Haloalkanes & Haloarenes PYQs Set 4 (PDF)

Set 4 of 9 · Questions 91-120 of 261

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Mere Teacher · Previous Year Questions NEET Chemistry · Haloalkanes & Haloarenes · Set 4 (Q91-120)
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91. $obtained by Cl chlorination of n ‐butane will be$ (1) $meso form$ (2) $racemic mixture$ (3) $d ‐form$ (4) $l ‐form$ 92. $A compound A contains C and H only and has molecular mass 72. It's photochlorination gives a mixture containing only one monochloro and two dichloro hydrocarbons. The IUPAC name is$ (1) $2, 2-dimethylpropane$ (2) $n -pentane$ (3) $2-methyl butane$ (4) $cyclopentane$ 93. $In the following reaction the reason why meta-nitro product also formed is:$ (1) $Formation of anilinium ion$ (2) $- N O_{2} substitution always takes place at meta-position$ (3) $Low temperature$ (4) $- NH_{2} group is highly meta-directive$ 94. $Replacement of C l of chlorobenzene to give phenol requires drastic conditions. But chlorine of 2,4‐dinitrochlorobenzene is readily replaced because$ (1) $N O_{2} donates e^{-} at meta position$ (2) $N O_{2} withdraws e^{-} from ortholpara positions$ (3) $N O_{2} make ring electron rich at ortho and para$ (4) $N O_{2} withdraws e^{-} from meta position.$ 95. $Which of the following potential energy (PE) diagrams represents the S_{N} 1 reaction?$ (1) (2) (3) (4) 96. $How many optically active stereomers are possible for butane-2, 3-diol?$ (1) $3$ (2) $4$ (3) $1$ (4) $2$ 97. $The major product of the following reaction is : (i) alkaline KMn O_{4} (ii) H_{3} O^{+}$ (1) (2) (3) (4) 98. $Given below are two statements: Statement I: CH_{3} - O - CH_{2} - Cl will undergo S_{N} 1 reaction though it is a primary halide. Statement II: will not undergo S_{N} 2 reaction very easily though it is a primary halide. choose the most appropriate answer from the options given below:$ (1) $Both Statement I and Statement II are incorrect$ (2) $Both Statement I and Statement II are correct$ (3) $Statement I is incorrect but Statement II is correct$ (4) $Statement I is correct but Statement II is incorrect$ 99. $An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options: Assertion (A) : Vinyl halides do not undergo nucleophilic substitution easily. Reason (R) : Even though the intermediate carbocation is stabilized by loosely held π -electrons, the cleavage is difficult because of strong bonding.$ (1) $Both (A) and (R) are wrong statements$ (2) $Both (A) and (R) are correct statements and (R) is the correct explanation of (A) .$ (3) $Both (A) and (R) are correct statements but (R) is not the correct explanation of (A) .$ (4) $(A) is a correct statement but (R) is a wrong statement.$ 100. $The correct order of reactivity of the following benzyl halides towards reaction with KCN is: (A) 4-hydroxybenzyl bromide (B) 4-aminobenzyl bromide (C) 4-nitrobenzyl bromide (D) 3-nitrobenzyl bromide$ (1) $(B) > (A) > (C) > (D)$ (2) $(B) > (A) > (D) > (C)$ (3) $(A) > (B) > (D) > (C)$ (4) $(A) > (B) > (C) > (D)$ 101. $Arrange the following in correct order towards S_{N} 2 reaction. 1 - Chloropropane 2-Chloropropane I II 1 -Iodopropane 2 - Iodopropane III IV$ (1) $III > I > IV > II$ (2) $III > IV > I > II$ (3) $I > II > III > IV$ (4) $I > III > II > IV$ 102. $The compound that will undergo S_{N} 1 reaction with the fastest rate is [NEET 2024]$ (1) (2) (3) (4) 103. $Which one of the following is likely to give a precipitate with AgNO_{3} solution?$ (1) $CH_{2} = CH - Cl$ (2) $CCl_{4}$ (3) $CHCl_{3}$ (4) $(CH_{3})_{3} CCl$ 104. $The decreasing order of reactivity towards dehydrohalogenation (E_{1}) reaction of the following compounds is:$ (1) $C > B > D > A$ (2) $D > B > C > A$ (3) $B > C > D > A$ (4) $A > B > C > D$ 105. $Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light? CH_{3} δ - CH_{2} γ - CH β = CH_{2} α$ (1) $α - hydrogen$ (2) $γ - hydrogen$ (3) $δ - hydrogen$ (4) $β - hydrogen$ 106. $For the reaction RC H_{2} Br + I^{-} Acetone RC H_{2} I major + B r^{-} The correct statement is$ (1) $B r^{-} can act as competing nucleophile.$ (2) $The reaction can occur in acetic acid also.$ (3) $The transition state formed in the above reaction is less polar than the localised anion.$ (4) $The solvent used in the reaction solvates the ions formed in rate determining step$ 107. $Grignard reagent is prepared by there action between$ (1) $magnesium and alkane$ (2) $magnesium and aromatic hydrocarbon$ (3) $zinc and alkyl halide$ (4) $magnesium and alkyl halide.$ 108. $Which of the following is an optically active compound?$ (1) $1‐Butanol$ (2) $1‐Propanol$ (3) $2‐Chlorobutane$ (4) $4‐Hydroxyheptane$ 109. $The order of reactivity of the following compounds towards dilute aqueous KOH in S_{N} 1 reaction is (i) CH_{3} CH_{2} CH_{2} CH_{2} Br (ii) H_{3} C CH_{2} CHBr CH_{3} (iii) (CH_{3}) CH CH_{2} Br (iv) (CH_{3})_{3} CBr$ (1) $I < IV < III < II$ (2) $IV < II < III < I$ (3) $III < II < I < IV$ (4) $I < III < II < IV$ 110. $What are X and Y in the following reaction sequence?$ (1) (2) (3) (4) 111. $In the above reaction product ' P' is$ (1) (2) (3) (4) 112. $Increasing rate of S_{N} 1 reaction in the following compounds is:$ (1) $(A) < (B) < (C) < (D)$ (2) $(B) < (A) < (C) < (D)$ (3) $(B) < (A) < (D) < (C)$ (4) $(A) < (B) < (D) < (C)$ 113. $When chlorine is passed through propene at 40 0^{o} C, which of the following is formed?$ (1) $PVC$ (2) $Allyl chloride$ (3) $Propyl chloride$ (4) $1, 2‐Dichloroethane$ 114. $Consider the reaction sequence given below: Which of the following statements is true?$ (1) $Changing the concentration of base will have no effect on reaction (2)$ (2) $Changing the concentration of base will have no effect on reaction (1)$ (3) $Changing the base from OH^{⊖} to OR will have no effect on reaction (2)$ (4) $Doubling the concentration of base will double the rate of both the reactions$ 115. $Alkaline hydrolysis of which among the following compounds leads to the formation of a racemate?$ (1) $1-Bromo-1-phenylethane$ (2) $1-Chloro-3-methylbutane$ (3) $Bromoethane$ (4) $1-Chloropropane$ 116. $Match List-I with List-II. 1 -Bromopropane is reacted with reagents in List-I to give product in List-II List-I Reagent (A) KOH(alc) (B) KCN(alc) (C) A g N O_{2} (D) H_{3} CCOOAg List-II Product (I) Nitrile (II) Ester (III) Alkene (IV) Nitroalkane Choose the correct answer from the options given below$ (1) $A-III, B-I, C-IV, D-II$ (2) $A-I, B-II, C-III, D-IV$ (3) $A-I, B-III, C-IV, D-II$ (4) $A-IV, B-III, C-II, D-I$ 117. $Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is:$ (1) $to remove basic impurities$ (2) $to activate NH_{3} used in the reaction$ (3) $to remove acidic impurities$ (4) $to increase the reactivity of alkyl halide$ 118. $The major product obtained from E_{2} - elimination of 3 -bromo- 2 -fluoropentane is$ (1) $C H_{3} C H_{2} - C H (B r) - C H = C H_{2}$ (2) $C H_{3} - C H = C H - C H (F) - C H_{3}$ (3) $C H_{3} C H_{2} C H = C (C H_{3}) - F$ (4) $C H_{3} - C H_{2} - C (B r) = C H - C H_{3}$ 119. $Which of the following compounds is not chiral$ (1) $C H_{3} C H D C H_{2} C l$ (2) $C H_{3} C H_{2} C H D C l$ (3) $D C H_{2} C H_{2} C H_{2} C l$ (4) $C H_{3} C H C l C H_{2} D$ 120. $2-Methyl propyl bromide reacts with C_{2} H_{5} O^{-} and gives 'A' whereas on reaction with C_{2} H_{5} OH it gives 'B'. The mechanism followed in these reactions and the products 'A' and 'B' respectively are:$ (1) $S_{N} 2, A =iso-butyl ethyl ether; S_{N} 1, B =tert-butyl ethyl ether$ (2) $S_{N} 1, A =tert-butyl ethyl ether; S_{N} 1, B = 2-butyl ethyl ether$ (3) $S_{N} 2, A = 2-butyl ethyl ether; S_{N} 2, B =iso-butyl ethyl ether$ (4) $S_{N} 1, A =tert-butyl ethyl ether; S_{N} 2, B =iso-butyl ethyl ether$