Hydrocarbons PYQs Set 9 (PDF)

Set 9 of 15 · Questions 241-270 of 435

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrocarbons · Set 9 (Q241-270)
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241. $Which one of the following on reduction with LiAlH4 yields a secondary amine?$ (1) $Methyl isocyanide$ (2) $Acetamide$ (3) $Methyl cyanide$ (4) $Nitroethane$ 242. $Electrolytic reduction of nitrobenzene in weakly acidic medium gives.$ (1) $aniline$ (2) $nitrosobenzene$ (3) $N-phenyl hydroxylamine$ (4) $p-hydroxyaniline$ 243. $Given below are two statements. Statement I : The presence of weaker π bonds make alkenes less stable than alkanes. Statement II : The strength of the double bond is greater than that of carbon-carbon single bond. choose the correct answer from the options given below.$ (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) $Statement I is incorrect but Statement II is correct.$ 244. $In Sandmeyer’s reaction the salt involved is :$ (1) $Diazonium salt$ (2) $Cupramonium salt$ (3) $Ferrous salt$ (4) $Ammonium salt$ 245. $Which of the following reagent is used to distinguish phenol and benzoic acid ?$ (1) $Aqueous NaOH$ (2) $Tollen's reagent$ (3) $Molisch reagent$ (4) $Neutral F e C_{l 3}$ 246. $The type of isomerism observed in urea molecule is :$ (1) $chain$ (2) $position$ (3) $geometrical$ (4) $tautomerism$ 247. $An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is$ (1) $t-butyl chloride$ (2) $s-butyl chloride$ (3) $iso-butyl chloride$ (4) $n-butyl chloride$ 248. $Using anhydrous AlCl3 as catalyst, which one of the following reaction produce ethylbenzene (PhEt)?$ (1) $H3C - CH2OH + C6H6$ (2) $CH3 - CH = CH2 + C6H6$ (3) $C2H5Cl + C6H6$ (4) $H3C - CH3 + C6H6$ 249. $Which of the following gives propyne on hydrolysis?$ (1) $Al4 C3$ (2) $Mg2C3$ (3) $B4C$ (4) $La4C3$ 250. $In the reaction, 2 nR - X \to + 2 n Na Dry ether product, the product obtained is$ (1) $2 n Alkene$ (2) $n Sodium halide$ (3) $n Alcohol$ (4) $n Alkane$ 251. $The electrophile, E^{\oplus} . attacks the benzene ring to generate the intermediate σ-complex. Of the following, which σ-complex is of lowest energy ?$ (1) (2) (3) (4) 252. $Which one of the following cannot be prepared by Wurtz reaction ?$ (1) $CH4$ (2) $C2H6$ (3) $C3H8$ (4) $C4H10$ 253. $Which of the following is not an example of benzenoid compound ?$ (1) (2) (3) (4) 254. $The compound which is obtained by treating chloropropane with alcoholic KOH, when reacts BH3/THF followed by acetic acid gives :$ (1) $CH3CH2CH2OH$ (2) $CH3CH2CH3$ (3) $CH3CH(OH)CH3$ (4) $CH3CH2CHOHCH3$ 255. $With ammoniacal cuprous chloride solution a reddish brown precipitate is obtained on treating with :$ (1) $CH4$ (2) $C2 H4$ (3) $C2 H2$ (4) $C3 H6$ 256. $Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light? C H_{3} - C H_{2} -CH= C H_{2} δ γ β α (E)$ (1) $α-hydrogen$ (2) $γ-hydrogen$ (3) $β-hydrogen$ (4) $δ-hydrogen$ 257. $Conversion of benzene diazonium chloride to chloro benzene is an example of which of the following reactions?$ (1) $Claisen$ (2) $Friedel-craft$ (3) $Sandmeyer$ (4) $Wurtz$ 258. $Complete reduction of benzene-diazonium chloride with Zn/HCl gives$ (1) $Aniline$ (2) $Phenylhydrazine$ (3) $Azobenzene$ (4) $Hydrazobenzene$ 259. $Which of the following sequence of reactions (reagents) can be used for the conversion of C6H5CH2CH3 into C6H5CH = CH2?$ (1) $SOCl2 ; H2O$ (2) $SO2Cl2 ; alc. KOH$ (3) $Cl2 / hν ; H2O$ (4) $SOCl2 ; alc. KOH$ 260. $Propan-1-ol may be prepared by reaction of propene with$ (1) $C H_{3} - C (= O) - O - O - H$ (2) $H3BO3$ (3) $B2H6/NaOH-H2O2$ (4) $H2SO4/H2O$ 261. $Among the following alkenes, 1-butene cis-2-butene trans-2-butene I II III the decreasing order of stability is :$ (1) $II > I > III$ (2) $III > II > I$ (3) $III > I > II$ (4) $I > II > III$ 262. $Nitrobenzene given N-phenylhydroxylamine by :$ (1) $Sn/HCl$ (2) $H2/Pd-C$ (3) $Zn/NaOH$ (4) $Zn/NH4Cl$ 263. $Toluene reacts with halogen in presence of iron (III) chloride giving ortho and parahalo compounds. The reaction is$ (1) $free radical addition reaction$ (2) $electrophilic elimination reaction$ (3) $nucleophilic substitution reaction$ (4) $electrophilic substitution reaction.$ 264. $Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains :$ (1) $mixture of o- and p-dibromobenzenes$ (2) $mixture of o- and p-bromoanilines$ (3) $mixture of o- and m-bromotoluenes$ (4) $mixture of o- and p-bromotoluenes$ 265. $Aniline is prepared in presence of Fe/HCl from :$ (1) $benzene$ (2) $nitrobenzene$ (3) $dinitrobenzene$ (4) $none of these$ 266. $Formation of alcohol by oxymercuration demercuration of alkenes :$ (1) $Involves carbocations and rearrangement$ (2) $Involves carbanions and rearrangement$ (3) $Is stereospecific$ (4) $Does not involve rearrangement and carbocation$ 267. $Identify product A and product B :$ (1) (2) (3) (4) 268. $The correct structure of 2,6-Dimethyl-dec-4-ene.$ (1) (2) (3) (4) 269. $Compound A formed in the following reaction reacts with B gives the product C . Find out A and B .$ (1) $A = CH_{3} - C \equiv CNa, B = CH_{3} - CH_{2} - CH_{2} - Br$ (2) $A = CH_{3} - CH = CH_{2}, B = CH_{3} - CH_{2} - CH_{2} - Br$ (3) $A = CH_{3} - CH_{2} - CH_{3}, B = CH_{3} - C \equiv CH$ (4) $A = CH_{3} - C \equiv C^{+} a, B = CH_{3} - CH_{2} - CH_{3}$ 270. $2- Hexyne gives trans -2-Hexene on treatment with :$ (1) $Pt/H2$ (2) $Li / NH3$ (3) $Pd/BaSO4$ (4) $Li AlH4$