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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. |
Which of the following statement is /are correct ? An activating group is an electron releasing group 2. An activating group activate all position of benzene ring 3. The effect of any group whether activating or decativating is the strongest at ortho and para position in the benzene ring 4. An activating group activate only the ortho and para position in benzing ringA. 2,3B. 1,3,4C. 1,2,3D. 1,2,3,4 |
| Answer» Correct Answer - B | |
| 102. |
Which of the following group would enhance the reactivity of electrophile aromatic substiutionA. `-NO_(2)`B. `-CH_(3)`C. `-CN`D. `-CHO` |
| Answer» Correct Answer - B | |
| 103. |
Which can undergo haloform reaction ?A. `(CH_(3))_(3) C-OH`B. `(C_(2)H_(5))_(2)C=O`C. AcetophenoneD. Benzophenone |
| Answer» Correct Answer - C | |
| 104. |
`CH_(3)CH_(2)CHO +PCI_(5) to (B) ,(A) " and " (B) " are "`A. gem dihalideB. (A) gem dihlide (B) vic dihalideC. vic dihalidesD. (A) vic dihalide (B) gem dihalide |
| Answer» Correct Answer - D | |
| 105. |
The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol isA. anhyd. `AICI_(3)`B. `FeCI_(3)`C. anyl. `ZnCI_(2)`D. `Cu` |
| Answer» Correct Answer - C | |
| 106. |
What is AA. B. C. D. |
| Answer» Correct Answer - C | |
| 107. |
In the preparation of Griganrds reagent catalyst used is,A. `I_(2)`B. `Cl_(2)`C. `Br_(2)`D. `CaOCl_(2)` |
| Answer» Correct Answer - A | |
| 108. |
Griganrds reagent add to,A. `gtC=O`B. `-C-=N`C. `gtC=S`D. all of these |
| Answer» Correct Answer - D | |
| 109. |
Find out reagent in following conversion A. HI and HgOB. NalC. NaOID. `CHI_(3)` |
| Answer» Correct Answer - B | |
| 110. |
Following compund on alkline hydrolysis produced A. B. C. D. |
| Answer» Correct Answer - C | |
| 111. |
Following compund is reacted with `SbF_(3)` gives A. B. C. D. |
| Answer» Correct Answer - A | |
| 112. |
Compound A of formula `C_(8)H_(18)` forms mainly 3-chloro 2,2,3-tri methyl penetane on monohalogenation. The compund (A) isA. n-octaneB. 2-methyl heptaneC. 3-methyl heptaneD. 2,2,3-trimethyl penatane |
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Answer» Correct Answer - D Comounds (d) is `CH_(3)-underset(CH_(3)) underset(|) overset(CH_(3) ) overset(|)C-overset(CH_(3)) overset(|)(CH)-CH_(2)-CH_(3)` contaisn only on `3^(@)` on monohalogenation gives mainly `CH_(3)-underset(CH_(3)) underset(|) overset(CH_(3) ) overset(|)C-overset(CH_(3)) overset(|)(CX)-CH_(2)-CH_(3)` Ease of abstraction of hydrogen is `3^(@) gt 2^(@) gt 1^(@) H` |
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| 113. |
Which of the following compounds will give racemic mixture on nucleophillic substitution by `OH^(-)` ion? A. (i)B. (i),(ii),(iii)C. (ii),(iii)D. (i),(iii) |
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Answer» Correct Answer - A It is the correct answer. Only structure (i) has Br atom attached to chiral carbon and it will form racemic mixture. |
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| 114. |
Which of the following compounds will give racemic mixture on nucleophillic substitution by `OH^(-)` ion? A. (i)B. (i), (ii) and (iii)C. (ii) and (iii)D. (i) and (iii) |
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Answer» Correct Answer - A A mixture containing two enantiomers in equalimolar amount have zero optical rotation, as the rotation due to one isomer is cancelled by the rotation due to other isomer. Such a mixture is known as racemic mixture. All those compounds which follow `S_(N)2` mechanism during nucleophilic substitution reaction form racemic mixture. Order of reactivity of alkyl halides towards `S_(N)1`. and reactions as follows: Tertiary halide, secondary halide, primary halide, `CH_(3)`X For `S_(N)1` reaction Thus, `CH_(3)-underset(C_(2)H_(5))underset(|)overset(***)CH-Br` contains a chiral carbon and gives a racemic product. Hence, option (a) is correct |
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| 115. |
Define Racemic mixture |
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Answer» Racemic mixture : Equal portions of Enantiomers combined to form an optically inactive mixture . This mixture is called racemic mixture . 1) Here rotation due to one isomer will be exaclty cancelled by the rotation of due to other isomer . 2) The process of conversion of enantiomer into a racemic mixture is called as racemisation . Eg : (+)` Butan-underset("Enantiomers")(-2-ol + (-) Butan)2-ol to (pm) underset("Racemic mixture")(Butan-2-ol)` |
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| 116. |
What is the criteria for optical activity . Give two examples of chiral molecules . |
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Answer» Optical activity : The property of rotating the plane polarized light by a chemical substance is called optical activity . `to` If the plane polarised light rotates in clock wise direction then it is dextro rotatory [(+) (or) d-forms]. `to` If the plane polarised light rotates in anti-clock wise direction condition then it is laevo rotatory [(-) or l-form] . Crieteria for optical activity : 1) Chirality (or) dissymmetry is the necessary and sufficient condition for a molecule to show optical activity . Chirality : The object which are non-superimposable on their mirror images are said to be chiral and this property is known as chirality . 2) Asymmetry (absence of symmetry) of the molecule is responsible for the optical activity of organic compounds . Examples of chiral molecules : i) 2-Butanol (ii) 2-Chlorobutane iii) 2-Bromopropanic acid . |
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| 117. |
The reaction `" Alcohol " +HCl hArr " Alkyl halide " +H_(2)O` is reversible . For the completion of the reaction `".........."` is used.A. Anhydrous `ZnCI_(2)`B. Conc. `H_(2)SO_(4)`C. `CaCI_(2)`D. Excess of water |
| Answer» Correct Answer - 1 | |
| 118. |
The reaction `" Alcohol " +HCI hArr " Alkyl halide " +H_(2)O` is reversible . For the completion of the reaction `".........."` us used.A. anhydrous zinc chloride.B. concentration `H_(2)SO_(4)`C. excess of waterD. calcium chloride |
| Answer» Correct Answer - A | |
| 119. |
The alkyl halide is converted into an alcohol byA. eliminationB. dehydrohalgenationC. additionD. substitution |
| Answer» Correct Answer - D | |
| 120. |
An alkyl halide may be converted into an alcohol byA. additionB. substitutionC. dehydrohalgenationD. elimination |
| Answer» Correct Answer - B | |
| 121. |
The reaction Alcohol `+HCl hArr` lakyl halide `+H_(2)O` for completion of reaction is usedA. anhy `ZnCl_(2)`B. conc. `H_(2)SO_(4)`C. excess of waterD. `CaCl_(2)` |
| Answer» Correct Answer - A | |
| 122. |
1,2-dichloroethane is known asA. geminal dihalideB. vicinal dihalideC. haloformD. all of the above |
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Answer» Correct Answer - B `CH_(2)ClCH_(2)Cl` is 1,2 dischloro ethane is a vecinal dihalid. |
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| 123. |
Assertion: 1,2-dichloroethane is optically active. Reason: Meso compounds are optically active.A. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. if both assertion and reason are incorrect. |
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Answer» Correct Answer - D Correct assertion. 1,2-dichloroethane is optically inactive as it has no chiral carbon atom Correct reason. Meso compound are opticaly inactive. |
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| 124. |
Under what conditions can 2-methylpropene be converted into iso butyl bromide on reacting with HBr? |
| Answer» In the presence of organic peroxide. | |
| 125. |
Among the choices of alkyl bromide , the least reactive bromide in a `S_(N^(2))` reaction is :A. 2-bromo -2- methylbutaneB. 1-bromopentaneC. 1-bromo-3-methylbutaneD. 1-bromo-3-methylbutane |
| Answer» Correct Answer - A | |
| 126. |
which chlorine atom is more electronegative in the following ?A. `CH_(3)Cl`B. `CH_(3)CH_(2)Cl`C. `(CH_(3))_(2)CHCl`D. `CH_(3)CH_(2)-underset(Cl)underset(|)C-(CH_(3))_(2)` |
| Answer» Correct Answer - D | |
| 127. |
Which is the main product obtained when the following haloalkanes are treated with alcoholic KOH? (i). `CH_(3)CH_(2)CHICH_(3)` (ii). `CH_(3)CH_(2)C(CH_(3))_(2)Br` |
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Answer» (i). `CH_(3)-CH=CH-CH_(3)` (ii). `CH_(3)CH=C(CH_(3))_(2)`. |
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| 128. |
2-bromopentane is treated with alcoholic KOH solution the reaction respectively are :A. pent -1- ene, `beta-`elimiantionB. pent-2-ene `beta-`eliminationC. pentan-2-ene, nucleophilic substitutionD. pent-2-ene , nucleophilic substitution |
| Answer» Correct Answer - B | |
| 129. |
Which of the following products are expected from the solvolysis of bromomethyl cyclopentane ? A. B. C. D. |
| Answer» Correct Answer - (1,2,3,4) | |
| 130. |
Which one of the following chlorohydrocarbons readily undergoes solvolysis?A. `CH_2=CHCl`B. C. D. |
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Answer» Correct Answer - C Solvolysis is realted to stability of carbocation formed and among these benzyl carboncation is most stable. So, it will undergo solvoysis readily. |
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| 131. |
The order of rate of hydrolysis of alkyl halides `1^(@),2^(@),3^(@)` and `CH_(3)X` by the `S_(N^(2))` pathway is :A. `1^(@)gt 2^(@) gt 3^(@) gt CH_(3)X`B. `CH_(3)X gt 3^(@)gt2^(@) gt 1^(@)`C. `CH_(3)X gt 1^(@) gt 2^(@) gt 3^(@)`D. `3^(@) gt 2^(@) gt 1^(@) CH_(3) X` |
| Answer» Correct Answer - C | |
| 132. |
Which of the following alkyl halides will undergo `S_(N)1` reaction most redily ?A. `(CH_(3))_(3)C-F`B. `(CH_(3))_(3)C-Cl`C. `(CH_(3))_(3)C-Br`D. `(CH_(3))_(3)C-l` |
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Answer» Correct Answer - D It is the correct answer. All are tertiary alkyl halides but the cleavage of C-I bond is the easiest. |
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| 133. |
Tertiary butyl chloride preferably undergo hydrolysis by:A. `S_(N^(2))` mechanismB. `S_(N^(2))` mechanismC. any of (a) and (b)D. none of these |
| Answer» Correct Answer - A | |
| 134. |
Which of the following alkyl halides is hydrolysis by `S_(N^(2))` mechanism?A. `H_(2)C=CHCH_(2)Br`B. `(CH_(3))_(3) CBr`C. `CH_(3)Br`D. None of these |
| Answer» Correct Answer - C | |
| 135. |
The compound which does not undergo hydrolysis by `S_(N^(1))` mechanism is:A. `CH_(2)=CHCH_(2)Cl`B. `C_(6)H_(5)Cl`C. `C_(6)H_(5)CH_(2)Cl`D. `C_(6)H_(5)CH(CH_(3))Cl` |
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Answer» Correct Answer - B Chlorobenzene does not undergo hydrolysis by following `S_(N^(1))` mechanism. |
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| 136. |
Which isomer of `C_(4)H_(8)` produces same compoun with HBr in presence and absence of peroxide ?A. 1-butueneB. 2-buteneC. IsobutyleneD. Propene |
| Answer» Correct Answer - B | |
| 137. |
Symmetrical alkane can be prepared from alkyl halide by,A. Wurtzs reactionB. Cannizzaros reactionC. Hoffmanns reactionD. Mendius reaction |
| Answer» Correct Answer - A | |
| 138. |
Which of the following alkane is synthesised from single alkyl halide ?A. `(CH_(3))_(2)CH CH_(2)CH_(3)`B. `(CH_(3))_(2)CHCH_(3)`C. `(CH_(3))_(3)C-C(CH_(3))_(3)`D. `CH_(3)CH(CH_(3))CH_(2)CHCH_(3)` |
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Answer» Correct Answer - C Compound Cis prepard from t-butyl halide. (Wurtz reaction) |
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| 139. |
Purk alkyl bromide is formed from bromination of which alkane ?A. iso-butaneB. ethaneC. propaneD. 2-methyl butane |
| Answer» Correct Answer - B | |
| 140. |
which chloroderivative of benzene among the following would undergo hydrolysis most readily with aqueous NaOH to furnish the corresponding hydroxy compound?A. B. C. D. |
| Answer» Correct Answer - A | |
| 141. |
Which of the following reagents can be used to convert alkyl halide into alkane ?A. Action of Grignard reagentB. Action of `Bu_(3)SnH`C. Action of superacidD. Action of `K^(+)O^(-)C(CH_(3))` |
| Answer» Correct Answer - (1,2) | |
| 142. |
Which compound in following pairs will react faster in `S_(N) ^(2)` reaction with `-OH` ? `CH_(3) Br or CH_(3) I` |
| Answer» Among `CH_(3) Br` and `CH_(3)- I` reacts faster in `S_(N)^(2)` reaction with `OH^(Theta)` because bond dissociation energy of `C- I` is less than bond dissociation energy of `C - Br`. | |
| 143. |
Statement -1 : `S_(N)2` reaction of `CH_(3) -Br` faster in DMSO than in `H_(2)O` Statement -2 : DMSO has greater capability to solvate nucleophile |
| Answer» Correct Answer - C | |
| 144. |
Give the common nad IUPAC names for `C_(4)H_(9)Br` isomers and classify them as to whether they are `1^(@),2^(@) " or " 3^(@)` |
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Answer» The isomers of `C_(4)H_(9) Br` are the following with common and IUPAC names : `underset((1^(@)"Bromide"))underset("n-Butyl bromide")underset((1-"Bromobutane"))(CH_(3)CH_(2)CH_(2)CH_(2)Br)" "," "underset((2^(@)"Bromide"))underset("sec-Butyl bromide")underset((2-"Bromobutane"))(CH_(3)CH_(2)CHBrCH_(2))` `underset((1^(@)"Bromide"))underset("Isobutyl bromide")underset((1-"Bromo-2-methylpropane"))(CH_(3)-overset(CH_(3))overset(|)CH-CH_(2)Br)" "," "underset((3^(@)"Bromide"))underset("tert-Butyl bromide")underset((2-"Bromo-2-methylpropane"))(CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-Br)` |
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| 145. |
(a) Arrange alkyl halides water and alkane in order of decreasing density . (b) Arrange chloromethanes and water in order of decreasing density. (c) Arrange MeX in order of decreasing bond length. (d) Arrange MeX in order of decreasing bond strength. (e) Arrange MeX in order of activity. (f) Arrange alkyl halides `(1^(@),2^(@),3^(@))` in order of decreasing `S_(N^(2))` reactivity. (g) Arrange the order of reactivity of alcohols towards HX. (h) Arrange the decreasing order of reactivity in haloforms. (i) Arrange the following isomeric bromides in order of decreasing reactivity in `S_(N^(2))` displacement: `underset((I))("(b) 2-Bromo-2- methylbutane") ,underset((II))(1-"Bromopentane")`, `underset((III))(2-"Bromopentane")` `(C) underset((I))(1-"Bromo-3-methylbutane") ,underset((II))(2-"Bromo-2-methylbutane")` `underset((III))(2-"Bromo-3-methylbutane")` `(d) underset((I))(1-"Bromobutane") , underset((II))(1-"Bromo-2- methylbutane")` `underset(III)(1-"Bromo -3- methylbutane")` `underset((IV))(1-"Bromo-2,2-dimethylpropane")` |
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Answer» `(a) RI gt RBr gt H_(2)O gt RCI gt RF gt RH` `(b) C CI_(4) gt CHCI_(3) gt CH_(2)CI_(2) gt H_(2)O gt CH_(3)CI` `(C) MeI gt MeBr gt MeCI gt MeF` `(d) MeF gt MeCI gt MeBr gt MeI` `(E) MeI gt MeBr gt MeCI gt MeF` `(f) MeX gt RCH_(2) -X gt R_(2)CH -X gt R_(3)C -X` `(g) Allyl, benzyl gt 3^(@) gt 2^(@) gt 1^(@)` `(h) CHI_(3) gt CHBr_(3) gt CHCI_(3) gt CH_(3) F` `(i) (a) I gt IV gt III gt II " "(b)II gt III gt I` (C) `I gt III gt II" "(d) I gt III gt II gt IV` |
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| 146. |
In lactic acid, a methyl group, a hydroxy group, a carboxylic group are attached to a central carbon atom shows optical activity due to the molecular geometry atA. central carbon atomB. carbon atom of methyl groupC. carbon atom of the COOH groupD. oxygen atom of the hydroxyl group |
| Answer» Correct Answer - A | |
| 147. |
Which would undergo `S_(N^(2))` reaction faster in the following pair and why? `CH_(3)-CH_(2)-Br and CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Br`. |
| Answer» `CH_(3)-CH_(2)-Br` because it is a primary alkyl halide and offers less steric hindrance to the attacking nucleophile as compared to the other alkyl halide which is of tertiary nature. | |
| 148. |
How many isomers are possible for `C_(4)H_(8)F_(2)` and give their IUPAC names: |
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Answer» n-Butane can have two possible gendifluoro isomers: `underset("1,1-Difluorobutane")(F_(2)CHCH_(2)CH_(2)CH_(3)) " "underset("2,2-Difluorobutane")(CH_(3)CF_(2)CH_(2)CH_(3))` There are four isomers with two fluorine on different carbon atoms: `underset("1,2-Difluorobutane")(FCH_(2)CHFCH_(2)CH_(3))" "underset("2,2-Difluorobutane")(CH_(3)CHFCHFCH_(3))` `underset("1,3-Difluorobutane")(FCH_(2)CH_(2)CHFCH_(3)) " "underset(1,4-"Difluorobutane")(CH_(3)CHFCHFCH_(3))` The isobutane can have three possible difluoro isomers: `FCH_(2)-underset(CH_(3))underset(|)CF-CH_(3) F_(2)CH-underset(CH_(3))underset(|)CH-CH_(3) FCH_(2)-underset(CH_(3))underset(|)CH-CH_(2)F` `underset("propane(vic)")(1,2-"Difluoro-2-methlyl") " "underset("propane(gem)")(1,1-"Difluoro-2-methyl")" "underset("propane")(1,3-"Difluoro-2-methyl")` |
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| 149. |
(a). Why are alkyl halides insoluble in water? (b). Why is butan-1-ol optically inactive but butane-2 ol is optically active in nature? (c). Although chlorine is an electron withdrawing group yet it is ortho para directing in electrophilic aromatic substitution reaction. Why? |
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Answer» (a). Athough alkyl halides contain a polar `C-X` bond, they are not involved in any intermolecular hydrogen bonding with water. Therefore, these are water insoluble. (b). Butan-2-ol has a chiral carbon while it is absent in butan-1-ol. |
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| 150. |
Compound (S) that on hydrogenation product (S) optically inactive compound (s) `"is" //"are"`A. B. C. D. |
| Answer» Correct Answer - B::D | |