undergo electrophilic addition at ring double bonds. |
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Answer» Correct Answer - D Arenes prefer to undergo electrophilic substitution reaction as in these reactions, the aromatic character is retained i.e., there is more or less no loss of resonance energy. |
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| 133. |
Benzene reacts with `CHCl_(3)` in the presence of arhydrous `AlCl_(3)` to formA. `(C_(6)H_(5))_(2)CHCl`B. `(C_(6)H_(5))_(3)CH`C. `C_(6)H_(5)CH_(2)C`D. `C_(6)H_(5)CHCl_(2)` |
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Answer» Correct Answer - 2 `3C_(6)H_(6)+CHCl_(3)overset(AlCl_(3))to(C_(6)H_(5))_(3)+3HCl` Triphenylmethane (tritane may also be prepared) by the following methods: `2C_(6)H_(6)+C_(6)H_(5)CHCl_(2)overset(AlCl_(3))to(C_(6)H_(5))_(3)CH+2HCl` `2C_(6)H_(6)+C_(6)H_(5)CHOoverset(ZnCl_(2))to(C_(6)H_(5))_(3)CH+H_(2)O` |
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| 134. |
Which of the following does not undergo the Friedel-Crafts alkylation reaction?A. AnilineB. NitrobenzeneC. AnisoleD. Both (1) and (2) |
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Answer» Correct Answer - 4 Aniline forms a complex with `AIX_(3)` through lone pair on nitrogen. `C_(6)H_(5)overset(delta)(N)H_(2)..overset(delta-)(Al)X_(3)` Nitro group is a strong deactivator, Thus the `e^(-)` density in nitrobenzne is to less to be attacked by an electrophile. |
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| 135. |
Nitrating agent for aromatic compound may be :A. `N_(2)O_(5)`B. `C_(2)H_(5)ONO_(2)`C. `NO_(2)CF_(3)SO_(3)`D. All of these |
| Answer» Correct Answer - D | |
| 136. |
+ CH_(3)- CH_(2)CH_(2)CH_(2)- Cloverset (AlCl_(3))to X,` Major product Xis :A. B. C. D. none of these |
| Answer» Correct Answer - D | |
| 137. |
Product of the given reaction : A. B. C. D. |
| Answer» Correct Answer - A | |
| 138. |
Compound A and B respectively are :A. o- bromo styrene, benzoic acidB. p- bromo styrene, benzaldehydeC. m- bromo styrene , benzaldehyeD. styrene dibromide, benzoic acid |
| Answer» Correct Answer - D | |
| 139. |
Identify the product obatined in the following reaction : A. B. C. D. |
| Answer» Correct Answer - A | |
| 140. |
Consider the reaction , Here A is :A. B. C. D. none of these |
| Answer» Correct Answer - A | |
| 141. |
In which of the following reaction tertiary butyl benzene is formed ?A. B. C. D. All of these |
| Answer» Correct Answer - B | |
| 142. |
The major product X is :A. B. C. D. none is correct |
| Answer» Correct Answer - D | |
| 143. |
Which of the following underges suluphonation fast ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 144. |
Point out incorrect statement about resonace.A. Resonance structure should have equal energy .B. In resonance structures, the constituent atoms should be in the same positionC. In resonance strutures should be the same number of electron pairs.D. Resonance structure should differ only in the location of electrons around the constituent atoms. |
| Answer» Correct Answer - A | |
| 145. |
Reactivity order of the following towards Na O Et, Et OH : A. `IIgtIgtIII`B. `IgtIIIgtII`C. `II gt III gtI `D. `III gt II gt I` |
| Answer» Correct Answer - D | |
| 146. |
The major product obatined in the reaction A. B. C. D. |
| Answer» Correct Answer - D | |
| 147. |
Benzene can be obatined by :A. `C_(6)H_(5)OH+ NaOHunderset(Delta)overset(CuO)to`B. `C_(6)H_(5)OH + Znoverset(Delta)to`C. `C_(6)H_(5) - N = N-Cl+ H_(2)O to `D. All of these |
| Answer» Correct Answer - B | |
| 148. |
Ozonolysis of the following compound will produce, A. B. C. D. |
| Answer» Correct Answer - A | |
| 149. |
Which of the following will be obatined by the bromination of ethylbenzene is presence of light ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 150. |
How many trinitrotoluenes are possible?A. SixB. SevenC. EightD. Five |
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Answer» Correct Answer - A There are six isomers: `2,3,4-TNT,2,3,5-TNT,2,3,6-TNT,2,4,5-TNT,2,3,6-TNT,3,4,5-TNT`. |
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