Haloalkanes & Haloarenes PYQs Set 7 (PDF)

Set 7 of 10 · Questions 181-210 of 272

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Haloalkanes & Haloarenes · Set 7 (Q181-210)
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181. $The major product of the following reaction is CH_{2} = CH - CH_{2} - OH \to HBr Excess Product$ (1) $CH_{3} - CHBr - CH_{2} Br$ (2) $CH_{2} = CH - CH_{2} Br$ (3) $CH_{3} - CHBr - CH_{2} - OH$ (4) $CH_{3} - CHOH - CH_{2} OH$ 182. $An incorrect statement with respect to S_{N} 1 and S_{N} 2 mechanisms for alkyl halide is$ (1) $a strong nucleophile in an aprotic solvent increases the rate or favours S_{N} 2 reaction$ (2) $competing reaction for an S_{N} 2 reaction is rearrangement$ (3) $S_{N} 1 reactions can be catalysed by some Lewis acids$ (4) $a weak nucleophile and a protic solvent increases the rate or favours S_{N} 1 reaction.$ 183. $Cycloalkane formed when 1,4-dibromopentane is heated with sodium is$ (1) $methyl cyclobutane$ (2) $cyclopentane$ (3) $cyclobutane$ (4) $methyl cyclopentane.$ 184. $In assigning R, S -configuration which among the following groups has highest priority?$ (1) $- SO_{3} H$ (2) $- COOH$ (3) $- CHO$ (4) $- C_{6} H_{5}$ 185. $The compound having longest C - Cl bond is$ (1) (2) (3) (4) $CH_{2} = CH - Cl$ 186. $Which of the following reactions is an example of nucleophilic substitution reaction?$ (1) $2 R X + 2 N a \to R - R + 2 N a X$ (2) $R X + H_{2} \to R H + H X$ (3) $R X + M g \to R M g X$ (4) $R X + K O H \to R O H + K X$ 187. $Tertiary alkyl halide is practically inert to substitution by S_{N} 2 mechanism because of$ (1) $insolubility$ (2) $instability$ (3) $inductive effect$ (4) $steric hindrance.$ 188. $The hydrolysis of optically active 2-bromobutane with aqueous NaOH results in the formation of$ (1) $(-)-butan-2-ol$ (2) $(\pm)-butan-2-ol$ (3) $(+)-butan-2-ol$ (4) $(土)-butan-1-ol$ 189. $Chlorination of ethane is carried out in presence of$ (1) $anhydrous AlBr_{3}$ (2) $mercuric chloride$ (3) $ultraviolet light$ (4) $zinc chloride.$ 190. $The arrangement of following compounds: (i) bromomethane (ii) bromoform (iii) chloromethane (iv) dibromomethane In the increasing order of their boiling point is$ (1) $iv < iii < i < ii$ (2) $i < ii < iii < iv$ (3) $iii < i < iv < ii$ (4) $ii < iii < i < iv$ 191. $Reactivity order of halides for dehydrohalo genation is$ (1) $R - F > R - Cl > R - Br > R - I$ (2) $R - I > R - Br > R - Cl > R - F$ (3) $R - I > R - Cl > R - Br > R - I$ (4) $R - F > R - I > R - Br > R - Cl$ 192. $The major product C of the following reaction sequence will be$ (1) (2) (3) (4) 193. $The correct options for the products A and B of the following reactions are :$ (1) (2) (3) (4) 194. $An alkyl bromide (X) reacts with sodium in ether to form 4, 5-diethyloctane, the compound ' X' is$ (1) $CH_{3} (CH_{2})_{3} Br$ (2) $CH_{3} (CH_{2})_{5} Br$ (3) $CH_{3} (CH_{2})_{3} CH (Br) CH_{3}$ (4) $CH_{3} - (CH_{2})_{2} - CH (Br) - CH_{2} - CH_{3}$ 195. $Benzene can be conveniently converted into n -propy? benzene by$ (1) $Friedel-Crafts alkylation with n -propyl chloride$ (2) $Friedel-Crafts acylation with propionyl chloride followed by Wolff-Kishner reduction$ (3) $Friedel-Crafts acylation with propionyl chloride followed by catalytic hydrogenation$ (4) $Friedel-Crafts acylation with propionyl chloride followed by reduction with LiAlH_{4} .$ 196. $Identify X and Y in the following reaction CH_{2} = CH_{2} \to (i) X (ii) Y CH_{3} CH_{2} I$ (1) $HBr, NaI / dry CH_{3} COCH_{3}$ (2) $HBr, I_{2} / dry CH_{3} COCH_{3}$ (3) $Br_{2}, NaI / dry CH_{3} COCH_{3}$ (4) $Br_{2}, I_{2} / dry CH_{3} COCH_{3}$ 197. $The products A and B in the following reactions, respectively are A ⟷ Ag - NO_{2} CH_{3} - CH_{2} CH_{2} - Br \to AgCN B$ (1) $CH_{3} - CH_{2} - CH_{2} - NO_{2}, CH_{3} - CH_{2} - CH_{2} - CN$ (2) $CH_{3} - CH_{2} - CH_{2} - ONO, CH_{3} - CH_{2} - CH_{2} - NC$ (3) $CH_{3} - CH_{2} - CH_{2} - ONO, CH_{3} - CH_{2} - CH_{2} - CN$ (4) $CH_{3} - CH_{2} - CH_{2} - NO_{2}, CH_{3} - CH_{2} - CH_{2} - NC$ 198. $In S_{N} 2 reaction, the carbon in the transition state is$ (1) $Tri coordinated$ (2) $Penta coordinated$ (3) $Tetra coordinated$ (4) $Hexa coordinated$ 199. $The major product of the following reaction is : (i) aq . NaOH (ii) C H_{3} I$ (1) (2) (3) (4) 200. $Heating of 2 -chloro- 1 -phenylbutane with EtOK / EtOH gives X as the major product. Reaction of X with Hg (OAc)_{2} / H_{2} O followed by NaBH_{4} gives Y as the major product. Y is:$ (1) (2) (3) (4) 201. $Which of the following compounds has zero dipole moment?$ (1) $1,4-dichlorobenzene$ (2) $1,2-dichlorobenzene$ (3) $1,3-dichlorobenzene$ (4) $1-chloro-2-methyl benzene$ 202. $A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is$ (1) $1,1-dibromopropane$ (2) $2,2-dibromobutane$ (3) $1,2-dibromoethane$ (4) $1,4-dibromobutane.$ 203. $1,2-dibromocyclooctane (i) KOH (alc .) (ii) Na NH_{2} (iii) \frac{Hg ^{2 +}}{H ^{+}} (iv) Zn - Hg / H^{+} P major product'P' is$ (1) (2) (3) (4) 204. $1-methyl-ethylene oxide \frac{excess}{HBr} X Product ’ X^{’} will be$ (1) (2) (3) (4) 205. $Which one of the following reactions will not lead to the desired ether formation in major proportion? (iso- Bu \Rightarrow isobutyl, sec- Bu \Rightarrow sec-butyl, nPr \Rightarrow n-propyl,^{t} Bu \Rightarrow tert-butyl, Et \Rightarrow ethyl)$ (1) (2) $iso- Bu O Na + + sec - BuBr ⟶ sec- Bu - O - iso -Bu$ (3) (4) $^{t} Bu O N + a + EtBr \to^{t} Bu - O - Et$ 206. $Assertion (A) : S_{N} 1 hydrolysis of optically active 2-bromooctane results in the formation of ( \pm ) - octane -2 -ol.Reason (R) : The reaction proceeds through a planar carbocation which can be attacked by the nucleophile from either side.The correct answer is$ (1) $(A) and (R) are correct, (R) is the correct explanation of (A)$ (2) $(A) and (R) are correct but (R) is not the correct explanation of (A)$ (3) $(A) is correct but (R) is not correct$ (4) $(A) is not correct but (R) is correct$ 207. $The major product obtained in the reaction of bromobenzene with Mg in dry ether followed by the reaction with benzonitrile and hydrolysis is$ (1) $acetophenone$ (2) $benzophenone$ (3) $phenyl benzoate$ (4) $benzoic acid$ 208. $In the following reaction, C_{6} H_{5} CH_{2} Br 1. Mg, Ether 2. H_{3} O^{+} X, the product‘ X ’ is$ (1) $C_{6} H_{5} C H_{2} O C H_{2} C_{6} H_{5}$ (2) $C_{6} H_{5} C H_{2} O H$ (3) $C_{6} H_{5} C H_{3}$ (4) $C_{6} H_{5} C H_{2} C H_{2} C_{6} H_{5}$ 209. $The major product of the following reaction is : AlCl_{3}, ∆$ (1) (2) (3) (4) 210. $In the following sequence of reaction, the major products B and C respectively are :$ (1) (2) (3) (4)