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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.
| 501. |
Benzene undergoes …………. (A) only addition reaction (B) only substitution reaction (C) both addition and substitution reactions (D) nucleophilic substitution reactions |
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Answer» Correct option is: (C) both addition and substitution reactions Benzene undergoes both addition and substitution reactions. (C) both addition and substitution reactions |
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| 502. |
The following reaction is an example of `H-underset("Ethanol")(underset(H)underset(|)overset(H)overset(| beta)(C)-underset(OH)underset(|)overset(H)overset(| alpha)(C))-Hunderset(Delta)overset(Conc. H_(2)SO_(4))rarr underset("Ethene")(CH_(2)==)CH_(2)+H_(2)O`A. oxidation reactionB. reduction reactionC. `alpha`- eliminaiton reactionD. `beta`-elimination reaction |
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Answer» Correct Answer - D This reaction is the example of `beta`-elimination reaction since-OH group takes out one hydrogen atom from the `beta`-carbon atom. |
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| 503. |
The relative stability of the compounds `underset(I)(CH_(3)-overset(CH_(3))overset(|)(C)=overset(CH_(3))overset(|)(C)-CH_(3))` `underset(I)(CH_(3)-overset(CH_(3))overset(|)(C)=CH-CH_(3))` `underset(IV)(CH_(2)=CH_(2))` is in the order-A. I`gt`II`gt`IIIB. II`gt`III`gt`IC. I`gt`III`gt`IID. II`gt`I`gt`III |
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Answer» Correct Answer - A More the `alpha-H` more will be stability |
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| 504. |
Choose the odd one out (a) Orlon (b) Neoprene rubber (c) PVC (d) PET |
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Answer» (d) PET. It is prepared by the polymerisation of glycol and terephthalic acid, whereas others are prepared from acetylene. |
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| 505. |
Acetylene trimerises to give benzene. The reaction occurs in the presence ofA. IronB. SilicaC. `(C_(6)H_(5))_(3)+Ni(CO)_(4)`D. `Cr_(2)O_(3)+p_(2)o_(5)` |
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Answer» Correct Answer - c When ethyne is passed through a red hot iron tube, benzene is formed. This reaction was first discovered in 1870. When this reaction is carried out in the presence of nickel carbonyl and triphenyl phosphene in benzene solution . `90%` yield is obtained. |
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| 506. |
Propylene is more stable than ethylene. The reason for this is the-A. Electrometic effectB. Hyper conjugationC. Inductive effectD. Resonance effect |
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Answer» Correct Answer - B Propene have `3alpha`-H while ethylene does not |
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| 507. |
Which one of the following has the minimum boiling point?A. n-ButaneB. IsobutaneC. 1-ButeneD. 1-Butyne |
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Answer» Correct Answer - B Boiling points follow the order Alkyne gt alkene gt n-alkane gt branched alkane. |
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| 508. |
Write the reagents involved in the following conversions.i. CH3 - CH2 - BR + 2[H] \(\overset{?}\longrightarrow\) 2CH3 - CH3 + HBrii. CH3 - Mg - I + H - OH \(\overset{?}\longrightarrow\) CH3 - H + MgI(OH) |
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Answer» i. CH3 - CH2 - BR + 2[H] \(\overset{Zn,HCI}\longrightarrow\) 2CH3 - CH3 + HBr ii. CH3 - Mg - I + H - OH \(\overset{Dry\,either}\longrightarrow\) CH3 - H + MgI(OH) |
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| 509. |
Methyl bromide when heated with zinc in a closed tube producesA. methaneB. ethaneC. ethyneD. methaol |
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Answer» Correct Answer - B This is a Wurtz type reaction. Instead of sodium, other metals such as Ag,Cu,Zn can also be used in finely divided state. |
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| 510. |
An example of chlorinolysis isA. `CH_(2)=CH_(2) overset(Cl_(2))to C_(2)H_(4)Cl_(2)`B. `C Cl_(4)+H_(2)O to COCl_(2)+2HCl`C. `CHCl_(3)+4NaOH to HCOONa+3NaCl+2H_(2)O`D. `C_(3)H_(8) overset(+9Cl_(2))to C Cl_(4)+C_(2)Cl_(6)+8HCl` |
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Answer» Correct Answer - D Chlorinolysis is breaking C-C bond by chlorine |
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| 511. |
The hydrogen atoms attached to carbon atoms joined directly to a benzen ring are calledA. benzyl hydrogensB. benzyl hydrogensC. benzylic hydogensD. benzotic hydrogens |
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Answer» Correct Answer - D The hydrogen atoms joined directly to a benzene ring are called benzotic hydrogens. |
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| 512. |
Which of the following order is correct for the decreasing reactivity to ring monobromination of the following compounds? A. ` I gt II gt III gt IV`B. `I gt III gt II gt IV`C. `II gt III gt IV gt I`D. `III gt I gt III gt IV` |
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Answer» Correct Answer - B Bromination of arenes is an electrophilic substitution reaction. The higher the electron density on the benzene ring, more is the ease with which the ring undergoes substitution. The presence of +R effect increases the reactivity while -R effect decreases it `NO_(2)` is more deactivating than `-COOH` since N is +vely charged and withdraws more electrons form benzene than `-COOH` |
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| 513. |
Methane can be converted into ethane by the reactionsA. chlorination followed by the reaction with alcoholic KOHB. chlorination followed by the reaction with aqueous KOHC. chlorination followed by Wurtz reactionD. chlorination followed by decarboxylation |
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Answer» Correct Answer - C `CH_4 overset(Cl_2)to CH_3Cl underset"(Wurtz reaction)"overset(Na, Delta)to underset"Ethane"(CH_3-CH_3)` |
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| 514. |
The maximum ease of abstraction of a hydrogen atom by a chlorine atom is shown byA. `(CH_(3))_(3)C-CH_(3)`B. `(CH_(3))_(2)CH_(2)`C. `C_(6)H_(5)CH_(3)`D. `CH_(2)=CHCH_(3)` |
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Answer» Correct Answer - c c |
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| 515. |
Despite their - I effect, halogens are o- and p-directing in haloarenes. Explain. |
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Answer» Halogens attached to benzene rings exert – I and +R effect. +R effect dominates – I effect and increases the electron density at ortho and para positions of the benzene ring with respect to halogens. |
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| 516. |
Which of the following is fier dampA. EthaneB. EthyneC. MethaneD. Propane. |
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Answer» Correct Answer - C Methane explodes violently when mixed with air or oxygen andignitted and this is belived to be the cause of exposions in coal mine where methane is known as fire damp. |
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| 517. |
Which of the following hydrocarbons is obtained whien 1, 1-ddibromopropane is treated with sodium in ether solution?A. PropeneB. PropaneC. PropyneD. Hex-3-ene |
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Answer» Correct Answer - D `2CH_(3)CH_(2)-underst(Br)underset(|)(CH)-Br underset("ether")overset("Na)to CH_(3)CH_(2)CH=CHCH_(2)CH_(3)` It is an extension of the Wurtz synthesis. Use of Na tends to produce lengthening of the carbon chain. |
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| 518. |
Aromatic hydrocarbons undergoA. Nucleophilic addition reactionsB. Electrophilic addition reactionsC. Electrophilic substituion reactionsD. All of these. |
| Answer» Correct Answer - C | |
| 519. |
Alkanes can be iodinated in the presence ofA. HIB. `I_(2)` and PC. `I_(2)+HIO_(3)`D. `Pl_(3)` |
| Answer» Correct Answer - C | |
| 520. |
Arrangte the following hydrocarbons in the increasing order of enthalpy of combustion. |
| Answer» Correct Answer - `IIltIltIIIltIV` | |
| 521. |
In the following reaction, `Z` is identifies as `CH-= Choverset(Z)rarr CH_(3)CHO`A. concentrated `H_(2)SO_(4)`B. `CH_(3)COCl`C. `20%H_(2)SO_(4)`D. `CH_(3)OH` |
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Answer» Correct Answer - c `C_(2)H_(2)overset(HgSO_(4) // H_(2)SO_(4))underset(H_(2)O)rarrCH_(3)SO_(4)` So,`Z` is `20% H_(2)SO_(4)+HgSO_(4)` |
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| 522. |
Wurtz reaction is used to unitA. two alkyl halidesB. two aryl halidesC. alkyl and aryl halidesD. two benzene units. |
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Answer» Correct Answer - A Wurtz reaction is used in preparing hydrocarbons by taking two alkyl halides. |
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| 523. |
The ozonolysis product isA. B. C. D. |
| Answer» Correct Answer - B | |
| 524. |
Name the following :The hydrocarbon said to possess carcinogenic property. |
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Answer» Benzene. Benzene is the hydrocarbon said to possess carcinogenic property. |
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| 525. |
Name the following :Alkene used in the manufacture of polythene bags. |
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Answer» Ethene. Alkene used in the manufacture of polythene bags is Ethene. |
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| 526. |
Which of the following methods is most appropriate for the manufacture of methane?A. By reduction of `CH_(2)Cl_(2)`B. Wurtz reactionC. Liqueficaiton of natural gasD. None of these |
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Answer» Correct Answer - C Natural gas is a cheap source of methane. |
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| 527. |
Two organic compound A and B both containing only carbon and hydrogen, on quanctities analysis gave the same percentage composition by weight: `C=(12//13)xx100%, H=(1//3)xx100%` A decoulourises bromine water but B does not. A and B respectively areA. `C_(2)H_(2) and C_(6)H_(6)`B. `C_(6)H_(6)and C_(2)H_(6)`C. `C_(2)H_(4) and C_(2)H_(6)`D. `C_(2)H_(4) and C_(2)H_(6)` |
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Answer» Correct Answer - A E.f. of hydrogcarbo=CH A is `C_(2)H_(2) and B is C_(6)H_(6)` `underset("Acetylene")(HC)=CH+2Br to CHBr_(2)-CHBr_(2)` `underset("Benzene")(C_(6)H_(6))+Br_(2) to "No reaction"` |
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| 528. |
Which of the following has highest octane number?A. n-HexaneB. n-heptaneC. n-PentaneD. 2,2,4-Trimethylpentane |
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Answer» Correct Answer - D For alkanes shorther chain length, more branching more than octane number |
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| 529. |
The chemical system that is non-aromatic isA. B. C. D. |
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Answer» Correct Answer - C Compound (c ) has no `pi`-electrons and hence is not aromatic. Further, compound shown in option (d) is called azulene in which both the rings have six `pi`-electrons and hence it is an aromatic compound. So are benzene (a) and naphthalene (b). |
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| 530. |
The chemical system that is non`-` aromatic isA. B. C. D. |
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Answer» Correct Answer - C Compound `(c)` has no `p` electrons and hence is not aromati. Option `(d)` is azulene in which both the rings have six `p` electrons and hence azulene is an aromatic compound Option `(a)` benzene and option `(b)` napthalene are also aromatic. |
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| 531. |
Compound `X` of molecular formula `C_(4)H_(6)` takes up one equivalent of hydrogen in presence of `Pt` to form another compound `Y` which on ozonolysis gives only ethanoic acid. The compound `X` can beA. `CH_(2)=CH-CH=CH_(2)`B. `CH_(2)=C=CHCH_(3)`C. `CH_(3)C-=C CH_(3)`D. All the three |
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Answer» Correct Answer - d Formation of only `CH_(3)COOH` by ozonolysis indicates that the compound `Y` should be `CH_(3)CH=CHCH_(3)` which can be formed by all the three given compounds. `underset(X)(CH_(3)=CH-CH=CH_(2))overset(1H_(2) // Pt) rarr underset(Y)(CH_(3)-CH=CH-CH_(3))` `underset(X)(CH_(3)C-= C CH_(3))overset(1H_(2) // Pt)rarr underset(Y)(CH_(3)CH= CH_(3)CH_(3))` `underset(X)(CH_(2)=C=CHCH_(3))overset(1H_(2) // Pt)rarr` `underset(Y)(CH_(3)CH=CHCH_(3))overset(O_(3))rarr 2CH_(3)COOH` |
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| 532. |
Cold and dil. `KMnO_(4)` reacts with but-2-ene to formA. ethane-1, 2-diolB. butane-1, 4-diolC. butane-1, 3-diolD. butane-2, 3-diol |
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Answer» Correct Answer - D Hydroxylation ocuurs `CH_(3)-CH=CH-underset(darr 298.303 k)(CH_(3)) + KMnO_(4)+H_(2)O` `CH_(3)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3)+MnO_(2)+KOH` |
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| 533. |
Addition of HBr to 2-methyl1-prop-1ene in the presence of hydrogen peroxide mainly formsA. 1-BromobutaneB. 2-BromopropaneC. 2-Bromo-2-methylpropaneD. 1-Bromo-2-methylpropane |
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Answer» Correct Answer - D `CH_(3)-overset(CH_(3))overset(|)(C)=CH_(2)+HBr overset("Perpxide")to` `CH_(3)-underset(H)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-Br` |
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| 534. |
Both electrophilic and nucleophilic additon reaction are given byA. AlkanesB. AlkynesC. AlkenesD. Carbonyl compounds |
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Answer» Correct Answer - B Alkynes give both elecctrophilic as well as nucleophilic addition reactions. |
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| 535. |
Oxidations of 1-butene with hot `KMnO_(4)` solution produces.A. `CG_(3)CH_(2)COOH+HCOOH`B. `CH_(3_CH_(2)COOH+CO_(2)`C. `CH_(3)COOH+CO_(2)`D. `(CH_(3))_(2)=O+CO_(2)` |
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Answer» Correct Answer - B `CH_(3)CH_(2)C-=CH underset(386K)overset(MnO_(4)^(-)//OH^(-))to CH_(3)CH_(2)COOH+CO_(2)` |
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| 536. |
During distillation of coal tar. Anthrace ins mainly presentA. light oilB. Heavy oilC. Middle oilD. Green oil |
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Answer» Correct Answer - D Factual questions. |
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| 537. |
The formula of Cetane isA. `CH_(3)(CH_(2))_(14)CH_(3)`B. `(CH_(3))_(3)C(CH_(2))_(11)CH_(3)`C. `C_(17)H_(34)`D. none of these |
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Answer» Correct Answer - A Hexadecane. |
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| 538. |
The correct order of heat of combustions of the following hydrocarbon is : `underset(P)Pent-1-ene " " underset(Q)Pentane " " underset(R)neopentane" "underset(S)isopentane`A. `PgtQgtRgtS`B. `QgtSgtRgtP`C. `PgtQgtSgtR`D. `SgtRgtRgtQgtP` |
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Answer» Correct Answer - B As branching increasing stability increases and heat of combution dicreases. |
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| 539. |
Which of the following substances is usedas an antilknock compound?A. Tetraethyl leadB. Lead tetrachlorideC. Lead acetateD. Ethyl acetate. |
| Answer» Correct Answer - A | |
| 540. |
In Wurtz reaction the reagent used isA. NaB. Na/liq. `NH_(3)`C. Na/dry etherD. Na/dry. Alcohol |
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Answer» Correct Answer - C In Wurtz reaction. The reagent used in Na in dry ether. |
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| 541. |
Which of the represents `alpha-methyl` naphthalene?A. B. C. D. |
| Answer» Correct Answer - D | |
| 542. |
Which of the following has highest chlorine content?A. PyreneB. DDTC. ChloralD. Gammaxane |
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Answer» Correct Answer - A `C Cl_(4)` has highest chlorine content due to greater number of chlorine atoms. |
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| 543. |
The name AK-33-X is used forA. A gunB. An antiknock compoundC. ExploisiveD. Fertilizer. |
| Answer» Correct Answer - B | |
| 544. |
Which has maximum carbon content?A. BituminousB. AnthraciteC. PeatD. Lignite. |
| Answer» Correct Answer - B | |
| 545. |
Fischer Tropsch process, the catallyst used isA. CoB. MoC. CuD. `Fe_(2)O_(3)` |
| Answer» Correct Answer - A | |
| 546. |
The approximate of benzene in 90%A. 0.4B. 0.7C. 0.65D. 0.5 |
| Answer» Correct Answer - B | |
| 547. |
Which of the following constitutes basic components of coal tar?A. XyleneB. PyridineC. CresolD. None |
| Answer» Correct Answer - B | |
| 548. |
Ozonolysis is carried outA. to detect the presence of functional groupB. to locate the position of double bondC. to detect the presence of double bondD. to detect the presence of triple bond |
| Answer» Correct Answer - B | |
| 549. |
Benzene can be converted to BHC when:A. chlorine is bubbled through benzeneB. benzene and chlorine mixture is kept in darkC. chlorine is shaken with benzeneD. chlorine and benezene is exposed to light |
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Answer» Correct Answer - D Refer to Comprehensive Review. |
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| 550. |
Which of the following fraction obtained from coal tar yields anthracene and phenanthrene?A. light oilB. Middle oilC. heavy oilD. Anthracene oil |
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Answer» Correct Answer - B Alkenes react with Conc. `H(2)SO_(4)` under ordinary conditions. |
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