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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.
| 401. |
Which one of the following shows three possible isomeric structures’?(a) C4H10 (b) C5H12 (c) C6H12 (d) C3H14 |
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Answer» Correct answer is (b) C5H12 |
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| 402. |
The addition of HBr to 1-butene gives a mixture of products A, B and CThe mixture consists of(i) A and B as major and C as minor products(ii) B as major, A and C as minor products(iii) B as minor, A and C as major products(iv) A and B as minor and C as major products |
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Answer» (i) A and B as major and C as minor products |
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| 403. |
Find out the branched hydrocarbon from the following compounds. (a) 1 – propane (b) n – propane (c) iso – butane (d) n – butane |
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Answer» Correct answer is (c) iso – butane |
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| 404. |
The order of reactivity of different hydrogen halides (HCl, HI , HBr) is ……….. |
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Answer» The order of reactivity of different hydrogen halides (HCl, HI , HBr) is HI >HBr >HCl. |
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| 405. |
Arrange the following carbanions in order of their decreasing stability.(A) H3C – C ≡ C– (B) H – C ≡ C– (i) A > B > C(ii) B > A > C(iii) C > B > A(iv) C > A > B |
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Answer» (ii) B > A > C |
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| 406. |
Which of the following will not show geometrical isomerism? |
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Answer» The correct answer is (iv) |
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| 407. |
Which of the following compounds will form a hydrocarbon on reaction with a Grignar reagent ?A. `CH_(3)CH_(2)OH`B. `CH_(3)CHO`C. `CH_(3)COCH_(3)`D. `CH_(3)CO_(2)CH_(3)` |
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Answer» Correct Answer - d d |
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| 408. |
Arrange the following hydrogen halides in order of their decreasing reactivity with propene.(i) HCl > HBr > HI(ii) HBr > HI > HCl(iii) HI > HBr > HCl(iv) HCl > HI > HBr |
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Answer» (iii) HI > HBr > HCl |
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| 409. |
Arrange the following hydrogen halides in order of their decreasing reactivity with propeneA. HCl gt HBr gt HIB. HBr gt HI gt HClC. HI gt HBr gt HClD. HCl gt HI gt HBr |
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Answer» Correct Answer - C Reactivity increases as the strength of H-X bond decreases, i.e., HI gt HBr gt HCl |
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| 410. |
Position of double bond in alkene can be identified byA. Bromide waterB. Ammonical silver nitrate solutionC. OzonolysisD. None of these |
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Answer» Correct Answer - C Position of double bond in alkene can be identified with ozonolysis |
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| 411. |
A salt producing hydrocarbon among these compound isA. EhtyneB. EtheneC. MethaneD. Ethane |
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Answer» Correct Answer - A `underset("Salt")(Ca^(2+)+C_(2)^(2-))+2H_(2)O to underset("Ethyne")(CH-=CH+Ca(OH)_(2))` But `Al_(4)Cl_(3)` is a colvalent compound and cannot be taken as a salt. |
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| 412. |
Which one of the following have lowest octane numberA. Iso-octaneB. n-heptaneC. n-HexaneD. n-Hexadecane |
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Answer» Correct Answer - D Strainght chain alkanes have lower octane number than branced chain alkanes. Further, the value of octane number decreases with increase in length of carbon chain. Therefore, n-hexadecane `(C_(16)H_(34))` has lowest octane number |
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| 413. |
Assertion: It is possible to isolate pure staggered or pure eclipsed ethane at room temperature.Reason: The energy difference between staggered and eclipsed forms of ethane is only 12.5 KJ/mol.(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» (b) A is not correct,R is correct and R is not a explanation for A. |
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| 414. |
How is ethene prepared? |
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Answer» When 1, 2-dihaloalkanes (vicinal dihalides) are heated with zinc metal in presence of methanol corresponding alkenes are formed. This reaction is called dehalogenation. |
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| 415. |
What are the conditions for Geometrical isomerism? |
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Answer» (i) The molecule should contain double bond. (ii) Each carbon atom joined by the double bond, must be attached to two different groups. |
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| 416. |
Which are the correct IUPAC names of the following compound?(i) 5 – (2′, 2′–Dimethylpropyl)-decane(ii) 4 – Butyl – 2,2– dimethylnonane(iii) 2,2– Dimethyl – 4– pentyloctane(iv) 5 – neo-Pentyldecane |
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Answer» (i) 5 – (2′, 2′–Dimethylpropyl)-decane (iv) 5 – neo-Pentyldecane |
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| 417. |
The copound which forms only Acetaldehyde on Ozonalysis isa) Ethane b) Propane c) But -1-ene d) Butene |
| Answer» c) But -1-ene | |
| 418. |
Which are the correct IUPAC names of the following compound?(i) 5– Butyl – 4– isopropyldecane(ii) 5– Ethyl – 4– propyldecane(iii) 5– sec-Butyl – 4– iso-propyldecane(iv) 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane |
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Answer» (iii) 5– sec-Butyl – 4– iso-propyldecane (iv) 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane |
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| 419. |
Which of the following alkenes on ozonolysis give a mixture of ketones only? |
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Answer» (iii, iv) Alkenes which have two substituents on each carbon atom of the double bond give a mixture of ketones on ozonolysis. Thus, options (iii) and (iv) give mixture of ketones. |
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| 420. |
What is the product which is poisonous and causes air pollution formed by incomplete combustion of alkane? |
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Answer» When alkanes are subjected to incomplete combustion, it forms carbon monoxide and carbon (soot). i. 2CH4(g) + 3O2(g) → 2CO(g) + 4H2O(g) ii. CH4(g)+ O2(g) → C(s) + 2H2O(l) |
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| 421. |
The molecules having dipole moment are __________.(i) 2,2-Dimethylpropane(ii) trans-Pent-2-ene(iii) cis-Hex-3-ene(iv) 2, 2, 3, 3 - Tetramethylbutane. |
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Answer» (ii) trans-Pent-2-ene |
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| 422. |
Methane if formed whenA. Sodium acetate is heated with soda`-`limeB. Iodomethane is reducedC. Aluminium carbide reacts with waterD. All of these |
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Answer» Correct Answer - d d |
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| 423. |
Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?(i) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)(ii) CH4 (g) + O2 (g) → C (s) + 2H2O (l)(iii) CH4 (g) + O2 (g) +Mo2O3→ HCHO + H2O(iv) 2CH4 (g) + O2 (g) +Cu/523/100 atm→ 2CH3OH |
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Answer» (iii) CH4 (g) + O2 (g) +Mo2O3→ HCHO + H2O (iv) 2CH4 (g) + O2 (g) +Cu/523/100 atm→ 2CH3OH Reactions in which methane does not undergo complete combustion to give carbon dioxide and water or incomplete combustion to give carbon and water are controlled oxidation reactions. |
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| 424. |
Which of the following reactions of methane incomplete combustion :A. `2CH_4+O_2 overset"Cu/523 K / 100 atm"to 2CH_3OH`B. `CH_4+O_2 overset(Mo_2O_3)to HCHO+H_2O`C. `CH_4+O_2 to C(s) + 2H_2O (l)`D. `CH_4+2O_2 to CO_2 (s) + 2H_2O (l)` |
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Answer» Correct Answer - C Complete combustion of `CH_4` gives `CO_2` and `H_2O` . Therefore , reaction (c ) in which `CH_4` is converted into C and `H_2O` is an incomplete combustion reaction. |
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| 425. |
Write IUPAC names of the following compounds:(i) CH3 – CH = CH2(ii) CH3 – CH2 – CH = CH2(iii) CH3 – CH = CH–CH3 |
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Answer» (i) Propene (ii) But-1-ene (iii) But-2-ene |
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| 426. |
Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions ?A. `CH_4 (g) +2O_2(g) to CO_2 (g) + 2H_2O (l)`B. `CH_4(g) + O_2 (g) to C (s) + 2H_2O(l)`C. `CH_4(g) + O_2(g) overset(Mo_2O_3)to HCHO + H_2O`D. `2CH_4(g) + O_2 overset"Cu/523 K/100 atm"to 2CH_3OH` |
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Answer» Correct Answer - C::D Reaction (c ) and (d) in which `CH_4` does not undergo complete combustion to give `CO_2` and `H_2O` or incomplete combustion to C and `H_2O` are controlled oxidation reactions. |
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| 427. |
Define benzenoids Compounds. |
| Answer» Aromatic compounds containing benzene ring. | |
| 428. |
Write the IUPAC name of following aromatic compound |
| Answer» 1,2-Dimethylbenzene | |
| 429. |
The reagents for the following conversion A. alcoholic KOHB. alcholic KOH followed by `NaNH_(2)`C. aquesous KOH followed by `NaNH_(2)`D. `Zn//CH_(3)OH` |
| Answer» Correct Answer - B | |
| 430. |
when ethyl is heated with con.`H_(2)SO_(4)` at 443K ethlene is formed byA. Intramolecular hydrationB. Intermolecular hydrationC. Intermolecular dehydrationD. Intramolecular dehydration |
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Answer» Correct Answer - D Formation of an alkene from alcohol is an example of intramoleuclar dehydration, as `H_(2)O` is lost from one molecular of ethyl alcohol. |
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| 431. |
Structures of `sigma`-complex formed during nitration of Anisole would beA. B. C. D. |
| Answer» Correct Answer - A::C | |
| 432. |
The reactivity of alkyl haliders for Wurtz reaction is :A. `1^(@)gt2^(@)gt3^(@)`B. `3^(@)gt2^(@)gt1^(@)`C. `2^(@)gt3^(@)gt1^(@)`D. `1^(@)gt3^(@)gt2^(@)` |
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Answer» Correct Answer - B `3^(@)` halides may produce alkene during Wurtz reaction |
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| 433. |
Which of the following exhibits geometrical isomerism ?A. 1,2-DibromopropeneB. 2,3-Diemthylbut-2-eneC. 2,3-Dibrobut-2-eneD. 2-Methylbut-2-ene |
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Answer» Correct Answer - A Only in 1,2-dibromopropene `(CH_3CBr=CHBr)` both the carbon atoms of the double bond have different substituents and hence shows geomerical isomerism. |
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| 434. |
Which p - orbital froms ` pi ` - bond ? |
| Answer» The unhybridized p-orbital lying perpendicular to the hybridized p-orbital undergoes sideways overlapping to form `pi`- bond | |
| 435. |
What is the common name of benzene hexachloride ? |
| Answer» Correct Answer - Gammaxane | |
| 436. |
What is the number of a and n bonds in N ≡ C-CH = CH- C ≡ N? |
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Answer» There are 7 σ bonds and 5 π bonds. |
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| 437. |
Calculate number of sigma (σ) and pi (π) bonds in the following(i) CH2 = C (CH2CH2CH3)2 (iii) CH3 – CH = CH–CH3 |
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Answer» (i)Sigma bonds=23, pi bonds=1 (ii)Sigma bonds=14, pi bonds=1 (iii)Sigma bonds=11, pi bonds=1 |
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| 438. |
What is the number of σ and π bond in N ≡ C – CH = CH – C ≡ N? |
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Answer» There are 7σ bonds and 5 π-bonds. |
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| 439. |
What are aromatic hydrocarbons? |
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Answer» Benzene and all compounds that have structures and chemical properties resembling benzene are called as aromatic hydrocarbons. |
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| 440. |
What is decarboxylation? |
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Answer» The reaction which involves removal of a carboxyl group (-COOH) in the form of carbon dioxide (CO2) is known as decarboxylation reaction. R – COOH → R – H + CO2 |
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| 441. |
What are benzenoid and non-benzenoid aromatics? |
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Answer» Benzenoid aromatics are compounds having at least one benzene ring in the structure. e.g. Benzene, naphthalene, anthracene, phenol, etc., Non-benzenoid aromatics are compounds that contain an aromatic ring, other than benzene. e.g. Tropone, etc. |
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| 442. |
Define conformers/rotamers. |
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Answer» The spatial arrangements of atoms which can be converted into one another by rotation around a C-C single bond are called conformations or conformers or rotamers |
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| 443. |
Why do alkynes not show geometrical isomerism? |
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Answer» Alkynes have linear structure. So they cannot show geometrical isomerism. |
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| 444. |
What is benzenoid and non-benzenoid? |
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Answer» Aromatic compounds containing benzene ring are known as benzenoids and those not containing a benzene ring are known as non-benzenoids. |
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| 445. |
Which of the following is not formed in given reaction? A. B. C. D. |
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Answer» Correct Answer - D (d) is not allylic product. |
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| 446. |
What is the type of bond present between the two carbon atoms in ethane? |
| Answer» Correct Answer - sigma bond. | |
| 447. |
What is the common name of the compound given below? `CH_(3)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)` |
| Answer» Correct Answer - Isohexane. | |
| 448. |
Write the common name of the given compound. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(2)-CH_(3)` |
| Answer» Correct Answer - Neohexane. | |
| 449. |
Write the structure of 3,5,7-Trimethyl decane. |
| Answer» `H_(3)C-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-CH_(3)` | |
| 450. |
What is decarboxylation? Give an example. |
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Answer» The process by which carbon dioxide is removed from sodium acetate (or any sodium salt of acid) with the help of sodalime is called decarboxylation. CH3COONa + NaOH ------> CaO CH4 +Na2CO3. |
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