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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.
| 201. |
Which of the following substance is used as antiknock compound?A. TELB. Lead tetrachlorideC. Lead acetateD. `C_2H_5PbCI` |
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Answer» Correct Answer - A TEL-Tetra Ethyl Lead |
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| 202. |
2-methyl propane on oxidation with `KMnO_(4)` givesA. 2-methyl propane-2-olB. 2-methyl propan-1-olC. butaneD. butanol-1 |
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Answer» Correct Answer - A `3^(@)` alkane oxidise into alcohol with `KMnO_(4)` |
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| 203. |
`t`-Nitro compounds may be prepared by the oxidation of……. With potassium permanganate.A. `R_(3)CNHOH`B. `R_(3)CNH_(2)`C. `R_(3)C CN`D. `R_(3)CNHNH_(2)` |
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Answer» Correct Answer - B `R_(3)CNH_(2)overset(KMnO_(4))rarrR_(3)CNO_(2)` |
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| 204. |
The reactivity of the halogens towards any given alkane isA. `I_(2) gt gt Br_(2) gt Cl_(2) gt gt F_(2)`B. `F_(2) gt gt Cl_(2) gt Br_(2) gt gt I_(2)`C. `F_(2) gt Cl_(2) gt I_(2) gt Br_(2)`D. `Cl_(2) gt F_(2) gt Br_(2) gt I_(2)` |
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Answer» Correct Answer - B `F_(2)` reacts explosively while `I_(2)` does not react at all. |
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| 205. |
Which of the follwing is not the characteristic of the mechanism of free radical halogenation chain reactions?A. Recation can be terminated prematurely by adding radical scavengers.B. Initiators such as organic preoxides can catalyze the reaction in the absence of light or heat.C. If `O_(2)` is present, there is an inhibition period after which the reaction rate decreases.D. The quantum yield is typically high. |
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Answer» Correct Answer - C A small amount of `O_(2)` gas slows down the reaction for a period of time, which depends upon the amount of `O_(2)`, after which the reaction proceeds smoothly. It is believed that `O_(2)` reacts with a methyl ( or any other alkyl) radical to form a new free radical: `.^(.)CH_(3)+O_(2)rarrCH_(3)-O-O` The `CH_(3)OO^(.)` radical is much less reactive than the `CH_(3)` radical and is helpless to continue the chain. Thus, by combining with a `CH_(3)^(.)` one `O_(2)` molecule breaks a chain and thus, slows down the reaction tremendously. The reaction is free to proceed at its normal rate after all `O_(2)` molecules present have combined with `.^(.)CH_(3)` radicals. A substance that slows down or stops a reaction even though present in small amount is called an inhibitor. The period of time during which inhibition lasts and after which the reaction proceeds normally is called the inhibition period. Inhibition by `O_(2)` is one of the strong supports for a free radical reaction. Radical scavengers are substance that combine withe free radicals, thus terminating a chain. Quantum yield is the number of product molecules produced by one photon of light. |
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| 206. |
Numbers of chain isomers shown by Nonane areA. 5B. 9C. 18D. 35 |
| Answer» Correct Answer - D | |
| 207. |
What is the correct IUPAC name of the alkyl group shown ? `{:(" "CH_(2)CH_(3)),(" "|),(-CHCH_(2)CH(CH_(3))_(2)):}A. 1-ethyl-3-methylbutylB. 1-ethyl-3,3-dimethyl propylC. 4-ethyl-2-methylbutylD. 5-methylhexyl |
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Answer» Correct Answer - A `-oversetunderset(|)(CH_2CH_3)(CH)-CH_2CH(CH_3)_2` has 1-ethyl-3-methylbutyl as the correct IUPAC name |
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| 208. |
Branching of hydrocaron chains results inA. increases in oxidation numberB. decreases in octane numberC. decreases in isomer numberD. increases in octane number |
| Answer» Correct Answer - D | |
| 209. |
What is volume of oxygen required for the complete combustion of 4 litres of ethane?A. 4 litreB. 8 litreC. 12 litreD. 14 litre |
| Answer» Correct Answer - D | |
| 210. |
If torsion angle is `60^@`, then relationship between the group is knows asA. EclipsedB. AntiC. GaucheD. Staggered |
| Answer» Correct Answer - C | |
| 211. |
The energy required to rotate ethane molecule about the carbon-carbon bond is called as ________ energy.A. PotentialB. TorsionalC. KinetelicD. Transitional |
| Answer» Correct Answer - B | |
| 212. |
Ethene gas is bubbled through the water saturated with chlorine. The major product formed will beA. Ethanoyl chlorideB. Ethylene chlorohydrinC. Ethylene chlorideD. Ethylene glycol |
| Answer» Correct Answer - B | |
| 213. |
Which has least carbon bond length-A. EthaneB. EthyneC. EtheneD. Benzene |
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Answer» Correct Answer - B Bond length becomes shorter as the bonds between carbons increases. |
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| 214. |
In ethene, the carbon-carbon bond distance isA. `154 p m`B. `120 p m`C. `139 p m`D. `134 p m` |
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Answer» Correct Answer - A `H-underset(H)underset(|)overset(H)overset(|)Cunderset(154p m)underset(or)underset(154Å)-underset(H)underset(|)overset(H)overset(|)C-H` |
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| 215. |
The `C - C - C` bond angle in long unbranched alkanes isA. `180^(@)`B. `109.5^(@)`C. slightly greater than `109.5^(@)`D. slightly smaller than `109.5^(@)` |
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Answer» Correct Answer - C Due to steric repulsion, the tetrahedral bond angle is slightly increased. |
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| 216. |
The `IUPAC` name of unbranched alkane with `20 C` atoms isA. hectaneB. icosaneC. triacontaneD. hentriacontane |
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Answer» Correct Answer - B Hectane: `CH_(3)(CH_(2))_(98)(CH)_(3)`, isosane: `CH_(3)(CH_(2))_(18)CH_(3)`, tricontane: `CH_(3)(CH_(2))_(28)CH_(3)`, hentriacontane: `CH_(3)(CH_(2))_(29)CH_(3)` |
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| 217. |
Which molecular formula indicates 2,2,4- trimethylhexane?A. `C_9H_20`B. `C_9H_18`C. `C_8H_18`D. `C_8H_16` |
| Answer» Correct Answer - A | |
| 218. |
IUPAC name of the following compound `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)H-CH_(2)-underset(C_(2)H_(3))underset(|)(C)H-CH_(2)-CH_(3)`A. 3-Ethyl-5-methyl heptaneB. 5-Ethyl-3-methyl heptaneC. 2-Ethyl-5-methyl heptaneD. 4-Ethyl-5-methyl heptane |
| Answer» Correct Answer - A | |
| 219. |
Which are the correct IUPAC names of the following compound? A. 5-Butyl-4-isopropyldecneB. 5-Ethyl-4-propyldecaneC. 5-sec-Butyl-4-iso-propyldecaneD. 4-(1-methylethyl)-5(1-methylpropyl)-decane |
| Answer» Correct Answer - A::D | |
| 220. |
The correct IUPAC name of the following alkane is A. 3,6-diethyl-2-methyloctaneB. 5-Isopropyl-3-ethyloctaneC. 3-Ethyl-5-isopropyloctaneD. 3-Isopropyl-6-ethyloctane |
| Answer» Correct Answer - A | |
| 221. |
The smallest alkane having a `3^(@)` carbon isA. `2,2`-dimethypropaneB. isopentaneC. isobutaneD. `2,3`-dimethylbutane |
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Answer» Correct Answer - C Compound (1): `C-underset(C )underset(|)overset(C )overset(|)C-C, compound (b): C-underset(C)underset(|)overset(3^(@))C-C-C` Compound (3) : `C-underset(C )underset(|)overset(3^(@))C-C, compound (d): C-underset(C)underset(|)overset(3^(@))C-underset(C )underset(|)overset(3^(@))C-C` |
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| 222. |
Which of the following is correct name according to the IUPAC rules?A. 2-MethylcyclohexaneB. 2-Ethyl-2-methylpentaneC. 3,4-DiamethylpentaneD. 3-Ethyl-2methylpentane |
| Answer» Correct Answer - D | |
| 223. |
Energy barrier between staggered and exlipsed form in ethane isA. 0.6 kcal/moleB. 2.9 kcal/ moleC. 12 kcal/moleD. 14 cal/mole |
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Answer» Correct Answer - B Energy gap =2.9kcal/mole |
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| 224. |
The smallest alkane having a quaternary `(4^(@))C` atom isA. isopentaneB. tert-butaneC. NeopentaneD. isohexane |
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Answer» Correct Answer - C Prefix neo indicates the presence of quaternary `C` atom. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)` |
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| 225. |
In the following structures which two forms are staggered conformation of ethane? A. 1 and 4B. 2 and 3C. 1 and 2D. 1 and 3 |
| Answer» Correct Answer - C | |
| 226. |
Which of the follwing is the most stable conformation of ethane?A. SkewB. GaucheC. StggeredD. Eclipsed |
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Answer» Correct Answer - C On account of minimum torsional strain, stagged conformation is the most stable. |
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| 227. |
As compared to melting poitns of even carbon chaini isomers,t he melting points of odd carbons chaini alkanes are:A. LowerB. HigherC. SameD. Not depend upon branch |
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Answer» Correct Answer - A Even number of carbon atom pack closely |
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| 228. |
Which of the follwing alkanes has the lowest melting point?A. `CH_(4)`B. `CH_(3)CH_(3)`C. `CH_(3)CH_(2)CH_(3)`D. `CH_(3)(CH_(2))_(2)CH_(3)` |
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Answer» Correct Answer - C Order of melting point: `underset(-138^(@))(n-"Butane")gtunderset(-172^(@)C)("Ethane")gt underset(-180^(@)C)("Methane")gtunderset(-187^(@)C)("Propane")` |
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| 229. |
Which of the following alkanes will have the lowest boiling point?A. n-HeptaneB. IsopentaneC. n-HexaneD. Neopentane |
| Answer» Correct Answer - D | |
| 230. |
As the molecular weight of alkanes increases, how do the boiling point and melting point change?A. Boiling point increases, melting point increasesB. Boiling point decreases, melting point decreasesC. Boiling point increases, melting point decreasesD. Boiling point increases, melting point increases sequentially for alkanes over four carbons |
| Answer» Correct Answer - D | |
| 231. |
The possible number of isomeric alkanes having the molecular formula `C_(4)H_(10)` isA. zeroB. oneC. twoD. Three |
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Answer» Correct Answer - C `CH_(3)CH_(2)underset("Butane")(CH_(2))CH_(2)CH_(3), underset("Methylpropane")(CH_(3)overset(CH_(3))overset(|)CHCH_(3)` |
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| 232. |
How many isomeric alkanes having the molecular formula `C_(5)H_(12)` are possible?A. 4B. 3C. 2D. 5 |
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Answer» Correct Answer - B `overset(1^(@))(CH_(3))underset("Pentane")((CH_(2))_(3))CH_(3), (CH_(3))_(2)underset("Isopentane")(CHCH_(2)CH_(3)), underset("Neopentane")((CH_(3))_(4)C` |
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| 233. |
Write the structures of different isomeric alkyl groups corresponding to the molecular formula `C_(5)H_(11)`. Also give the `IUPAC` names of alochols obtained by attachment of the `-OH` groups to these groups. Strategy: There are three different skeletons of five `C` atoms. Pentane has three different type of `H` atoms, isopentane has four different types of `H` atoms, and neopentane has only one type of `H` atoms. |
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Answer» `overset(1^(@))CH_(3)overset(n-"Pentaene")(overset(2_(a)^(@))CH_(2)overset(2_(b)^(@))(CH_(2))overset(2_(a)^(@))CH_(2)overset(1^(@))CH_(3))` Three alkyl groups derived from `n`-pentane and corresponding alcohols: (i) `underset(1-pentyl)(CH_(3)CH_(2)CH_(2)CH_(2)overset(1)CH_(2))- rarr underset(Pentan-1-ol)(CH_(3)CH_(2)CH_(2)CH_(2)overset(1)CH_(2)-OH)` (ii) `underset("1-Methylbutyl")(overset(2)CH_(3)overset(3)CH_(2)overset(2)CH_(2)underset(|)overset(1)CHCH_(3))rarr underset("Pentane-2-ol")(overset(5)CH_(3)overset(4)CH_(2))overset(3)CH_(2)underset(OH)underset(|)overset(2)CHoverset(1)CH_(3)` (iii) `overset(3)CH_(3)overset(2)CH_(2)underset("1-Ethylpro pryl")underset(|)overset(1)(CHCH_(2)CH_(3))rarroverset(1)CH_(3)overset(2)(CH_(2))underset("Pentan e-3-ol")(underset(OH)underset(|)overset(3)(CH)overset(4)(CH_(2))overset(5)CH_(3)` Isopentane `overset(1^(@)b)(CH_(3))overset(1^(@)b)overset(CH_(3))overset(|)(CH)underset(3^@)CH_(2)underset(2^(@))overset(1^(@)a)CH_(3)` Four alkyl groups derived from isopentane and corresponding alcohols: (iv) `overset(4)(C)H_(3)-underset("3-Methylbutyl")overset(CH_(3))overset(3|)(CH)-overset(2)(CH_(2))-overset(1)CH_(2)- rarroverset(4)CH_(3)-underset("3-Methylbutan")(overset(CH_(3))overset(3|)(CH)-overset(2)CH_(2)-overset(1)CH_(2)-OH)` (v)`overset(3)(C)H_(3)-overset(CH_(3))overset(2|)(C)H-underset("1,2-Dimethylpropyl")underset(|)overset(1)(C)H-CH_(3)rarroverset(4)(C)H_(3)overset(CH_(3))overset(3|)(CH)-underset("3-Methylbutan-2-ol")(underset(OH)underset(|)overset(2)(CH)-overset(1)CH_(3))` (vi) `CH_(3)-underset("1,1-Dimethylpropyl")(underset(|)overset(CH_(3))overset(1|)C-overset(2)CH_(2))-overset(3)CH_(3)rarroverset(1)(CH_(3))-underset("2-Methylbuta n-1-ol ")(underset(OH)underset(|)overset(CH_(3))overset(2|)C-overset(3)CH_(2)-overset(4)CH_(3))` (vii) `-overset(1)CH_(2)-underset(2-Methylbutyl)(overset(CH_(3))overset(3|)(CH))-overset(3)(CH_(2))-overset(4)(CH_(3))rarrOH-overset(1)(CH_(2))-underset(2-Methylbuta n-1-ol)(overset(CH_(3))overset(2|)(CH)-overset(3)CH_(2)-overset(4)(CH_(3)))` Neopentane `overset(1^(@))(CH_(3))underset(1^(@)CH_(3))underset(|)overset(1^(@))overset(CH_(3))overset(|)C CH_(2)^(1^(@))` Alkyl group derived from neopentane and corresponding alcohol: (viii) `overset(3)(CH_(3))-underset(2,2-"Dimethylpropyl")(underset(CH_(3))underset(|)overset(CH_(3))overset(3|)C-overset(1)(CH_(2))-) rarroverset(2)(CH_(3))-underset(2,2-"Dimethylpropan-1-ol")(underset(CH_(3))underset(|)overset(CH_(3))overset(2|)C-overset(1)CH_(2)-OH` |
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| 234. |
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-H+C Cl_(4)overset(R_(2)O_(2))to(P)+(Q)` major product (P) and (Q) will be:A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Cl`B. `CHCl_(3)`C. Both (A) and (B)D. None of these |
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Answer» Correct Answer - C |
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| 235. |
Which of the following is orrect potential energy diagram for the given chain propagating step. `underset(B.E.=435kJ//mol)(CH_(3)-H+F)tounderset(B.E.569kJ//mol)(CH_(3)+H-F)` `DeltaH^(@)=-32kcal//mol`A. B. C. D. |
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Answer» Correct Answer - D |
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| 236. |
Product will beA. B. C. Both A and BD. |
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Answer» Correct Answer - C |
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| 237. |
The correct statement about the following reaction is diagram.A. By absorption of one mole of photon of light only one mole of product (racemic mixture) is obtained.B. In total 6 optically active isomers are obtained on monochlororination of side chainC. Homolysis of III takes place in chainD. Homolysis of III takes place in chain propagation step. |
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Answer» Correct Answer - B |
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