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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. |
The compound which would give the most stable carbcation on dehydration is :A. `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)OH`B. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OH`C. `CH_(3)-CH_(2)-CH_(2)-CH_(2)OH`D. `CH_(3)-underset(OH)underset(|)(CH)-CH_(2)CH_(3)` |
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Answer» Correct Answer - B The order of stability of carbocation ion is tertiarygtsecondarygtprimarygtmethyl Tertiary carbonium ions (in b) are more stable because of electron releasing (`+I` effect) nature of `CH_(3)` group due to which the +ve charge gets dispersed to maximum extent. |
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| 202. |
Aromatic amines are weakly basic, whereas is strongly basic, explain this unusual behaviour. |
| Answer» Planarity between lone pair of nitrogen and `pi`-electron of ring last due to two bulky groups on ortho position | |
| 203. |
Which of the following hydocarbon can be readily deprotonated by NaOEt? Explain.A. B. C. D. |
| Answer» Only III can be deprotonated by NaOEt as its conjugate base in aromatic | |
| 204. |
Which of the following is the correct IUPAC name ?A. 3-Ethyl-4, 4-dimethylheptaneB. 4, 4-Dimethyl-3-ethylheptaneC. 5-Ethyl-4, 4-dimethylheptaneD. 4, 4-Bis (methyl) 3-ethylheptane |
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Answer» Correct Answer - A is the correct IUPAC name |
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| 205. |
The IUPAC name for `CH_(3)-overset(O)overset(||)(C)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-OH` is :A. 1-Hydroxypentane-1, 4-dioneB. 1, 4-DioxopentanolC. 1-Carboxybutan-3-oneD. 4-Oxopentanoic acid |
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Answer» Correct Answer - D is the correct IUPAC name |
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| 206. |
The IUPAC name for isA. 1-Chloro-2-nitro-4-methylbenzeneB. 1- Chloro-4-methyl-2-nitrobenzeneC. 2-Chloro-1-nitro-5-methylbenzeneD. m-Nitro-p-chlorotoluene |
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Answer» Correct Answer - B is the correct IUPAC name |
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| 207. |
Which of the following ions is more stable ? |
| Answer» Structure [A] is more stable as compound to structure (B). Actually, an andocyclic double bond (present within the ring) is present in structure [A]. On the other hand, an exocyclic double bond (present outside the ring) is present in structure [B]. As a result, structure [A] is more stable as compared to structure [B]. | |
| 208. |
0.525g of an organic compound gave 0.356g of silver chloride by a halogen estimation method. Find the % of Cl in the compound. |
| Answer» Percentage of Cl`=(35.5xx0.356)/(143.5xx0525)xx100=16.77%` | |
| 209. |
0.2 g of an organic compound on complete combustion produces 0.18 g of water. The precentage of hydrogen in it is:A. 5B. 10C. 15D. 20 |
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Answer» Correct Answer - B Percentage of `H` `=2/18xx("Mass of "H_(2)O)/("Mass of compound")xx100` `=2/18xx0.18/0.20xx100=10` |
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| 210. |
Which process is suitable for the purification of aniline ?A. Simple distillationB. Steam distillationC. Fractional distillationD. Fractional crystallisation |
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Answer» Correct Answer - B Aniline is purified by steam distillation. |
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| 211. |
0.15 gm of an organic compound gave 0.12 gm of silver bromide by the carius method. Find the percentage of bromine in the compound. |
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Answer» Molar mass of AgBr = 108 + 80 = 188 g `mol^(-1)` 188 g AgBr contains 80 g bromine 0.12 g AgBr contains `(80xx0.12)/188` g bromine Percentage of bromine=`(80xx0.12xx100)/(188xx0.15)` =34.04% |
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| 212. |
0.40 g of an organic compound gave 0.30 g of silver bromide by carius method. Determine the percentage bromine in the compound. |
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Answer» Mass of the compound `=0.40 g` Mass of silver bromide `=0.30 g` `{:(AgBr,equiv,Br),((108+80)" part",,"80 parts"),(=188 g,,80 g):}` 188g of silver bromide contain bromine `= 80 g` 0.30 g of silver bromide contain bromine `=80/188xx0.30 g` Percentage of bromine `=("Mass of bromine")/("Mass of compound")xx100=80/188xx0.30/0.40xx100=31.9` |
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| 213. |
Which among the following oxides is neutral ?A. COB. `SnO_(2)`C. `ZnO`D. `SiO_(2)` |
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Answer» Correct Answer - A `CO` is neutral oxide. |
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| 214. |
Select correct statement about `I` effect?A. `I` effect transfers electrons from one carbon atom to another.B. `I` effect is the polarisation of `sigma` bond electrons.C. `I` effect creates net charge in the molecule.D. `I` effect is distance independent. |
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Answer» Correct Answer - B `I` effect is distance dependent. |
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| 215. |
Among the following compounds, the strongest acid is :A. `HC-=CH`B. `C_(6)H_(6)`C. `C_(2)H_(6)`D. `CH_(3)OH` |
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Answer» Correct Answer - D Order of acidic strength is: `CH_(3)OHgtHC-=CHgtC_(6)H_(6)gtC_(2)H_(2)` |
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| 216. |
The inductive effects of the group `-CH_(3),-COO^(-),-Br,-NH_(3)^(+)` respectively areA. `+I,-I,+I,+I`B. `-I,+I,-I,+I`C. `-I,-I,+I,+I`D. `+I,+I,-I,-I` |
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Answer» Correct Answer - D Methyl group and carboxylate group `(-COO^(-))` both give electron donating `+I`-effect while `-Br` and `-NH_(3)^(+)` give electron withdrawing `-I`-effect. |
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| 217. |
Which of the following pairs of species are isostructural ?A. `CH_(3)^(+),CH_(3)^(-)`B. `NH_(3),CH_(3)^(-)`C. `BF_(3),overset(oplus)CH_(3)`D. `overset(cdot)CH_(3),overset(+)CH_(3).` |
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Answer» Correct Answer - B::C::D (B) `NH_(3)" and "CH_(3)` are isostructural (both are pyramidal) (C) `BF_(3)" and "overset(+)CH_(3)` are isostructural (both are triangular planar). |
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| 218. |
Isovalent hyperconjugation explanis the stability ofA. CarbocationsB. CarbanionsC. Free radicalsD. carbenes. |
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Answer» Correct Answer - A::C Isovalent hyperconjugation explains the stability of carbocations and free radicals. |
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| 219. |
Homolytic fission of organic compound yieldsA. ElectrophilesB. NucleophilesC. Free radicalsD. Electrophiles and nucleophiles. |
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Answer» Correct Answer - A::C Homolytic fission produces free radicals and free radicals are also electrophiles. |
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| 220. |
The number of bromine molecles required for the Decolurisation of 1 mole of ehtene and etyne are respectivelyA. one and threeB. two and threeC. one and twoD. two and four |
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Answer» `H_2C=CH_2+Br_2rarrBrH_2C-CH_2Br` `HC-=CH+2Br_2-H-underset(br)underset(|)overset(Br)overset(|)C-underset(br)underset(|)overset(Br)overset(|)C-H` One mole of cthcnc requires one mole of bromine and one mole of ethyne requires two moles of bro mine for Decolourisation |
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| 221. |
I. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-H` II. `CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-CH_(3)` III. `CH_(3)-CH_(2)-underset(O)underset(||)(C)-CH_(2)-CH_(3)` IV. `{:(CH_(3)-CH-CH_(2)-C-H),(" |"" ||"),(" "CH_(3)" "O):}` Which of the following pairs are position isomers ?A. I and IIB. II and IIIC. II and IVD. III and IV |
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Answer» Correct Answer - B II and III are position isomers since they differ in the position of the C = O group. |
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| 222. |
Electrophiles are electron seeking species. Which of the following groups contain only electrophiles ?A. `BF_(3), NH_(3), H_(2)O`B. `AlCl_(3), SO_(3), NO_(2)^(+)`C. `NO_(2)^(+), CH_(3)^(+), CH_(3)-overset(+)(C) = O`D. `C_(2)H_(5)^(-), overset(*)(C_(2))H_(5), C_(2)H_(5)^(+)` |
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Answer» Correct Answer - B::C (b) `AlCl_(3), SO_(3), overset(+)(N)O_(2)` and `NO_(2)^(+), overset(+)(C)H_(3), CH_(3)-overset(+)(C) = O`. In option (a), `NH_(3)` and `H_(2)O` are nucleophiles whereas `BF_(3)` is an electrophilic while in option (d) `C_(2)H_(5)^(-)` is a nucleophile while `overset(*)(C_(2))H_(5)` and `C_(2)H_(5)^(+)` are electrophiles. |
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| 223. |
Which of the following compounds contain all the carbon atoms in the same hybridisation state ?A. `H-C -= C-C-=C-H`B. `CH_(3)-C-=C-CH_(3)`C. `CH_(2)=C=CH_(2)`D. `CH_(2)=CH-CH=CH_(2)` |
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Answer» Correct Answer - A::D (a) `H - overset(sp)(C) -=overset(sp)(C)-overset(sp)(C)-=overset(sp)(C)-H` (b) `overset(sp^(3))(C)H_(3)-overset(sp)(C)-=overset(sp)(C)-overset(sp^(3))(C)H_(3)` (c) `overset(sp^(2))(C)H_(2)=overset(sp)(C)=overset(sp^(2))(C)H_(2)` (d) `overset(sp^(2))(C)H_(2) =overset(sp^(2))(C)H-overset(sp^(2))(C)H = overset(sp^(2))(C)H_(2)` |
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| 224. |
The reaction, `(CH_(3))_(3)C-Br overset(H_(2)O)rarr (CH_(3))_(3)C-OH` isA. elimination reactionB. substitution reactionC. free radical reactionD. addition reaction. |
| Answer» Correct Answer - B | |
| 225. |
A mixture of o-nitrophenol and p-nitrophenol can be separated byA. sublimationB. steam distillationC. fractional crystallizationD. simple distillation |
| Answer» Correct Answer - B | |
| 226. |
Which of the following has greater enol content than keto counterpart?A. `C_(6)H_(5)-CH_(2)CHO`B. `CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`C. D. |
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Answer» Correct Answer - B It is `1,3`-diketo compound forms stable enol. |
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| 227. |
Which among the following compounds will give maximum enol content in solution?A. `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`B. `CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`C. `CH_(3)-overset(O)overset(||)(C )-CH_(2)-CH_(2)-CH_(3)`D. `CH_(3)-overset(O)overset(||)(C)-CH_(2)-COOC_(2)H_(5)` |
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Answer» Correct Answer - A has strongest active methylene group. |
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| 228. |
In which of the following compound, enol form exists?A. `C_(6)H_(5)COCH_(3)`B. `C_(6)H_(5)CHO`C. D. Both (a) and (c) |
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Answer» Correct Answer - D Both option (a) and option (c) forms enol but option does not form enol. |
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| 229. |
Which of the following has highest `%` enol content in the liquid?A. B. C. D. |
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Answer» Correct Answer - B Has strongest active methylene group and shows chelation in enol form. |
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| 230. |
In which of the followinng compounds the carbon marked with asterisk is expected to have greatest positive charge?A. `overset(***)(C)H_(3)-CH_(2)-Cl`B. `overset(***)(C)H_(3)-CH_(2)-Mg^(+)Cl^(-)`C. `overset(***)(C)H_(3)-CH_(2)-Br`D. `overset(***)(C)H_(3)-CH_(2)-CH_(3)` |
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Answer» Correct Answer - A As Cl is most electronegative element among Cl, M, Br and C thus, it has greater -I effect and the asterisk marked carbon in `.^(***)CH_(3)-CH_(2)-Cl` is expected to have greater positive charge. |
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| 231. |
Correct IUPAC name for `{:(H_(3)C-CH-" "CH-CH_(3)),(" |"" |"),(" "C_(2)H_(5)" "C_(2)H_(5)):}` isA. 2-Ethyl-3-methylpentaneB. 3, 4-DimethylhexaneC. 2-sec-butylbutaneD. 2, 3-Dimethylbutane |
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Answer» Correct Answer - B is the correct IUPAC name |
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| 232. |
Which of the following names is correct for `underset(CHO)underset(|)(C)H_(2)-underset(CHO)underset(|)(C)H-underset(CHO)underset(|)(C)H_(2)`?A. 3-Formylpentane-1,3-dialB. 1,2,3-TriformylpropaneC. 2-Formylmethylbutane-1,4-dialD. Propane-1,2,3-tricarbaldehyde. |
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Answer» Correct Answer - D `underset("3-Formylpentane-1,5-dial or Propane-1,2,3-tricarbaldehyde")(underset(OHC^(5))underset(|)overset(4)(C)H_(2)-underset(CHO)underset(|)overset(3)(C)H-underset(overset(1)(C)HO)underset(|)overset(2)(C)H_(2))` |
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| 233. |
Out of ethylamine and acetamide which is a stronger base and why? |
| Answer» `C_(2)H_(5)NH_(2)` is a stronger base, `CH_(3)-overset(O)overset(||)(C)-NH_(2)` has an electron withdrawing carbonyl group. | |
| 234. |
Species in which all C-C bonds are not equal is/areA. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 235. |
Correct statements among the following is/areA. B. C. D. |
| Answer» Correct Answer - B::C | |
| 236. |
How many total types of products are formed by dehydrohalogenation of 2 chlorobutane? |
| Answer» Correct Answer - 3 | |
| 237. |
Which of the following will have weakest indicated C-H bond?A. B. C. D. `CH_(3)-H` |
| Answer» Correct Answer - C | |
| 238. |
Which of the following compounds will not dissolve in aqueous NaOH?A. B. C. D. |
| Answer» Correct Answer - C | |
| 239. |
Complete combustion of a hydrocarbon gives 0.66 g of `CO_(2)` and 0.36g of `H_(2)O`. Find the empirical formula of the compound. |
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Answer» Let the mass of the substance taken = w g `:. % C = (12)/(44) xx(0.66)/(w) xx 100 = (18)/(w)` and `% H = (2)/(18) xx (0.36)/(w) xx 100 = (4)/(w)` Ratio of atoms, `C : H = (18)/(w) xx (1)/(12) : (4)/(w) xx (1)/(1) = 3 : 8` Hence, E.F. = `C_(3)H_(8)`. |
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| 240. |
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of `CO_(2)`. The empirical formula of the hydrocarbon isA. `C_(7)H_(8)`B. `C_(2)H_(4)`C. `C_(3)H_(4)`D. `C_(6)H_(5)` |
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Answer» Correct Answer - A Let the mass of gaseous hydrocarbon taken = w gm `:. %C = (12)/(44) xx (3.08)/(w) xx 100 = (84)/(w)` `%H = (2)/(18) xx (0.72)/(w) xx 100 = (8)/(w)` Ratio of C : H atoms `= (84)/(w) xx(1)/(12) : (8)/(w) xx (1)/(1) = 7 : 8` Thus, E.F. = `C_(7)H_(8)`. |
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| 241. |
How many metamers of 3-pentanone are possible ? Write their structures and IUPAC names. Can these be regarded as position isomers as well ? |
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Answer» Two metamers (I and II) of 3-pentanone are possible. `underset("3-Pentanone")(CH_(3)CH_(2)-overset(O)overset(||)(C)-CH_(2)CH_(3)) " " underset("2-Pentanone (I)")(CH_(3)-overset(O)overset(||)(C)-CH_(2)CH_(2)CH_(3))` `{:(" "O" "CH_(3)),(" ||"" |"),(CH_(3)-C-CH-CH_(3)),("3-Methyl-2-butanone (II)"):}` Both these can also be regarded as position isomers of 3-pentanone because they differ in the position of the keto group. |
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| 242. |
Which of the following compounds is isomeric with 2,2,4,4-tetramethylhexane?A. 3-ethyl-2,2-dimethylpentaneB. 4-isopropylheptaneC. 4-ethyl-3-methyl-4-n-propyloctaneD. 4,4-diethyl-3-methylheptane |
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Answer» Correct Answer - B `underset("2,2,4,4-tetramethylhexane")(H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-H_(2)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-H_(2)C-CH_(3))` is isomeric with 4-isopropylheptane. |
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| 243. |
Point out incorrect statement about resonanceA. Resonance structures should have equal energyB. In resonance structures, the constituent atoms must be in the same positionC. In resonance structures, there should not be same number of electron pairsD. Resonance structures should differ only in the location of electrons around the constituent atoms. |
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Answer» Correct Answer - C Refer Comprehensive Review. |
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| 244. |
Point out the incorrect statement about resonance?A. Resonance structures should have equal energyB. In resonance structures, the contituent atoms must be in the same positionC. In resonance structures, there should not be same number of electoron pairsD. Resonance structures should differ only in the location of electrons around the constituent atoms. |
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Answer» Correct Answer - C The resonating structures should have same number of electron pairs. |
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| 245. |
Electrophilies are electron seeking species. Which of the following groups contain only electrophiles ?A. `BF_(3), NH_(3), H_(2)O`B. `AlCl_(3), SO_(3), NO_(2)^(+)`C. `NO_(2)^(+), CH_(3)^(+), CH_(3)- overset(+)(C)=O`D. `C_(2)H_(5)^(-), overset(*)(C)_(2)H_(5), C_(2)H_(5)^(+)` |
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Answer» Correct Answer - B::C (b) and (c) represent groups of all electrophiles. |
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| 246. |
Write the hybridised state of carbon in the following compounds and shapes of each of each of the molecules. (a) `H_(2)C=O` (b) `CH_(3)F` (c ) `H-C-=N` |
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Answer» (a) `sp^(2)` hybridised carbon, trigonal planar, (b) `sp^(3) hybridised carbon, tetrahedral, (c) sp hybridised carbon, linear. |
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| 247. |
Among the following structures `I` to `IV`, it is true that: `(I) C_(2)H_(5)-overset(CH_(3))overset(|)CH-C_(3)H_(7), (II) CH_(3)-overset(O)overset(||)C-overset(CH_(3))overset(|)CH-C_(2)H_(5)` `(III) H-overset(H)overset(|)underset(H)underset(|)C^(+), (IV) C_(2)H_(5)-overset(CH_(3))overset(|)CH-C_(2)H_(5)`A. Only `(III)` is ChiralB. Only `(II)` and `(IV)` are ChiralC. All four are ChiralD. Only `(I)` and `(II)` are Chiral |
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Answer» Correct Answer - C `CH_(3)-overset(O)overset(||)(C)-overset(CH_(3))overset(|)(CH)-C_(2)H_(5)` and `C_(2)H_(5)-overset(CH_(3))overset(|)(CH)-C_(3)H_(7)` |
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| 248. |
The hybridisation of N is correctly given inA. `sp^(3)` in acetamideB. `sp^(2)` in pyridineC. `sp^(2)` in pyrroleD. sp in methyl cyanide |
| Answer» Correct Answer - B::C::D | |
| 249. |
Which of the following compounds will have highest enolic content?A. B. `CH_(3)COCH_(2)Cho`C. `CH_(3)CHO`D. `CH_(3)COCH_(3)` |
| Answer» Correct Answer - A | |
| 250. |
The IUPAC name for `CH_(3)CH_(2)CH (CH = CH_(2)) CH_(2)CH_(2)CH_(3)` isA. 4-EthenylheptaneB. 3-n-propylhex-1-eneC. 3-EthenylheptaneD. None of these |
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Answer» Correct Answer - B `{:(CH_(3)CH_(2)CH_(2)-overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)H_(2)-overset(6)(C)H_(3)),(" |"),(" "._(2)CH=underset(1)(C)H_(2)):}` 3-n-propylhex-1-ene |
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