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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. |
The conversion of ethyl methyl ketoxime to N-methylpropanamide represents the example of which of the following type of the following type of organic reactionA. EliminationB. RearrangementC. SubstitutionD. Addition |
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Answer» Correct Answer - B The process refers to rearrangement reaction. |
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| 102. |
The hybridization state of carbon atoms in the product formed by the reactions of ethyl chloride with aqueous potassium hydroxide is .A. spB. `sp^(2)`C. `sp^(3)`D. `sp^(3)d` |
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Answer» Correct Answer - C `CH_(3)-CH_(2)-CI-underset(aq)(KOH)rarroverset(sp^(3))CH_(3)underset(Ethyl alcohol)overset(sp^(3))(CH_(2))-OH+KCI` |
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| 103. |
The rate law for the reaction `RCl + NaOH(aq) rarr ROH + NaCl` is given by Rate `= k[RCl]`. The rate of the reaction will beA. Doubled on doubling the concentration of alkyl halide to halfB. Halved on reducing the concentration of alkyl halide to halfC. Decreased on increasing the temperature of the reactionD. Unaffected by increasing the temperature of the reaction . |
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Answer» Correct Answer - B In `S_(N)1` Rate of reaction = `K_(1)[RC1]` Rate of reaction doubled on doubling concentration of halide |
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| 104. |
When a solution of NaCl containing `C_(2)H_(5)OH` is electrolysed it forms :A. `C Cl_(4)`B. `CHI_(3)`C. `CH_(2)Br_(2)`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - B Chloroform is manufactured by electrolysis of an aqueous solution of ethyl alcohol and sodium chloride. `NaCl(aq)rarr Na^(+)(aq)+Cl^(-)(aq)` `H_(2)O rarr H^(+)+OH^(-)` At cathode : `Na^(+)(aq)+e^(-)rarr Na(s), " " E_("red")^(@)=-2.71 V` `2H_(2)O+2e^(-)rarr H_(2)(g)+2OH^(-)(aq), " " E_("red")^(@)=-0.83 V` At cathode `H_(2)` gas is liuberated due to greater reduction potential of `H^(+)` than `Na^(+)`. At anode : `Cl^(-)rarr Cl+1e^(-)` `Cl+Cl rarr Cl , E_(oxd.)^(@)=-1.36 V` `H_(2)O(l)rarr 2H^(+)(aq)+1//2O_(2)(g), E_(oxd.)^(@)=-1.23 V` At anode `Cl_(2)` is liberated due to over voltage `C_(2)H_(5)OH+5Cl_(2)+H_(2)Orarr CHCl_(3)+CO_(2)+7HCl` |
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| 105. |
Which of the following reaction does not produce ethyne ?A. `CaC_(2)+H_(2)O rarr`B. `CHI_(3)+Ag rarr`C. `Al_(4)C_(3)+H_(2)O rarr`D. `C+H_(2)overset("Electric")underset(arc)rarr` |
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Answer» Correct Answer - C `Al_(4)C_(3)` is methanide carbide and hence produces `CH_(4)` with water. `Al_(4)C_(3)+12H_(2)O rarr 4Al(OH)_(3)+3CH_(4)` |
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| 106. |
Fire extinguisher Pyrene is :A. `CO_(2)`B. `C Cl_(4)`C. `CHCl_(3)`D. `H_(2)CO_(3)` |
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Answer» Correct Answer - B `C Cl_(4)` |
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| 107. |
A penta atomic organic compound has mol. mass 394. It also gave ethyne gas by reaction with silver powder. The compound can beA. `C Cl_(4)`B. `C Cl_(4)`C. `CHCl_(3)`D. `H_(2)CO_(3)` |
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Answer» Correct Answer - B `underset(("Powder"))(CHI_(3)+Ag+I_(3)HC)overset(Delta)underset(-6AgI)rarr underset("Ethyne")(HC-=CH)` Also Molecular mass `= 12+1+3xx127` `= 13+381 = 394.` |
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| 108. |
On warming with silver powder, chloroform is converted intoA. acetyleneB. hexachloroethaneC. ethyleneD. carbon |
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Answer» Correct Answer - A `CHCl_(3)+6Ag+CHCl_(3) overset(Delta)rarr HC-=CH+6AgCl` |
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| 109. |
DDT is formed fromA. Benzene and ChlorobenzeneB. Chloral and ChlorobenzeneC. Chloral and BenzeneD. Chlorobenzene and chlorine. |
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Answer» Correct Answer - B D.D.T. is prepared by reaction of chloral and chlorobenzene |
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| 110. |
The main organic product of the reaction `CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-OH overset(KBr//H_(2)SO_(4)("conc."))rarr` isA. tert-Butyl bromideB. Isobutyl bromideC. 2-MethylbutaneD. None of these |
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Answer» Correct Answer - C `2^(@)` or `3^(@)` alcohols in the presence of conc. `H_(2)SO_(4)` readily undergo elimination. `CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-OH overset(KBr//H_(2)SO_(4)(conc.))underset(-H_(2)O)rarr underset("2-Methylbutene")(CH_(3)-overset(CH_(3))overset("| ")("C ")=CH_(2))` |
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| 111. |
Which represents nucleophilic aromatic substitution reaction ?A. Reaction of benzene with `Cl_(2)` in sunlightB. Benzyl bromide hydrolysis with waterC. Reaction of NaOH with dinitrofluoro benzeneD. Sulphonation of benzene |
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Answer» Correct Answer - C Two nitro groups make the nucleophilic substitution in benzene easy. |
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| 112. |
Two percent of ethanol is added during the oxidation of chloroform to stop the formation of carbonyl chloride In this reaction ethanol acts asA. Auto catalystB. Negative catalystC. Positive catalystD. None of these |
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Answer» Correct Answer - B Any substance which when added to a chemical reaction inhibit or decrease the rate of reaction is called negative catalyst In `CHCI_(3)` when two percent ethano1 is added it negative catalyst . |
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| 113. |
` ( R )` -2-Iodobutane is treated with Nal in acetone and allowed to staned to stand for a long time The product eventually fromed is .A. `(R )`-2-idobutaneB. `(S )`-2-idobutaneC. `(+- )`-2-idobutaneD. `(+- )-`2-idobutane |
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Answer» Correct Answer - B 2-Iodobutane is `2^(@) RX` in polar aprotic solvent such as acetone it proceeds via `S_(N)2` thus inversion of configuration takes place . |
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| 114. |
Chloroform when kept open is oxidised to substitition reaction ?A. `O_(2)`B. `COCI_(2), HCI`C. `O_(2),C_(2)`D. none of the |
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Answer» Correct Answer - B Chloroform is oxidised to a poisonous gas phosgene `(COCI_(2))` by atmospheric gas `CHCI_(3)+OrarrCOCI_(2)+HCI` . |
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| 115. |
preparation of alkyl halides in laboratory is lest preferred by .A. Treatment of alcoholsB. Addition of hydrogen halides to alkenes .C. Halide exchangeD. Direct halogenation of alkanes . |
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Answer» Correct Answer - B Because it from more than one product |
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| 116. |
In the Hunsdiecker reaction .A. Number of carbon atoms decreaseB. Number of carbon atoms increaseC. Number of carbon atoms remain sameD. none of the above |
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Answer» Correct Answer - A In the Hunsdiecker reaction rarr `CH_(3) CH_(2) COOAg + Br_(2) overset(C C1_(4))rarrCH_(3) CH_(2) Br+CO_(2) +NaBr` `Silver Propionate (No of C =3) Ethyl Bromide (No of C =2) No of carbon Atoms decrease Therefor option a is correct . |
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| 117. |
`R-OX + HX to R -X + H_(2)O` In the above reaction the reactivity of different alcohols isA. Tertiary >Secondary>PrimaryB. TertiaryC. Tertiary gtSecondarygtPrimaryD. Secondary gtPrimaryltTertiary |
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Answer» Correct Answer - A `R -OH + HX arra R -X + H_(2) O` Reactivity order of alcohols for this reaction `3^(@) gt 2^(@) gt 1^(@)` Reactivity order of halogen acids `R -I gt R -Br gt R -CI` . |
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| 118. |
Ethyl carbocation can be considered as hybrid of the following four structures The phenomenon associated with above type of the resonance isA. HyperconjugationB. Heterovalent resonanceC. ConjugationD. Isomerism |
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Answer» Correct Answer - A The phenomenon refers to no-bond resonance or hyperconjugation. It explains the stability of carbocations and free radicals. |
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| 119. |
`BeC_(2)+H_(2)O rarr` The products of above reaction are :A. `Be(OH)_(2)` and `CO_(2)`B. `Be(OH)_(2)` and `CH_(4)`C. `Be(OH)_(2)` and `H_(2)C=CH_(2)`D. `Be(OH)_(2)` and `HC-=CH` |
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Answer» Correct Answer - B `BeC_(2)+H_(2)O rarr Be(OH)_(2)+CH_(4)` |
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| 120. |
Chlorination of toluene in the presence of light and heat followed by treatment with aqueous `NaOH` givesA. o-cresolB. p-cresolC. mixture of o-cresol and p-cresolD. benzoic acid |
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Answer» Correct Answer - D `underset("Toluene")(C_(6)H_(5)CH_(3))overset(Cl_(2)("excess"))underset("light, heat")rarrunderset("Benzotrichloride")(C_(6)H_(5)C Cl_(3))overset(NaOH(aq))underset(-3NaCl,H_(2)O)rarrunderset("Benzoic acid")(C_(6)H_(5)COOH)` |
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| 121. |
How many stereoisomerse does this molecule has? `CH_(3)CH=CHCH_(2)CHBrCH_(3)`A. 8B. 2C. 5D. 6 |
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Answer» Correct Answer - C `CH_(3)CH=CHCH_(2)overset(**)(C )HBrCH_(3)` is an alkene having different substituents at each carbon atom of the doble bond. So it exists in two geometrical isomers i.e., cis and trans. Since the given compounds also has a chiral centre, therefore, each geometrical isomer has a pair enantiomers. Thus in all, there asre `2xx2=4` stereoisomers. |
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| 122. |
Wthylene dichloride and ethylide dichloreide yield same product withA. Zn dustB. Alcoholic KOHC. Aqueous KOHD. None of these |
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Answer» Correct Answer - B Alcoholic KOH yield ethyne on reaction with both ethylene dichloride and ethylidene dichloride. |
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| 123. |
Carbon atom holding halogen in aryl halides isA. `sp^(2)`-hybridisedB. `sp^(3)`-hybridisedC. sp-hybridisedD. `sp^(3)d`-hybridised. |
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Answer» Correct Answer - A `sp^(2)`-hybridised. |
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| 124. |
Which of the following compounds have isopropyl groupA. 2,2,3,3-tetramethyl pentaneB. 2,2-dimethyl butaneC. 2,2,3-trimethylD. 2-methyl pentane |
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Answer» Correct Answer - D Isopropyl group is `CH_(3)-CH-CH_(3)` On writing structures for various options we get the following out of which (D) has isopropyl group (A) `CH_(3)-CH_(3)C_(2)-Cl-ClCH_(3)` (B) `CH_(3)CH_(2)CH_(2)-C-CH_(3)` (C ) `CH_(3)-CH_(2)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")H-C-CH_(3)` (D) `CH_(3)-CH_(2)-CH_(2)-CH-CH_(3)` |
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| 125. |
Which of the following reagents can be used to prepare an alkyl halide from an alcohol?A. HCl + anhyd. `ZnCl_(2)`B. NaClC. `PCl_(5)`D. `SOCl_(2)` |
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Answer» Correct Answer - B NaCl cannot be used for the preparation of alkyl chlorides from alcohols. |
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| 126. |
When chlorine is passed through warm benzene in presence of the sunlight the product obtained is .A. BenzotrichlorideB. ChlorobenzeneC. GammexaneD. DDT |
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Answer» Correct Answer - C Gammaxane |
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| 127. |
For the preparation of ethyl propionate from ethyl bromide, the order reactnat can beA. silver acetateB. propionic anhydrideC. propanoyl chlorideD. silver propionate |
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Answer» Correct Answer - D `H_(3)C-CH_(2)-CH_(2)-Br+Ag-underset("Silver propionate")(O-overset(O)overset(||)(C )-CH_(2)-CH_(3))underset(-AgBr)rarr underset("Ethyl propionate")(H_(3)C-CH_(2)-O-overset(O)overset(||)(C )-CH_(2)-CH_(3))` |
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| 128. |
For the preparation of chloroethane,A. HCl gas is passed through ethanol in the presence of anhydrous `ZnCl_(2)`B. ethanol is trated with sodium chloride in the presence of dimethylamineC. ethyl sulphide is treated with hydrogen chlorideD. Any of the above methode can be employed |
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Answer» Correct Answer - A `C_(2)H_(5)OH+HCl(g) overset("Anhyd." ZnCl_(2))rarr H_(2)O+C_(2)H_(5)Cl` |
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| 129. |
Alkyl halides can be obtained by all methods exceptA. `CH_(3)CH_(2)OH+HCl//ZnCl_(2)rarr`B. `CH_(3)-CH_(2)-CH_(3)+Cl_(2)overset("U.V.light")rarr`C. `C_(2)H_(5)OH+NACl rarr`D. `CH_(3)COOAg+Br_(2)//C Cl_(4)rarr` |
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Answer» Correct Answer - C `C_(2)H_(5)OH+NaCl` can not react to give alkyl halide. |
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| 130. |
Which of the following alkyl halides has the maximum density ?A. `C_(2)H_(5)Cl`B. `C_(2)H_(5)Br`C. `C_(2)H_(5)I`D. `C_(2)H_(5)F` |
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Answer» Correct Answer - C Density of alkyl halides is in the order `R-I gt R-Br gt R-Cl gt R-F` depending on their molecular masses. |
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| 131. |
Which of the following shows `S_(N^(1))` reaction most readily ?A. B. C. D. |
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Answer» Correct Answer - B `3^(@)` Alkyl halides are most prove to `S_(N^(1))` reactions Hence (B) is correct. |
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| 132. |
One among the following compounds is most likely to produce potassium carbonate on warming with potassium hydroxideA. DichloromethaneB. TetrachloromethaneC. ChloroformD. None of these |
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Answer» Correct Answer - B `C Cl_(4)+4KOH underset(-4KCl)rarr underset("Unstable")(HO-overset(OH)overset("| ")underset(OH)underset("| ")("C ")-OH)overset(-2H_(2)O)rarr CO_(2)overset(2KOH)underset(-H_(2)O)rarr K_(2)CO_(3)` |
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| 133. |
Which of the following halide is most reactive towards Nucleophilic substitution reactions ?A. `C_(2)H_(5)Br`B. `C_(2)H_(5)Cl`C. `C_(2)H_(5)F`D. `C_(2)H_(5)I` |
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Answer» Correct Answer - D `C_(2)H_(5)I`, due to smaller value of bond dissociation energy. |
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| 134. |
Which of the following reactants will yield ethane ?A. Methyl bromine and sodiumB. Ethyl bromide and MgC. Ethanol and `H_(2)SO_(4)`D. Ethyl bromide and KCN |
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Answer» Correct Answer - A `H_(3)C-Br+2Na+BrCH_(3)overset("Dry ether")rarr2NaBr+ underset("Ethane")(H_(3)C-CH_(3))` |
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| 135. |
The halogen that best delocalizes the electron density to the benzene ring isA. FB. ClC. BrD. I |
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Answer» Correct Answer - A The smaller the size of the halogen, shorter is the C-X bond. Shorter bonds have more effective overlap of p-orbiitals, (extended `pi`-bonding) and therefore more extensive delocalisation. |
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| 136. |
Which alkyl halide has maximum density ?A. `C_(3)H_(7)I`B. `C_(2)H_(5)I`C. `CH_(3)I`D. `CH_(3)Br` |
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Answer» Correct Answer - C `CH_(3)I` has maximum density due to lowest carbon content and heavy halogen atom. |
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| 137. |
Which one of the following is not the correct order of boiling points of alkyl `//` aryl halides ?A. `CHCl_(3)gt CH_(2)Cl_(2)`B. `CH_(3)(CH_(2))_(3)Cl gt CH_(3)(CH_(2))_(2)Cl`C. `(CH_(3))_(3)C Cl gt (CH_(3))_(2)CHCH_(2)Cl`D. `CH_(3)(CH_(2))_(3)Cl gt CH_(3)CH_(3)CH_(2)CHClCH_(3)` |
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Answer» Correct Answer - C As the number of halogens increases, boiling point increases. Further, boiling points decrease with braching. Hence (C ) is correct. |
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| 138. |
Among the halogen derivatives of ethane, the one which has the highest boiling point isA. `C_(2)H_(5)F`B. `C_(2)H_(5)Cl`C. `C_(2)H_(5)Br`D. `CH_(3)Br` |
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Answer» Correct Answer - D `C_(2)H_(5)I` |
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| 139. |
Assertion: n- Buty chloride has higher boiling point than n-butyl bromide Reason `C-CI` bond is more polar than `C-Br` bond .A. If both assertion and reason are true and the reasone 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 reasone is falseD. If assertion is false but reason is true . |
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Answer» Correct Answer - D Correct Assertion Butyl bromide has higher boiling point than n-butyl chloride . |
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| 140. |
Which of the following compounds has the highest boiling point ?A. `CH_(3)CH_(2)CH_(2)Cl`B. `CH_(3)CH_(2)CH_(2)CH_(2)Cl`C. `CH_(3)CH(CH_(3))CH_(2)Cl`D. `(CH_(3))_(3)C Cl` |
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Answer» Correct Answer - B For isomeric halides, b.p decreases with braching. Hence `CH_(3)CH_(2)CH_(2)CH_(2)Cl` has the highest b.p. |
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| 141. |
Which of the following has the highest nucleophilicity ?A. `F^(-)`B. `OH^(-)`C. `CH_(3)`D. `NH_(2)^(-)` |
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Answer» Correct Answer - C As the electronegativity of the donor atom decreases, its tendency to donate a lone pair increases i.e., nucleophilicity increases. Order of electronegativity of F, O, N, C is : C lt N lt O lt F The least electronegative is carbon, as such `CH_(3)^(-)` is the strongest nucleophile. |
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| 142. |
D.D.T. isA. An insecticideB. Bleaching agentC. HypnoticD. Oxidising agent |
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Answer» Correct Answer - A Insecticide. |
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| 143. |
Reaction of ethyl chloride with sodium leads toA. EthaneB. PropaneC. n-butaneD. n-pentane |
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Answer» Correct Answer - C `C_(2) H_(5)CI+2Na+CIC_(2)H_(5)underset(Ether)overset(Dry)rarrC_(2) H_(5) -underset("n -butane")(C_(2)H_(5)+2NaCI ` . |
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| 144. |
`2CHCI_(3) +O_(2) overset(X)rarr2COCI_(2) + 2HCI` in the above reaction `X` stands for .A. An oxidantB. A reductantC. Light and airD. None of these |
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Answer» Correct Answer - C `2CHCI_(3) +O_(2) underset(air)overset(Light)rarr underset("Phosgene")(2COCI_(2)+2HCI)` |
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| 145. |
Phosgene is the common name forA. `CO_(2)`and`PH_(3)`B. PhosphorylchlorideC. CarbonylchlorideD. Carbon tetrachloride |
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Answer» Correct Answer - C `COCI_(2)` carbonyl chloride is commonly called as phosgene . |
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| 146. |
Which of the following statements about chloroform is false?A. It is a colourless sweent-smelling liquidB. Is is almost insoluble in waterC. It is highly inflammableD. It can be used an as inhalational anaesthetic agent |
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Answer» Correct Answer - C It is non-flammable . |
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| 147. |
The dehydrobromination of 2bromobutane give `CH_(3) CH=CHCH_(3)` The product is .A. Hofmann productB. Saytzeff productC. Hoffmann-Saytzeff productD. Markownikoff product |
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Answer» Correct Answer - B `CH_(3) -underset(Br)underset(|)CH-CH_(2) -CH_(3) + underset((alc))KOH overset("Saytzeffs rule")rarr` `CH_(3) -CH=CH-CH_(3) +KBr +H_(2)O` . |
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| 148. |
Lactic acid loses optical activity when reduced with red P and HI becauseA. chirality of the molecule is destroyedB. symmetry of the molecule is destroyedC. spatial arrangement is changedD. racemic mixture is changed |
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Answer» Correct Answer - A The molecule on longer remains chiral. `CH_(3)CH(OH)COOH overset(HI//P)rarr underset("Propane")(CH_(3)CH_(2)CH_(3))` |
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| 149. |
Acetone is mixed with bleaching powder to giveA. chloroformB. AcetaldehydeC. ethano1D. phosgene |
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Answer» Correct Answer - A Acetone forms chloroform when heated with bleaching powder `CaOCI_(2)+H_(2)OrarrCa(OH)_(2)+CI_(2)` `CH_(3)COCH_(3)+3CI_(2)rarrC CI_(3)COCH_(3)+3HCI` `2C CI_(3)COCH_(3)+Ca(OH)_(2)rarr underset("chloroform")(2CHCI_(3))+(CH_(3)COO)_(2)Ca` . |
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| 150. |
The IUPAC name of `C_(6)H_(5)-C-=N` isA. CyanobenzeneB. Phenyl cyanideC. Phenyl nitrileD. Benzenenitrile |
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Answer» Correct Answer - D `underset("Benzene nitrile")(C_(6)H_(5)-C-=N)` |
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