Hydrocarbons PYQs Set 4 (PDF)

Set 4 of 15 · Questions 91-120 of 435

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrocarbons · Set 4 (Q91-120)
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91. $The major products A and B in the following reactions are$ (1) (2) (3) (4) 92. $In the conversion of A to B, the electrophile involved is$ (1) $^{\oplus} CH_{3}$ (2) $C l - C \oplus = O$ (3) $Cl^{\oplus}$ (4) $H_{3} C - C \oplus = O$ 93. $One of the following which does not observe the anti‐Markownikoffs addition of HBr, is$ (1) $pent‐2‐ene$ (2) $propene$ (3) $but‐2‐ene$ (4) $but‐l‐ene.$ 94. $The major product 'P' formed in the given reaction is$ (1) (2) (3) (4) 95. $Which of the following chemical system is non aromatic?$ (1) (2) (3) (4) 96. $Geometrical isomerism can be found in which of the following?$ (1) $Butyric acid$ (2) $Aspartic acid$ (3) $Palmitic acid$ (4) $Cinnamic acid$ 97. $The most stable conformation of n ‐butane is$ (1) $gauche$ (2) $staggered$ (3) $skew boat$ (4) $eclipsed.$ 98. $Which compound amongst the following is not an aromatic compound?$ (1) $1,3,5-cycloheptatriene$ (2) $cyclopentadienyl anion$ (3) $cycloheptatrienyl cation (tropylium)$ (4) $cyclopropenyl cation$ 99. $But 2-ene on reaction with alkaline KMn O_{4} at elevated temperature followed by acidification will give:$ (1) $C H_{3} - C H (O H) - C H (O H) - C H_{3}$ (2) $one molecule of C H_{3} CHO and one molecule C H_{3} COOH$ (3) $2 molecules of C H_{3} COOH$ (4) $2 molecules of C H_{3} CHO$ 100. $Given below are two statements: Statement I : Nitration of benzene involves the following step - Statement II : Use of Lewis base promotes the electrophilic substitution of benzene. In the light of the above statements, choose the most appropriate answer from the options given below :$ (1) $Statement I is correct but Statement II is incorrect$ (2) $Statement I is incorrect but Statement II is correct$ (3) $Both Statement I and Statement II are correct$ (4) $Both Statement I and Statement II are incorrect$ 101. $The major product of the following reaction is:$ (1) (2) (3) (4) 102. $The product formed in the following multistep reaction is:$ (1) $C H_{3} - C H_{2} - C (= O) - O C H_{3}$ (2) $C H_{3} - C (O H) (C H_{3}) - C H_{3}$ (3) $C H_{3} - C H_{2} - C H (O H) - C H_{3}$ (4) $C H_{3} - C H_{2} - C H_{2} - C H_{2} - O H$ 103. $What are Y and Z in the following reaction sequence? Y B Z$ (1) $NaOH/CaO CH_{3} (CH_{2})_{2} CH_{3}$ (2) $NaOH/ electrolysis H_{3} C - CH_{3}$ (3) $NaOH/CaO H_{3} C - CH_{3}$ (4) $NaOH /electrolysis CH_{3} (CH_{2})_{2} CH_{3}$ 104. $The major product in the following reaction$ (1) (2) (3) (4) 105. $Which of the following reactions is used to prepare toluene from bromobenzene?$ (1) $Wurtz reaction$ (2) $Fitting reaction$ (3) $Wurtz-Fitting reaction$ (4) $Swartz reaction$ 106. $Propan -1-ol can be prepared from propene by :$ (1) $H2O / H2SO4$ (2) $Hg (OAc)2 / H2O followed by NaBH4$ (3) $B2H6 followed by H2O2$ (4) $CH3CO2H / H2SO4$ 107. $Identify the product A and product B in the following set of reactions.$ (1) $A - C H_{3} C H_{2} C H_{2} - O H B - C H_{3} C H (O H) - C H_{3}$ (2) $A - C H_{3} C H_{2} C H_{3} B - C H_{3} C H_{2} C H_{3}$ (3) $A - C H_{3} C H_{2} C H_{2} - O H B - C H_{3} C H_{2} C H_{2} - O H$ (4) $A - C H_{3} - C H (O H) - C H_{3}, B - C H_{3} C H_{2} C H_{2} - O H$ 108. $An organic compound of molecular formula C_{6} H_{6} Br_{2} has six carbon atoms in a ring system, two non-conjugate double bonds and two bromo groups at 1, 4-positions. Then the compound is$ (1) $aromatic but non-homo-cyclic$ (2) $aromatic and hetero-cyclic$ (3) $homo-cyclic but not aromatic$ (4) $neither homo-cyclic nor hetero-cyclic$ 109. $I. (CH_{3})_{2} C = CH_{2} \to KMnO 4/ H + X + CO_{2} + H_{2} O II. CH_{3} - CH = CH - CH_{3} \to KMnO 4/ H + Y The functional groups in X and Y are respectively$ (1) (2) (3) (4) 110. $Which compound among the following is most reactive towards electrophilic reagents?$ (1) (2) (3) (4) 111. $How many isomers are possible for an alkane having molecular formula C_{5} H_{12} ?$ (1) $5$ (2) $3$ (3) $4$ (4) $2$ 112. $Which of the following reaction is expected to readily give a hydrocarbon product in good yields?$ (1) $C H C H C l_{2} h ν$ (2) $(C H_{3})_{2} C H C l C_{2} H_{5} O H$ (3) $R C O O K Electrolysis Oxidation$ (4) $R C O O A g I_{2}$ 113. $Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction :$ (1) $HOCl$ (2) $dilute H N O_{2}$ (3) $Liquid N H_{3}$ (4) $Concentrated H I O_{3}$ 114. $What will be the product A in the reaction given below?$ (1) (2) (3) (4) 115. $The total number of overlapping p -orbitals present in cycloheptatrienyl cation is$ (1) $4$ (2) $5$ (3) $6`$ (4) $7$ 116. $For the given reaction: 1. NaNH_{2} 2. Red hot iron tube, 873 K ‘A’ (major product) What is ‘A’$ (1) $C H (C H_{3}) = C H - N H_{2}$ (2) (3) (4) $C H_{3} C H_{2} C H_{2} N H_{2}$ 117. $Given below are two statements: Statement I: Benzene is nitrated to give nitrobenzene, which on further treatment with CH_{3} COCl / AlCl_{3} will give 3-nitroacetophenone Statement II: - NO_{2} group is a m -directing, and deactivating group. In the light of the above statements, choose the most appropriate answer from the options given below$ (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) $Statement I is correct but Statement II is incorrect$ 118. $Identify the reagent(s) ’ A ’ and condition(s) for the reaction:$ (1) $A = HCl; AnhydrousAlCl3$ (2) $A = HCl, Zn Cl_{2}$ (3) $A = Cl_{2}; UV light$ (4) $A = Cl_{2}; dark, AnhydrousAlCl3$ 119. $Which of the following statements are correct? I. In nitrating mixture nitric acid participates as an acid. II. σ complex is the intermediate substance in electrophilic substitution of benzene. III. Benzene on Friedel-Crafts alkylation with n -propyl chloride gives isopropyl benzene.$ (1) $II, III only$ (2) $I, II only$ (3) $I, III only$ (4) $I, II, III$ 120. $Reaction of HBr with propene in the presence of peroxide gives$ (1) $isopropyl bromide$ (2) $3‐bromopropane$ (3) $allyl bromide$ (4) $n ‐propyl bromide$