Alcohols, Phenols & Ethers PYQs Set 8 (PDF)

Set 8 of 14 · Questions 211-240 of 406

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Alcohols, Phenols & Ethers · Set 8 (Q211-240)
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211. $The compound on dehydrogenation gives a ketone. The original compound is$ (1) $tertiary alcohol$ (2) $caboxylic acid$ (3) $primary alcohol$ (4) $secondary alcohol.$ 212. $The compound which reacts fastest with Lucas reagent at room temperature is$ (1) $butan‐l‐ol$ (2) $butan‐2‐ol$ (3) $2‐methylpropan‐1‐ol$ (4) $2‐methylpropan‐2‐ol.$ 213. $Identify the product when phenol is heated with zinc dust.$ (1) $Benzoquinone$ (2) $Cyclohexane$ (3) $Benzene$ (4) $Cyclohexanol$ 214. $Which is most viscous?$ (1) $Ethylene glycol$ (2) $Glycerol$ (3) $Methanol$ (4) $Ethanol$ 215. $The intermediate X, in the reaction is$ (1) (2) (3) (4) 216. $The reaction, is called$ (1) $Etard reaction$ (2) $Gattermann‐Koch reaction$ (3) $Williamson synthesis$ (4) $Williamson continuous etherification process.$ 217. $Iodoform reaction is answered by all, except$ (1) $C H_{3} - C H (O H) - C H_{2} - C O O H$ (2) $CH_{3} CHO$ (3) $CH_{3} - CH_{2} - OH$ (4) $CH_{3} - CH_{2} - CH_{2} OH$ 218. $An organic compound X is oxidised by using acidified K_{2} Cr_{2} O_{7} . The product obtained reacts with phenyl hydrazine but does not answer silver mirror test. The possible structure of X is$ (1) $CH_{3} COCH_{3}$ (2) $(CH_{3})_{2} CHOH$ (3) $CH_{3} CHO$ (4) $CH_{3} CH_{2} OH$ 219. $Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions? (R = Alkyl substituent)$ (1) (2) (3) (4) 220. $The general name of the compound formed by the reaction between aldehyde and alcohol is$ (1) $glycol$ (2) $acetate$ (3) $ester$ (4) $acetal.$ 221. $Which of the following is the structure of o -cresol?$ (1) (2) (3) (4) 222. $X \to Ozonolysis (Reductive) Y + Z Y can be obtained by Etard's reaction. Z undergoes disproportionation reaction with concentrated alkali. X could be$ (1) (2) (3) (4) 223. $Which of the following compounds can beused as antifreeze in automobile radiators?$ (1) $Methyl alcohol$ (2) $Glycol$ (3) $Nitrophenol$ (4) $Ethyl alcohol$ 224. $In preparation of sulphuric acid from sulphur dioxide in lead chamber process, what substance is used as a catalyst?$ (1) $Manganese dioxide$ (2) $Vanadium pentoxide$ (3) $Nitric oxide$ (4) $Raney Nickel$ 225. $Ethylene oxide when treated with Grignard reagent yield :$ (1) $Secondary alcohol$ (2) $Tertiary alcohol$ (3) $Cyclopropyl alcohol$ (4) $Primary alcohol$ 226. $What is X in the following reaction? CO + 2 H_{2} \to x CH_{3} OH$ (1) $623 K /300 atm$ (2) $KMnO_{4} / H^{\oplus}$ (3) $Zn /Δ$ (4) $ZnO - Cr_{2} O_{3}, 200 - 300 atm, 573 - 673 K$ 227. $Cannizzaro's reaction is an example of auto oxidation$ (1) $it is a typical reaction of aliphatic aldehyde$ (2) $it is a reaction answered by only aldehydes containing α -hydrogen$ (3) $it is a reaction answered only by aromatic aldehydes$ (4) $Aldehydes, which do not contain an α -hydrogen atom undergoes Cannizzaro reaction.$ 228. $Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether, due to the presence of$ (1) $H ‐bonding in ethanol$ (2) $H ‐bonding in dimethyl ether$ (3) $C H_{3} group in ethanol$ (4) $C H_{3} group in dimethyl ether.$ 229. $Lower members of aliphatic carboxylic acid are soluble in water. This is due to$ (1) $formation of hydrogen bonds with water$ (2) $London forces$ (3) $water is non-electrolyte$ (4) $van der Waals' interaction with water molecules.$ 230. $Name the catalyst used in commercial method of preparation of phenol.$ (1) $Silica$ (2) $Calcium phosphate$ (3) $Anhydrous aluminium chloride$ (4) $none of the above$ 231. $Which of the following compounds undergo haloform reaction?$ (1) $CH_{3} COCH_{3}$ (2) $HCHO$ (3) $CH_{3} CH_{2} Br$ (4) $CH_{3} - O - CH_{3}$ 232. $An organic compound with molecular formula C_{7} H_{8} O dissolves in MaOH and gives a characteristic colour with FeCl_{3} on treatment with bromine, it gives a tribromo derivative C_{7} H_{5} OBr_{3} . The compound is$ (1) $m -cresol$ (2) $p-cresol$ (3) $benzyl alcohol$ (4) $o-cresol.$ 233. $The hydrocarbon which does not decolourise alkaline KMnO4 solution and also does not give any precipitate with ammonical silver nitrate is :$ (1) $benzene$ (2) $acetylene$ (3) $propyne$ (4) $1-butyne$ 234. $Match the reactant in column-I with the reaction in column-II. Column-I (i) Acetic acid (ii) Sodium phenate (iii) Methyl cyanide (iv) Toluene Column-II (A) Stephen’s reaction (B) Friedel-Crafts reaction (C) HVZ reaction (D) Kolbe’s reaction$ (1) $i-C, ii-A, iii-D, iv-B$ (2) $i-D, ii-B, iii-C, iv-A$ (3) $i-B, ii-C, iii-A, iv-D$ (4) $i-C, ii-D, iii-A, iv-B$ 235. $0.44 g of a monohydric alcohol when added to methylmagnesium iodide in ether liberates at S.T.P., 112 cm^{3} of methane. With PCC the same alcohol forms a carbonyl compound that answers silver mirror test. The monohydric alcohol is$ (1) $C H_{3} - C H (O H) - C H_{2} - C H_{3}$ (2) $(CH_{3})_{3} C - CH_{2} OH$ (3) $C H_{3} - C H (O H) - C H_{2} - C H_{2} - C H_{3}$ (4) $(CH_{3})_{2} CH - CH_{2} OH$ 236. $Reaction of Grignard reagent, C_{2} H_{5} MgBr with C_{8} H_{8} O followed hy hydrolysis gives compound " A " whichreacts instantly with Lucas reagent to give compound B, C_{10} H_{13} Cl . The Compound B is:$ (1) (2) (3) (4) 237. $Which of the following gives primary amine on reduction ?$ (1) $CH3CH2NO2$ (2) $CH3CH2-O-N=O$ (3) $C6H5 N = NC6H5$ (4) $CH3CH2 NC$ 238. $The reaction which involves dichlorocarbene as an electrophile is$ (1) $Reimer-Tiemann reaction$ (2) $Kolbe's reaction$ (3) $Friedel-Crafts' acylation$ (4) $Fittig's reaction.$ 239. $Which among the following is not the method of preparation of phenol?$ (1) $Cumenc (ii) dil. HCl, Δ (i) O_{2} / Co naphthenate, 423 K Phenol$ (2) $Chlorobenzene \to (i) NaOH_{3}, 62 K (ii) H_{3} O^{+}, 150 atm Phenol$ (3) $Aniline \to (i) NaNO_{2} + HCl_{2} 273 K (ii) H_{2} O, Δ Phenol$ (4) $Benzene + conc. H_{2} SO_{4} \to Δ Phenol$ 240. $One mole of an organic compound A with the formula C_{3} H_{8} O reacts completely with two moles of HI to form X and Y . When Y is boiled with aqueous alkali it forms Z . Z answers the iodoform test. The compound A is$ (1) $propan-2-ol$ (2) $propan-1-ol$ (3) $ethoxyethane$ (4) $methoxyethane.$