Alcohols, Phenols & Ethers PYQs Set 4 (PDF)

Set 4 of 14 · Questions 91-120 of 396

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Mere Teacher · Previous Year Questions NEET Chemistry · Alcohols, Phenols & Ethers · Set 4 (Q91-120)
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91. $In which of the following compounds deoxygenation is possible when heated with Zn ?$ (1) $A, B and C$ (2) $A, C and D$ (3) $B and D$ (4) $B and C$ 92. $Which amongst the following will be most readily dehydrated under acidic conditions? [NEET 2023]$ (1) (2) (3) (4) 93. $The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :$ (1) $Hyper conjugation in substrate$ (2) $Polarity of solvent$ (3) $Free radical formation$ (4) $Electromeric effect of the substrate$ 94. $What amount of bromine will be required to convert 2 g of phenol into 2,4,6 tribromophenol? (Given molar mass in gmol^{- 1} of C, H, O, Br are 12, 1, 16, 80 respectively )$ (1) $20.44 g$ (2) $4.0 g$ (3) $6.0 g$ (4) $10.22$ 95. $An alkyl chloride 'A' on reaction with magnesium in dry ether followed by treatment with ethanol gave 2-methylbutane. Give the possible strucuture of ‘A’$ (1) $(CH3)2C(Cl)CH2CH3$ (2) $(CH3)2CHCH2CH2Cl$ (3) $CH3CH2CH2CH2CH2X$ (4) $Both (a) and (b)$ 96. $The heating of phenyl methyl ether with Hl produces$ (1) $iodobenzene$ (2) $phenol$ (3) $benzene$ (4) $ethyl chloride$ 97. $Which one of the following compounds will give orange precipitate when treated with 2,4-dinitrophenylhydrazine ?$ (1) (2) (3) (4) 98. $Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?$ (1) $C H_{3} C H (O H) C H_{3}$ (2) $C H_{3} C H_{2} C H (O H) C H_{3}$ (3) $C H_{3} O H$ (4) $C H_{3} C H_{2} O H$ 99. $n‐Propyl alcohol and isopropyl alcohol can be Chemically distinguished by which reagent?$ (1) $P C l_{5}$ (2) $Reduction$ (3) $Oxidation with potassium dichromate$ (4) $Ozonolysis$ 100. $1 - Chloro - 4 - nitrobenzene, 1 - Chloro - 2, 4 - dinitrobenzene and 1 - Chloro - 2, 4, 6 trinitrobenzene are transformed to corresponding phenols with the reagents X, Y, Z respectively. What are X, Y, Z ?$ (1) $X = H_{2} O; Y = NaOH, 365 K; Z = NaOH, 445 K$ (2) $X= (i) NaOH, 443 K, Y = (i) NaOH, 368 K, (ii) H+; (ii) H+; Z = Warm H_{2} O$ (3) $X= (i) NaOH, 625 K, Y = (i) NaOH, 440 K, (ii) H+; (ii) H+; Z = H_{2} O / H^{+}$ (4) $X = NaOH, 625 K; Y = H_{2} O; Z = NaOH, 440 K$ 101. $The reaction can be classified as [ NEET 2016]$ (1) $Alcohol formation reaction$ (2) $Dehydration reaction$ (3) $Williamson alcohol synthesis reaction$ (4) $Williamson ether synthesis reaction$ 102. $A compound 'X' when treated with phthalic anhydride in presence of concentrated H_{2} S O_{4} yields 'Y'. 'Y' is used as an acid/base indicator. 'X' and 'Y' are respectively$ (1) $Anisole, methyl orange$ (2) $Salicylaldehyde, Phenolphthalein$ (3) $Toludine, Phenolphthalein$ (4) $Carbolic acid, Phenolphthalein$ 103. $How many metameric ethers are represented by the molecular formula C_{4} H_{10} O ?$ (1) $4$ (2) $3$ (3) $2$ (4) $5$ 104. $The compound which is not formed during the dry distillation of a mixture of calcium formate and calcium acetate is$ (1) $propanal$ (2) $propanone$ (3) $ethanal$ (4) $methanal.$ 105. $Which ofthe following will not be soluble in sodium hydrogen carbonate?$ (1) $2,4,6‐Trinitrophenol$ (2) $Benzoic acid$ (3) $0 ‐Nitrophenol$ (4) $Benzenesulphonic acid$ 106. $Which of the following alcohols gives white turbidity almost immediately with the Lucas reagent at room temperature? (i) n -butanol (ii) tert-butanol (iii) Benzyl alcohol (iv) Allylic alcohol$ (1) $(i), (ii) and (iii)$ (2) $(i), (iii) and (iv)$ (3) $(ii), (iii) and (iv)$ (4) $(i), (ii) and (iv)$ 107. $When vapours of a secondary alcohol is passed over heated copper at 573 K, the product formed is [NEET 2019]$ (1) $a carboxylic acid$ (2) $an aldehyde$ (3) $a ketone$ (4) $an alkene$ 108. $Find out the major product from the following reaction.$ (1) (2) (3) (4) 109. $Which of the following substituted phenols is the strongest acid? [NEET 2020]$ (1) $4-nitrophenol$ (2) $4-methoxyphenol$ (3) $4-ethylphenol$ (4) $4-methylphenol$ 110. $In the following reaction: A and B The compounds A and B respectively are$ (1) (2) (3) (4) 111. $The compound which forms acetaldehyde when heated with dilute NaOH is$ (1) $1,1,1-trichloroethane$ (2) $1-chloroethane$ (3) $1,2-dichloroethane$ (4) $1,1-dichloroethane.$ 112. $Phenol is heated with C H C l_{3} and aqueous KOH when salicylaldehyde is produced. This reaction is known as$ (1) $Rosenmund’s reaction$ (2) $Reimer‐Tiemann reaction$ (3) $Friedel‐Crafts reaction$ (4) $Sommelet reaction.$ 113. $Number of isomeric alcohols of molecular formula C_{6} H_{14} O which give positive iodoform test is$ (1) $three$ (2) $four$ (3) $five$ (4) $two$ 114. $Arrange the following compounds in the increasing order of their acidic strength : (i) m -Nitrophenol (ii) m -Cresol (iii) Phenol (iv) m -Chlorophenol$ (1) $ii < iv < iii < I$ (2) $ii < iii < i < iv$ (3) $iii < ii < i < iv$ (4) $ii < iii < iv < i$ 115. $In the above reaction, left hand side and right hand side rings are named as 'A' and 'B' respectively. They undergo ring expansion. The correct statement for this process is:$ (1) $Ring expansion can go up to seven membered rings$ (2) $Finally both rings will become six membered each.$ (3) $Finally both rings will become five membered each.$ (4) $Only A will become 6 membered.$ 116. $Propene when treated with cold conc. H_{2} SO_{4} forms a compound which on heating with water gives$ (1) $propan-2-ol$ (2) $butan-1-ol$ (3) $ethanol$ (4) $propan-1-ol.$ 117. $Assertion (A) : pKa of phenol is 4.19 and that of benzoic acid is 10Reason (R) : Phenoxide ion is stabilised by nonequivalent resonance structures whereas benzoate ion by two equivalent resonance structuresThe correct option among the following is$ (1) $A and R are true. R is the correct explanation of A$ (2) $A and R are true, but R is not the correct explanation for A$ (3) $A is true R is false$ (4) $A is false but R is true$ 118. $Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :$ (1) $two ethylenic double bonds$ (2) $a vinyl group$ (3) $an isopropyl group$ (4) $an acetylenic triple bond$ 119. $The correct structure of the product A formed in the reaction: is :$ (1) (2) (3) (4) 120. $Identify simple ether from the following.$ (1) $Methoxymethane$ (2) $Methoxyethane$ (3) $1-propoxybenzene$ (4) $Anisole$