Hydrocarbons PYQs Set 6 (PDF)

Set 6 of 15 · Questions 151-180 of 435

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrocarbons · Set 6 (Q151-180)
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151. $When n -hexane is heated with anhydrous AlCl_{3} and HCl gas, the major product(s) obtained is/are$ (1) $mixture of 2-methylpentane and 3-methylpentane$ (2) $2-chlorohexane$ (3) $3-chlorohexane$ (4) $hex-3-ene.$ 152. $Benzene reacts with n -propyl chloride in the presence of anhydrous AlCl_{3} to give predominantly$ (1) $n -propyl benzene$ (2) $isopropyl benzene .$ (3) $3-propyl-1-chloro benzene$ (4) $1-chloro-3-n-propyl benzene$ 153. $Which of the following compounds is most basic ?$ (1) (2) (3) (4) $None of these$ 154. $An unsaturated hydrocarbon X on ozonolysis gives A . Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon X is:$ (1) $C H_{3} - C (C H_{3}) = C (C H_{3}) - C H_{3}$ (2) (3) $HC \equiv C - CH_{2} - CH_{3}$ (4) $CH_{3} - C \equiv C - CH_{3}$ 155. $In the hydrocarbon, The state of hybridization of carbons 1, 3 and 5 are in the following sequence$ (1) $s p, s p^{2}, s p^{3}$ (2) $s p^{3}, s p^{2}, s p$ (3) $s p^{2}, s p, s p^{3}$ (4) $s p, s p^{3}, s p^{2}$ 156. $Find out the hybridisations of C_{1}, C_{2} and C_{3} labelled carbon atoms in the given molecule$ (1) $C_{1} C_{2} C_{3} sp s p^{2} s p^{2}$ (2) $C_{1} C_{2} C_{3} sp s p^{2} sp$ (3) $C_{1} C_{2} C_{3} s p^{2} sp sp$ (4) $C_{1} C_{2} C_{3} s p^{2} s p^{2} s p^{2}$ 157. $Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose the correct answer from the options given below$ (1) $C<D<E<A<B$ (2) $D<B<E<A<C$ (3) $D<C<E<A<B$ (4) $C<D<E<B<A$ 158. $A compound 'X' on treatment with B r_{2} /NaOH, provided C_{3} H_{9} N, which gives positive cabylamine test. Compound 'X' is$ (1) $C H_{3} C O C H_{2} N H C H_{3}$ (2) $C H_{3} CON (C H_{3})_{2}$ (3) $C H_{3} C H_{2} C O C H_{2} N H_{2}$ (4) $C H_{3} C H_{2} C H_{2} C O N H_{2}$ 159. $Which of the following compounds will form significant amount of meta product during mono-nitration reaction ?$ (1) (2) (3) (4) 160. $Identify Z in the sequence of reactions : CH_{3} CH_{2} CH = CH_{2} HBr H_{2} O_{2} Y C_{2} H_{5} ONa Z$ (1) $CH3-(CH2)3-O-CH2CH3$ (2) $(CH3)2CH2-O-CH2CH3$ (3) $CH3(CH2)4-O-CH3$ (4) $CH3CH2-CH(CH3)-O-CH2CH3$ 161. $Dihedral angle (D.A.) of least stable conformer of ethane is$ (1) $120^{\circ}$ (2) $180^{\circ}$ (3) $60^{\circ}$ (4) $0^{\circ}$ 162. $In the above reaction electrophile is substituted at meta position only, due to I. Electron density is more at ortho & para position II. Electron density is relatively less at ortho & para position III. Electron density is less at meta position IV. Electron density is relatively more at meta position Correct answer is$ (1) $I, III only$ (2) $II, IV only$ (3) $1 only$ (4) $III only$ 163. $2-Butyne is reduced to trans-but-2-ene using$ (1) $H_{2} / Ni$ (2) $Na in liq. NH_{3}$ (3) $H_{2} / Pd - C$ (4) $Zn in dil. HCl .$ 164. $Which of the following is a free radical substitution reaction?$ (1) $Acetylene with HBr$ (2) $Methane with Br_{2} / hv$ (3) $Propene with HBr / (C_{6} H_{5} COO)_{2}$ (4) $Benzene with Br_{2} / AlCl_{3}$ 165. $H_{2} + CO + alkene \to catalyst 1^{\circ} alcohol. What is the stable intermediate and the nature of the reaction?$ (1) $Acid, reduction$ (2) $Aldehyde, oxidation$ (3) $Aldehyde, reduction$ (4) $Alcohol, oxidation$ 166. $Which of the following compound is most reactive in electrophilic aromatic substitution?$ (1) $nitrobenzene$ (2) $benzene$ (3) $phenol$ (4) $chlorobenzene$ 167. $Which of the following is not obtained when a mixture of methyl chloride and n -propyl chloride is treated with sodium metal in dry ether?$ (1) $Ethane$ (2) $Propane$ (3) $Butane$ (4) $Hexane$ 168. $The reaction, C H_{2} = C H - C H_{3} + H B r \to C H_{3} C H B r - C H_{3} is$ (1) $electrophilic substitution$ (2) $free radical addition$ (3) $nucleophilic addition$ (4) $electrophilic addition.$ 169. $The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is :$ (1) $I < IV < II < III$ (2) $I < IV < III < II$ (3) $I < III < II < IV$ (4) $I < III < IV < II$ 170. $The correct order of rates of addition of Br_{2} / water to the following alkenes is [A] CH_{2} = CH_{2} [B] CH_{2} = CH - NO_{2} [C] CH_{3} - CH_{2} - CH = CH_{2} [D]$ (1) $[D] > [C] > [A] > [B]$ (2) $[D] > [C] > [B] > [A]$ (3) $[A] > [B] > [C] > [D]$ (4) $[A] > [B] > [D] > [C]$ 171. $Compound X on reaction with O_{3} followed by Zn / H_{2} O gives formaldehyde and 2-methyl propanal as products. The compound X is:$ (1) $Pent-2-en$ (2) $3-Methylbut-1-ene$ (3) $2-Methylbut-1-ene$ (4) $2-Methylbut-2-ene$ 172. $Identify the major product B in the given sequence of reactions CH_{3} - C \equiv CH H_{2} Pd/C A (C_{6} H_{5} CO)_{2} O_{2} HBr B$ (1) $C H_{3} - C H (B r) - C H_{3}$ (2) $CH_{3} - CH_{2} - CH_{2} Br$ (3) $C H_{3} - C H (B r) - C H_{2} B r$ (4) $CH_{3} - CH_{2} - CHBr_{2}$ 173. $Nitration of aniline in strong acidic medium also given m-nitroaniline because$ (1) $In spite of substituents nitro group always goes to only m-position.$ (2) $In acidic (strong) medium aniline is present as anilinium ion.$ (3) $In absence of substituents nitro group always goes to m-position.$ (4) $In electrophilic substitution reactions amino group is meta directive.$ 174. $The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with O H^{-} is$ (1) (2) (3) (4) 175. $Given below are two statements: Statement- I : 2 -methylbutane on oxidation with KMnO_{4} gives 2 -methylbutan- 2 - o 1 . Statement- II : n -alkanes can be easily oxidised to corresponding alcohol with KMnO_{4} . Choose the correct option:$ (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) $Statement I is incorrect but Statement II is correct$ 176. $Identify the following compound which exhibits geometrical isomerism.$ (1) $But-2-ene$ (2) $But-1-ene$ (3) $Butane$ (4) $Iso-butane$ 177. $Identify the correct statements for a ring system to exhibit aromaticity (I) It must not be planar. (II) It must possess (4 n + 2) π -electrons. (III) It must be planar. (IV) It must possess 4 nπ -electrons. The correct answer is$ (1) $II, IV$ (2) $I, II$ (3) $I, IV$ (4) $II, III$ 178. $Which of the following reagent is used to find out carbon-carbon multiple bonds?$ (1) $Grignard reagent$ (2) $Baeyer's reagent$ 179. $Ethyl benzene cannot be prepared by$ (1) $Wurtz reaction$ (2) $Wurtz-Fittig reaction$ (3) $Friedel-Crafts reaction$ (4) $Clemmensen reduction.$ 180. $The major product of the following addition reaction is H_{3} C - CH = C H_{2} C l_{2} / H_{2} O$ (1) $H_{3} C - C H (O H) - C H_{2} (C l)$ (2) $H_{3} C - C H (O H) - C H_{2} (C l)$ (3) (4) $H_{3} C - C (= O) - C H_{3}$