Hydrocarbons PYQs Set 5 (PDF)

Set 5 of 16 · Questions 121-150 of 459

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrocarbons · Set 5 (Q121-150)
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121. $What will be the product A in the reaction given below?$ (1) (2) (3) (4) 122. $The total number of overlapping p -orbitals present in cycloheptatrienyl cation is$ (1) $4$ (2) $5$ (3) $6`$ (4) $7$ 123. $For the given reaction: 1. NaNH_{2} 2. Red hot iron tube, 873 K ‘A’ (major product) What is ‘A’$ (1) $C H (C H_{3}) = C H - N H_{2}$ (2) (3) (4) $C H_{3} C H_{2} C H_{2} N H_{2}$ 124. $Given below are two statements: Statement I: Benzene is nitrated to give nitrobenzene, which on further treatment with CH_{3} COCl / AlCl_{3} will give 3-nitroacetophenone Statement II: - NO_{2} group is a m -directing, and deactivating group. In the light of the above statements, choose the most appropriate answer from the options given below$ (1) $Statement I is incorrect but Statement II is correct$ (2) $Both Statement I and Statement II are incorrect$ (3) $Both Statement I and Statement II are correct$ (4) $Statement I is correct but Statement II is incorrect$ 125. $Identify the reagent(s) ’ A ’ and condition(s) for the reaction:$ (1) $A = HCl; AnhydrousAlCl3$ (2) $A = HCl, Zn Cl_{2}$ (3) $A = Cl_{2}; UV light$ (4) $A = Cl_{2}; dark, AnhydrousAlCl3$ 126. $Which of the following statements are correct? I. In nitrating mixture nitric acid participates as an acid. II. σ complex is the intermediate substance in electrophilic substitution of benzene. III. Benzene on Friedel-Crafts alkylation with n -propyl chloride gives isopropyl benzene.$ (1) $II, III only$ (2) $I, II only$ (3) $I, III only$ (4) $I, II, III$ 127. $Reaction of HBr with propene in the presence of peroxide gives$ (1) $isopropyl bromide$ (2) $3‐bromopropane$ (3) $allyl bromide$ (4) $n ‐propyl bromide$ 128. $When propyne is passed through a red hot iron tube at 873 K, the reaction gives product having molecular formula of$ (1) $C_{7} H_{8}$ (2) $C_{9} H_{12}$ (3) $C_{8} H_{10}$ (4) $C_{6} H_{6}$ 129. $The reaction of toluene with C 1_{2} in presence of F e C 1_{3} gives X and reaction in presence of light gives Y . Thus, X and Y are$ (1) $X = Benzal chloride, Y = 0 ‐chlorotoluene$ (2) $X = m ‐chlorotoluene, Y = p ‐chlorotoluene$ (3) $X = o - and p -chlorotoluene, Y = Trichloromethyl benzene$ (4) $X = Benzyl chloride, Y = m ‐chlorotoluene$ 130. $Identify the correct catalyst and reaction conditions for the controlled oxidation of methane to (i) methanol (X), (ii) methanal (Y) and ethane to (iii) ethanoic acid (Z) (X) (Y) (Z)$ (1) $Mo_{2} O_{3} /Δ (CH_{3} COO)_{2} Cu /523 K /100 atm Cu /523 K /100 atm Mn /Δ$ (2) $Cu /523 K /100 atm Mo_{2} O_{3} /Δ; (CH_{3} COO)_{2}; Mn /Δ$ (3) $(CH_{3} COO)_{2} Mn /Δ Mo_{2} O_{3} /Δ$ (4) $Mo_{2} O_{3} /Δ Cu /523 K /100 atm (CH_{3} COO)_{2} Mn /Δ$ 131. $What is the number of moles of tertiary carbon atoms in a molecule of isobutane?$ (1) $One$ (2) $Two$ (3) $Three$ (4) $Four$ 132. $Ethyl phenyl acetylene (1-phenyl-1-butyne) on reduction with partially deactiveated palladised charcoal (Lindlar's catalyst) gives$ (1) (2) (3) (4) 133. $Increasing order of electrophilic substitution for following compounds$ (1) $I V < I < I I < I I I$ (2) $I I I < I I < I < I V$ (3) $I < I V < I I I < I I$ (4) $I I < I I I < I < I V$ 134. $The number of π -bonds and lone pair(s) present in the major benzenoid product, which formed when benzene is reacted with acetyl chloride in the presence of anhydrous aluminium chloride, respectively are$ (1) $5 : 2$ (2) $4 : 2$ (3) $5 : 4$ (4) $6 : 4$ 135. $Assertion (A): Reaction of 1-butene with HBr gives 1 -bromobutane as major product. Reason (R): Addition of hydrogen halides to alkenes proceeds according to Markownikoff's rule. The correct answer is$ (1) $A and R are correct and R is the correct explanation of A$ (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) $A is not correct but R is correct$ 136. $Which one of the following nitro-compounds does not react with nitrous acid$ (1) $H_{3} C - C (= O) - C H (C H_{3}) - N O_{2}$ (2) $H_{3} C - C H_{2} - C H_{2} - N O_{2}$ (3) $H_{3} C - C H (H_{3} C) - C H_{2} - N O_{2}$ (4) $H_{3} C - C (C H_{3}) (C H_{3}) - N O_{2}$ 137. $The correct order of boiling points of following molecules is (i) n -Hexane (ii) 2-methylpentane (iii) 2,3-dimethylbutane$ (1) $i > ii > iii$ (2) $iii > ii > i$ (3) $iii > i > ii$ (4) $i > iii > ii$ 138. $The alkane that gives only one monochloro product on chlorination with C l_{2} in presence of diffused sunlight is$ (1) $2,2‐dimethylbutane$ (2) $neopentane$ (3) $n ‐pentane$ (4) $isopentane$ 139. $Identify the ortho and para directing groups towards aromatic electrophilic substitution reactions from the following list - OH - CN - CO_{2} H - OCH_{3} - NHCOCH_{3} - CHO I II III IV V VI$ (1) $I, IV, V$ (2) $II, III, VI$ (3) $I, II, IV$ (4) $IV, V, VI$ 140. $2 -hexene (i) O_{3} (ii) H_{2} O Products The two products formed in above reaction are$ (1) $Butanal and acetaldehyde$ (2) $Butanoic acid and acetaldehyde$ (3) $Butanal and acetic acid$ (4) $Butanoic acid and acetic acid$ 141. $In the following substitution reaction: product^{’} P^{’} formed is:$ (1) (2) (3) (4) 142. $3-phenylpropene on reaction with HBr gives (as a major product) :$ (1) $C6H5CH(Br)CH2 CH3$ (2) $C6H5CH2CH (Br) CH3$ (3) $C6H5CH2CH2CH2 Br$ (4) $C6H5CH(Br) CH = CH2$ 143. $Identify A in the given chemical reaction. Mo_{2} O_{3} 773 K, 10 - 20 atm A (major product)$ (1) (2) (3) (4) 144. $The major product of the following chemical reaction is + HBr (C_{6} H_{5} CO)_{2} O_{2} ?$ (1) $(H_{3} C)_{2} C H - C H_{2} - C H_{2} - B r$ (2) $(H_{3} C)_{2} C H - C H_{2} - C H_{2} - O - C O C_{6} H_{5}$ (3) (4) $(C H_{3})_{2} C H - C H (B r) - C H_{3}$ 145. $For the preparation of alkanes, aqueous solution of sodium or potassium salt of carboxylic acid is subjected to$ (1) $hydrogenation$ (2) $oxidation$ (3) $electrolysis$ (4) $hydrolysis.$ 146. $Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product?$ (1) (2) (3) (4) 147. $In Friedel‐Crafts reaction, toluene can be prepared by$ (1) $C_{6} H_{6} + C H_{3} C 1$ (2) $C_{6} H_{5} C 1 + C H_{4}$ (3) $C_{6} H_{6} + C H_{2} C 1_{2}$ (4) $C_{6} H_{6} + C H_{3} C O C 1$ 148. $Given below are two statements: Statement (I): On nitration of m-xylene with HNO_{3}, H_{2} SO_{4} followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product. Statement (II): - CH_{3} group is o/p-directing while - NO_{2} group is m-directing group. choose the correct answer from the options given below:$ (1) $Both Statement I and Statement II are false$ (2) $Statement I is false but Statement II is true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are true$ 149. $In the following reaction sequence, the amount of D (in g) formed from 10 moles of acetophenone is\dots.... (Atomic weights in g m o l^{-1} : H = 1, C = 12, N = 14, O = 16, Br = 80. The yield (%) corresponding to the product in each step is given in the parenthesis)$ 150. $In bromination of Propyne, with Bromine 1,1,2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2 tetrabromopropane obtained from 1 g of Bromine in this reaction is ______x 1 0^{- 1} g. (Nearest integer) (Molar Mass : Bromine = 80 g/mol)$