Hydrocarbons PYQs Set 9 (PDF)

Set 9 of 16 · Questions 241-270 of 459

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrocarbons · Set 9 (Q241-270)
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241. $Acetylene and dil. H2SO4 reacts to produce :$ (1) $CH3COOH$ (2) $CH3CHO$ (3) $CH3COCH3$ (4) $None of these$ 242. $The state of hybridisation of C_{2}, C_{3}, C_{5} and C_{6} of the hydrocarbon, is in the following sequence$ (1) $s p^{3}, s p^{2}, s p^{2} and s p$ (2) $s p, s p^{2}, s p^{2} and s p^{3}$ (3) $s p, s p^{2}, s p^{3} and s p^{2}$ (4) $s p, s p^{3}, s p^{2} and s p^{3}$ 243. $Identify products A and B dil . KMn O_{4} 273 K A Cr O_{3} B$ (1) (2) (3) $A: O \| \| OHC - C H_{2} C H_{2} C H_{2} - C - C H_{3} B: O \| \| HOOC - C H_{2} C H_{2} C H_{2} - C - C H_{3}$ (4) 244. $The reactive species in the nitration of benzene is$ (1) $N O_{3}$ (2) $H N O_{3}$ (3) $N O_{2}^{+}$ (4) $N O_{2}^{-}$ 245. $Structural formula of Lewisite is :$ (1) $C H C l = C H A s C l_{3}$ (2) $C H C l = C H A s C l$ (3) $C H C l = C H A s C l_{2}$ (4) $C H_{2} = C H A s C l_{2}$ 246. $Final Product of given reaction :$ (1) (2) (3) (4) 247. $The correct statement is$ (1) $cyclohexadiene and cyclohexene cannot be isolated with ease during controlled hydrogenation of benzene$ (2) $one mole each of benzene and hydrogen when reacted gives 1/3 mole of cyclohexane and 2/3 mole unreacted hydrogen$ (3) $hydrogenation of benzene to cyclohexane is an endothermic process$ (4) $it is easier to hydrogenate benzene when compared to cyclohexene$ 248. $The following effect is known as$ (1) $inductive effect$ (2) $electromeric effect$ (3) $resonance effect$ (4) $hyperconjugation$ 249. $Electrophile that participates in nitration of benzene is$ (1) $NO^{+}$ (2) $NO_{2}^{+}$ (3) $NO$ (4) $NO_{3}^{-}$ 250. $The compound that will react most readily with gaseous bromine has the formula$ (1) $C_{3} H_{6}$ (2) $C_{2} H_{2}$ (3) $C_{4} H_{10}$ (4) $C_{2} H_{4}$ 251. $Which of the following has zero dipole moment?$ (1) $1‐Butene$ (2) $2‐Methyl‐l‐propene$ (3) $cis‐2‐Butene$ (4) $trans‐2‐Butene$ 252. $Which of the following compound is formed when CH2=CH(CH2)2 COOH react with HBr ?$ (1) $CH3CHCH2CH2BrCOOH$ (2) $CH3CHBrCH2CH2COOH$ (3) $CH2BrCH2(CH2)2COOH$ (4) $CH3CH2CH2BrCH2COOH$ 253. $Acetone can easily be converted into propane by the action of :$ (1) $HΙ$ (2) $H3PO3$ (3) $HNO3$ (4) $HΙO3$ 254. $In acetylene molecule, between the carbon atoms there are$ (1) $three pi bonds$ (2) $one sigma and two pi bonds$ (3) $two sigma and one pi bonds$ (4) $three sigma bonds.$ 255. $Which one of the following on reduction with LiAlH4 yields a secondary amine?$ (1) $Methyl isocyanide$ (2) $Acetamide$ (3) $Methyl cyanide$ (4) $Nitroethane$ 256. $Electrolytic reduction of nitrobenzene in weakly acidic medium gives.$ (1) $aniline$ (2) $nitrosobenzene$ (3) $N-phenyl hydroxylamine$ (4) $p-hydroxyaniline$ 257. $Given below are two statements. Statement I : The presence of weaker π bonds make alkenes less stable than alkanes. Statement II : The strength of the double bond is greater than that of carbon-carbon single bond. choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are correct.$ (2) $Both Statement I and Statement II are incorrect.$ (3) $Statement I is correct but Statement II is incorrect.$ (4) $Statement I is incorrect but Statement II is correct.$ 258. $In Sandmeyer’s reaction the salt involved is :$ (1) $Diazonium salt$ (2) $Cupramonium salt$ (3) $Ferrous salt$ (4) $Ammonium salt$ 259. $Which of the following reagent is used to distinguish phenol and benzoic acid ?$ (1) $Aqueous NaOH$ (2) $Tollen's reagent$ (3) $Molisch reagent$ (4) $Neutral F e C_{l 3}$ 260. $The type of isomerism observed in urea molecule is :$ (1) $chain$ (2) $position$ (3) $geometrical$ (4) $tautomerism$ 261. $An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is$ (1) $t-butyl chloride$ (2) $s-butyl chloride$ (3) $iso-butyl chloride$ (4) $n-butyl chloride$ 262. $Using anhydrous AlCl3 as catalyst, which one of the following reaction produce ethylbenzene (PhEt)?$ (1) $H3C - CH2OH + C6H6$ (2) $CH3 - CH = CH2 + C6H6$ (3) $C2H5Cl + C6H6$ (4) $H3C - CH3 + C6H6$ 263. $Which of the following gives propyne on hydrolysis?$ (1) $Al4 C3$ (2) $Mg2C3$ (3) $B4C$ (4) $La4C3$ 264. $In the reaction, 2 nR - X \to + 2 n Na Dry ether product, the product obtained is$ (1) $2 n Alkene$ (2) $n Sodium halide$ (3) $n Alcohol$ (4) $n Alkane$ 265. $The electrophile, E^{\oplus} . attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy ?$ (1) (2) (3) (4) 266. $Which one of the following cannot be prepared by Wurtz reaction ?$ (1) $CH4$ (2) $C2H6$ (3) $C3H8$ (4) $C4H10$ 267. $Which of the following is not an example of benzenoid compound ?$ (1) (2) (3) (4) 268. $The compound which is obtained by treating chloropropane with alcoholic KOH, when reacts BH3/THF followed by acetic acid gives :$ (1) $CH3CH2CH2OH$ (2) $CH3CH2CH3$ (3) $CH3CH(OH)CH3$ (4) $CH3CH2CHOHCH3$ 269. $With ammoniacal cuprous chloride solution a reddish brown precipitate is obtained on treating with :$ (1) $CH4$ (2) $C2 H4$ (3) $C2 H2$ (4) $C3 H6$ 270. $Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light? C H_{3} - C H_{2} -CH= C H_{2} δ γ β α (E)$ (1) $α-hydrogen$ (2) $γ-hydrogen$ (3) $β-hydrogen$ (4) $δ-hydrogen$