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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.
| 901. |
The reduction of 1,3-pentadience with sodium in liquid ammonia in the persence of an alcohol givesA. pentaneB. 2-penteneC. 1-pentaneD. propene+ethene |
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Answer» Correct Answer - B `Na//liq NH_(3)` is a reducing agent `CH_(2)=CH-CH=CH-CH_(3) underset("alcohol")overset(Na//liq.NH_(3))to underset("Pent-2-ene")(CH_(3)-CH_(2)-CH-CH_(3))` This is a brich reduction to reduce terminal double bond only. |
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| 902. |
Which of the following reaction can be employed for getting unsymmetrical alkanes in good yield?A. Wurtz reactionB. Corey House reactionC. BothD. None. |
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Answer» Correct Answer - B Corey House reaction can give unsymmetrical alkenes in good yield. |
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| 903. |
What is the compostion of Zeigler Natta Catalyst? |
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Answer» Triethylaluminium and titanium tetracholride inert solvent. |
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| 904. |
Point out A in the given reaction sequence `Aoverset(O_(3)//H_(2)O_(2))rarrBoverset(Delta)rarr2CH_(3)COOH+CO_(2)`A. B. C. D. |
| Answer» Correct Answer - C | |
| 905. |
Minimum number of carbon atoms required for an alkane to show any kind of isomerism.A. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - C | |
| 906. |
Assertion. Propene is more reactive than ethene towards electrophilic addition reactions Reason. Hyperconjugation effect of the `CH_3` group increases the electron density in the double bondA. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is false.D. If both assertion and reason are false |
| Answer» Correct Answer - A | |
| 907. |
Which double bond in the given molecule is most reactive towards an electrophile? A. AB. BC. CD. D |
| Answer» Correct Answer - 4 | |
| 908. |
metachloroperbenzoic acid Product (A) of the above reaction is:A. B. C. D. |
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Answer» Correct Answer - b More nucleophillic alkane will react. |
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| 909. |
, product is: MCPBA `to` Metachloroperbenzoic acidA. B. C. D. |
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Answer» Correct Answer - b Oxidation take place i.e. epoxidation. |
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| 910. |
Consider the following reactants, (I) `CH_(3)-COCH_(3)overset(A)rarr CH_(3)-CH_(2)-CH_(3)` (II) `(CH_(3))_(3)CH overset(B)rarr (CH_(3))_(3)COH` brgt Here, A and B respectively areA. Zn(Hg)/HCl(conc.) and `KMnO_(4)`B. `KMnO_(4)` and Zn(Hg)/conc.HClC. `H_(2)//Ni` and `KMnO_(4)`D. `CH_(3)OH` and `C_(2)H_(5)OH` |
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Answer» Correct Answer - A `CH_(3)COCH_(3)underset(2(H))overset(Zn(Hg)//HCl)rarrCH_(3)CH_(2)CH_(3)+H_(2)O` `(CH_(3))_(3)CH overset(KMnO_(4))rarr underset(3^(@)"alcohol")((CH_(3))_(3)COH)` |
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| 911. |
Toluene reacts with halogen in presence of iron (III) chloride giving ortho- and para-halo-compounds. The reaction isA. free radical addition reactionB. electrophilic elimination reactionC. nucleophilic substitution reactionD. electrophilic substitution reaction |
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Answer» Correct Answer - D `CH_3` group is o,p-directing . Therefore , toluene on electrophilic substitution gives a mixture of o- and p- toluenes. |
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| 912. |
if we take ethylidene chloride and isopropylidene chloride with zinc dust then product will be -A. 2-buteneB. 2-butene+2,3-dimethyl1-2-buteneC. 2-methyl-2-buteneD. 2-butene,2-methyl-2-buene. 2,3=dimethyl-2-butene |
| Answer» Correct Answer - D | |
| 913. |
Ethylidene chloride is formed by treating acetylene wit:A. HClB. `Cl_(2)` in the presence of `C Cl_(4)`C. HOClD. `Cl_(2)` in presnce of organic peroxide |
| Answer» Correct Answer - A | |
| 914. |
Assertion. Acetylene on treating with `NaNH_2`, gives sodium acetylide and ammonia Reaction. sp-Hybridized carbon atoms of acetylene are considerably electronegative.A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is false.D. If both assertion and reason are false |
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Answer» Correct Answer - B Correct explanation. Acetylene is a stronger acid than ammonia. |
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| 915. |
Which of the following hydrocarbons has the lowest dipole moment?A. B. `CH_(3)C-=C CH_(3)`C. `CH_(3)CH_(2)-=CH`D. `CH_(2)=CH-C-=CH` |
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Answer» Correct Answer - B `Conc. H_(3)PO_(4)` is a dehydrating agent and it will convert cyclohexanol to cyclobexene. |
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| 916. |
In reaction `BrCH_(2)-CH_(2)Br+Zn to Y+ZnBr_(2)`. Y isA. EthyneB. EtheneC. EthaneD. None |
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Answer» Correct Answer - B `Br-CH_(2)-CH_(2)-Br+Zn to H_(2)C=CH_(2)+ZnBr` |
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| 917. |
A compound X `(C_5H_8)` reacts with ammoniacal `AgNO_3` to give a white precipitate, and on oxidation with hot alkaline `KMnO_4` gives the acid, `(CH_3)_2CHCOOH`. Therefore , X isA. `CH_2=CHCH=CHCH_3`B. `CH_3(CH_2)_2C-=CH`C. `(CH_3)_2CH-C-=CH`D. `(CH_3)_2C=C=CH` |
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Answer» Correct Answer - C Terminal alkyne containing `(CH_3)_2CH` group on oxidation gives `(CH_3)_2CHCOOH`. |
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| 918. |
product (A) is:A. B. C. D. |
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Answer» Correct Answer - c Three times ring expansion. |
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| 919. |
Choose the correct product of this recation: A. B. C. D. |
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Answer» Correct Answer - b Halohydrin will form (anti- additon) |
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| 920. |
How many stereoisomeric pentabromides will be formed in the following reaction? A. `2`B. `3`C. `4`D. None of these |
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Answer» Correct Answer - a a |
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| 921. |
Choose the correct product of this recation: A. B. C. D. |
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Answer» Correct Answer - c Anti - addition take place . (i.e., anti -hydroxylation). |
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| 922. |
How many stereoisomeric tetrabromides will br formed in the following reaction? A. `2`B. `3`C. `4`D. `6` |
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Answer» Correct Answer - b b |
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| 923. |
Assertion (A) : Toluene on Friedel Crafts methylation gives o- and p- xylene. Reason (R): `CH_3`-group bonded to benzene ring increases electron density at o- and p- position.A. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.B. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.C. Both Assertion and Reason are not correctD. Assertion is not correct but Reason is correct. |
| Answer» Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. | |
| 924. |
The correct structure for triphenylbromomethane isA. B. C. D. |
| Answer» Correct Answer - A | |
| 925. |
Coal tar is the main source ofA. aromatic compoundsB. alicyclic compoundsC. aliphatic compoundsD. nitro compounds. |
| Answer» Correct Answer - A | |
| 926. |
Which of the following is the main component of heavy oil fraction of coal tar?A. Naphthol and cresolB. PhenolC. TouluenceD. `beta`-Napthylamine. |
| Answer» Correct Answer - A | |
| 927. |
During the fractional distillation of coal tar the fractrion obtained at 530K isA. light oilB. anthracene oilC. heavy oilD. middle oil |
| Answer» Correct Answer - C | |
| 928. |
Assertion: Melting point of neopentane is higher than that of n-pentane but the boiling point of n-pentane is higher than that of neopentane.Reason: Melting point depends upon packing of molecules in the crystal lattice while boiling point depends upon surface area of the molecule.(a) A is correct, R is correct and R is a correct explanation of A.(b) A is not correct,R is correct and R is not a explanation for A.(c) Both A and R are wrong.(d) R is correct reason but A is wrong. |
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Answer» (a) A is correct, R is correct and R is a correct explanation of A. |
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| 929. |
The most suitable sequence of reagents to perform this conversion isA. HBr then `(CH_(3))_(3)COK//(CH_(3))_(3)C-OH`B. NBs then alcoholic KOHC. HBr-peroxide then `CH_(3)CH_(2)OK//CH_(3)CH_(2)OH`D. HBr-peroxide then `(CH_(3))_(3)COK//(CH_(3))_(3)COH` |
| Answer» Correct Answer - D | |
| 930. |
The principal organic product formed in the reaction given below is: `CH_(2)=CH(CH_(2))_(8)COOH + HBr overset("peroxide")(to).......`A. `CH_(3)-CHBr(CH_(2))_(8)COOH`B. `CH_(2)-CH(CH_(2))_(8)COBr`C. `CH_(2)BrCH_(2)(CH_(2))_(8)COOH`D. `CH_(2)=CH(CH_(2))_(7)CHBrCOOH` |
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Answer» Correct Answer - C `CH_(2)=CH(CH_(2))_(8)COOH+HBr` ` underset("Antimarkownikoff addition") overset("peroxide")to Br-CH_(2)-CH_(2)(CH_(2))_(8)COOH ` |
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| 931. |
(A)`overset(HBr)rarrCH_(3)-CH=CH_(2)underset(("Peroxide"))overset(HBr)rarr(B)` Find the product (A) and (B) in the given reactionA. `CH_(3)-underset(Br)underset(|)(CH)-CH_(3),CH_(3)-CH_(2)-CH_(2)-Br`B. `CH_(3)-CH-CH_(2)-Br,CH_(3)-underset(Br)underset(|)(CH)-CH_(3)`C. `Br-CH_(2)-CH=CH_(2),CH_(3)-CH=CH-Br`D. `underset(Br)underset(|)(CH_(2))-CH=CH_(2),CH_(3)-underset(Br)underset(|)(C)=CH_(2)` |
| Answer» Correct Answer - A | |
| 932. |
Consider the following reaction: `CH_(3)underset(D)underset(|)CH-underset(CH_(3))underset(|)(CH)CH_(3)+overset(.)BrrarrX+HBr` Identify the structure of the major products `(X)` from among the following :A. `CH_(3)-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(2)`B. `CH_(3)-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)(C)-CH_(3)`C. `CH_(3)-underset(D)underset(|)(CH)-CH_(3)`D. `CH_CH-underset(CH_(3))underset(|)(CH)-CH_(3)` |
| Answer» Correct Answer - B | |
| 933. |
Consider the following reaction: Identify the structure of the major product X.A. `H_(3)C-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-overset(**)CH_(3)`B. `H_(3)C-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)overset(*)(C)-CH_(3)`C. `H_(3)C-underset(D)underset(|)overset(*)(C)-underset(CH_(3))underset(|)(CH)-CH_(3)`D. `H_(3)C-CH-underset(CH_(3))underset(|)(CH)-CH_(3)` |
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Answer» Correct Answer - B A `3^(@)` carbon |
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| 934. |
Identify correct order of reactivity in electronphilic substitution reactions of the following compounds A. `1 gt 2 gt 3 gt 4 `B. `4 gt 3 gt 2 gt 1`C. `2 gt 3 gt 1 gt 4`D. `2 gt 1 gt 3 gt 4` |
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Answer» Correct Answer - C Due to +I effect of `CH_(3)` group, toluence (2) has higher electron density than benzene (1). Out of Cl and `NO_(2), NO_(2)` group has a strong `-I` effect and -M effect while chlorine has a weak -I effect, therefore, nitrobenzene(4) has a much a lower electron density than chlorobenzene. Thus the overall reactivity order is `2 gt 3 gt 4` i.e. option C is the answer. |
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| 935. |
The alkene `R-CH=CH_(2)` reacts readily with `B_(2)H_(6)` and formed the product `B` which on oxidation with alkaline hydrogen peroxide producesA. `R-CH_(2)-CHO`B. `R-CH_(2)-CH_(2)-OH`C. `R-underset(CH_(3))underset(|)(C )=O`D. `R-underset(OH)underset(|)(C )H-underset(OH)underset(|)(C )H_(2)` |
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Answer» Correct Answer - b `6R-CH=CH_(2)overset(B_(2)H_(6))underset(Ether, 0^(@)C)rarr2(RCH_(2)CH_(2))Boverset(H_(2)O_(2))underset(NaOH)rarr6RCH_(2)CH_(2)OH+2H_(3)BO_(3)` |
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| 936. |
When an alkene reacts with a peracid, the product isA. AlkaneB. AlkyneC. EpoxideD. None of these |
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Answer» Correct Answer - C When an alkene reacts with preacid, an epoxide is formed. |
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| 937. |
`underset(Br)underset(|)(CH_(2))-CH=CH-underset(Br)underset(|)(CH_(2))overset(ZnCH_(3)OH)rarr` Product The predominating product isA. B. `CH_(2)=C=C=CH_(2)`C. `CH_(2)=CH-CH=CH_(2)`D. |
| Answer» Correct Answer - C | |
| 938. |
The reaction is `:` `CH_(3)CHBr-CH_(2)Br+2KOH("alc.")overset(Delta)rarr CH_(3)-C equiv CH+2KBr+2H_(2)O`A. DeharlogenationB. DehydrohalogenationC. DecarboxytationD. Dehydration |
| Answer» Correct Answer - B | |
| 939. |
Match the following list A. All of the aboveB. I and IIC. III and IVD. I,IV |
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Answer» Correct Answer - C,D (C ) and (D) have `4pi` electrons hence they do not obey Huckel, rule. Aromatics contains (4n+2) electrons. Where n=0,1,3 etc |
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| 940. |
Which is used as antiknock in petrol ?A. Tetraethyl leadB. Tetramethyl leadC. Tetrapropyl leadD. Tetrabutyl lead |
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Answer» Correct Answer - A Tetraethyl lead `(` TEL `)` is used as antiknock in petrol. |
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| 941. |
`CH_(2)=CH_(2)overset(Cl_(2))toAoverset(AgOH)to`? The product is a-A. GlycolB. DialC. Dioic acidD. none of these |
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Answer» Correct Answer - A `CH_(2)=CH_(2)overset(Cl_(2))tounderset(Cl)underset(|)(C)H_(2)-overset(Cl)overset(|)(C)H_(2)underset(-2AgCl)overset(2AgOH)tounderset(OH)underset(|)(C)underset("Ethylene glycol or glycol")(H_(2)-overset(OH)overset(|)(C)H_(2))` |
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| 942. |
Propyne and propene can be distinguished by `:`A. `conc.H_(2)SO_(4)`B. `Br_(2) "in"C C l_(4)`C. dil.`H_(2)SO_(4)`D. `AgNO_(3)` in ammonia |
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Answer» Correct Answer - D Only propyne will give white ppt. with `AgNO_(3)` in ammonia (This test is given ) |
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| 943. |
Propyne and propene can be distinguished by `:`A. Conc. `H_(2)SO_(4)`B. `Br_(2)` in `C Cl_(4)`C. Dil. `KMnO_(4)`D. `AgNO_(3)` in ammonia |
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Answer» Correct Answer - d Terminal alkyne gives white ppt. with ammonical silver nitrate. `CH_(3)-C-=CH+NH_(3)+AgNO_(3)rarr underset(white ppt. )(CH_(3))-C-=C.Ag+NH_(4)NO_(3)` white propene does not give any reaction with ammonical `AgNO_(3)` due to absence of acidic hydrogen. |
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| 944. |
Which of the following reactions does not show the acidic nature of ethyne?A. Acetylene reacts with sodamide to form sodium acetylides.B. When passed through ammoniacal cuprous chloride solution, a red precipitate is formedC. Acetylene reacts with chloine in the dark to form di or tetrachlorides.D. Acetylene when passed throguh ammoniacal silver nitrate gives a white precipitate |
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Answer» Correct Answer - C It is an addition reaction, so it does not show the acidic nature of ethyne. |
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| 945. |
`overset(H)overset(|)(CH_(2))-overset(Cl)overset(|)(CH_(2))underset(alk)overset(NaOH)toCH_(2)=CH_(2)`. Most probable mechanism for this reaction is-A. E1B. E2C. E1CBD. `alpha` elimination |
| Answer» Correct Answer - B | |
| 946. |
Which of the following will give 2,2-dibromopropane on reaction with HBr?A. `CH_(2)-CH=CH_(2)`B. `CH_(3)C-=CH`C. `CH_(3)CH=CHBr`D. `CH-=CH` |
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Answer» Correct Answer - B `CH_(3)C-=CH overset(HBr) to CH_(3)-underset(Br)underset(|)(C)=CH_(2) overset(Hbr)to underset("2,2-Dibromopropane")(CH_(3)-underset(Br)underset(|)overset(Br)overset(|)(C)-CH_(3))` |
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| 947. |
Which of the following reactions is not an example of electrophilic substitution in benzene ring?A. B. C. D. |
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Answer» Correct Answer - C `Cl_(2)` is added to benzene ring is presence of sunlight to give benzene hexachloride is a free radical reaction. |
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| 948. |
What are the different types of electrophilic substitution reactions of benzene? |
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Answer» i. Benzene shows electrophilic substitution reactions, in which one or more hydrogen atoms of benzene ring are replaced by groups like – Cl, – Br, – NO2 , – SO3H, -R, -COR, etc. ii. Different types of electrophilic substitution reactions of benzene are as follows:
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| 949. |
The compound 1,3-butadiene hasA. Only `sp` hybridized carbon atomsB. Only `sp^(2)` hybridized carbon atomsC. Both sp and `sp^(2)` hybridized carbon atomsD. `sp,sp^(2)` and `sp^(3)` hybridized carbon atoms |
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Answer» Correct Answer - B `underset(sp^(2))underset(darr)(C)H_(2)=underset(sp^(2))underset(darr)(C)H-underset(sp^(2))underset(darr)(C)H=underset(sp^(2))underset(darr)(C)H_(2)` |
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| 950. |
Acetylenic hydrocarbons are acidic becauseA. Sigma electron density of `C-H` bond in acetylene is nearer a carbon which has `50% s-` characterB. Acetylen has only one hydrogen atom at each carbon atomC. Acetylene contains least number of hydrogen atoms among the possibleD. Acetylene belongs to the class of alkynes with formula `C_(n) C_(2n-2)` |
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Answer» Correct Answer - A The acidic character of `H` is , `F-HgtO-H gt -=C-HgtN-H,H` atom atttached on `F,O,N` and triply bonded carbon is acidic. |
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