Haloalkanes & Haloarenes PYQs Set 9 (PDF)

Set 9 of 9 · Questions 241-261 of 261

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Mere Teacher · Previous Year Questions NEET Chemistry · Haloalkanes & Haloarenes · Set 9 (Q241-261)
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241. $p-Hydroxybenzophenone upon reaction with bromine in carbon tetrachloride gives :$ (1) (2) (3) (4) 242. $Identify the correct set of reagents or reaction conditions ' X^{’} and ' Y^{’} in the following set of transformation$ (1) $X= dil.aq. NaOH, 20^{\circ} C, Y = Br_{2} / CHCl_{3}$ (2) $X= conc.alc. NaOH,80\circC, Y = Br_{2} / CHCl_{3}$ (3) $X= dil.aq. NaOH, 20^{\circ} C, Y = HBr /acetic acid$ (4) $X= conc.alc. NaOH, 80^{\circ} C, Y = HBr / acetic acid$ 243. $The dibromo compound [P] (molecular formula: C_{9} H_{10} Br_{2}) when heated with excess sodamide followed by treatment with dilute HCl gives [Q] . On warming [Q] with mercuric sulphate and dilute sulphuric acid yield [R] which gives positive lodoform test but negative Tollen's test. The compound [P] is:$ (1) (2) (3) (4) 244. $How many asymmetric carbons are present in the following molecule? HOH_{2} CCH (Br) CH (Br) CH_{2} OH$ (1) $3$ (2) $1$ (3) $4$ (4) $2$ 245. $C H_{3} - C H C 1 - C H_{2} - C H_{3} has a chiral centre. Which one of the following represents its R‐configuration?$ (1) (2) (3) (4) 246. $' X' is an optically active alkane having lowest molecular mass. Predict the structure of the major product obtained on monochlorination of ' X'.$ (1) $C H_{3} - C H_{2} - C H_{2} - C (C H_{3}) (C l) - C H_{2} - C H_{3}$ (2) $C H_{3} - C H_{2} - C H_{2} - C H (C H_{3}) - C H (C l) - C H_{3}$ (3) $C H_{3} - C H_{2} - C H_{2} - C H (C H_{3}) - C H_{2} - C H_{2} - C l$ (4) $C l - C H_{2} - C H_{2} - C H_{2} - C H (C H_{3}) - C H_{2} - C H_{3}$ 247. $The correct order of melting point of dichlorobenzenes is$ (1) (2) (3) (4) 248. $The stable carbocation formed in the above reaction is :$ (1) $C H_{3} C H_{2} C \oplus H_{2}$ (2) $C H_{3} C \oplus H_{2}$ (3) $C H_{3} - C \oplus H - C H_{3}$ (4) 249. $The structure of product C, formed by the following sequence of reactions is :$ (1) (2) (3) (4) 250. $Decomposition of benzene diazonium chloride by using Cu_{2} Cl_{2} / HCl to form chlorobenzene is$ (1) $Raschig's reaction$ (2) $Sandmeyer's reaction$ (3) $Kolbe's reaction$ (4) $Cannizzaro's reaction.$ 251. $Choose the correct set of reagents for the following conversion$ (1) $Cl_{2} / anhy \cdot AlCl_{3}; Br_{2} / Fe; alc. KOH$ (2) $Cl_{2} / Fe; Br_{2} / anhy. AlCl_{3}; aq. KOH$ (3) $Br_{2} / Fe; Cl_{2}, Δ; alc. KOH$ (4) $Br_{2} / anhy. AlCl_{3}; Cl_{2}, Δ; aq. KOH$ 252. $Phosgene is a common name for$ (1) $phosphoryl chloride$ (2) $thionyl chloride$ (3) $carbon dioxide and phosphine$ (4) $carbonyl chloride.$ 253. $This reaction is known as$ (1) $Wurtz-Fittig reaction$ (2) $Wurtz reaction$ (3) $Fittig reaction$ (4) $Friedel-Crafts reaction$ 254. $Fitting reaction is$ (1) $Reaction between two aryl halides in the presence of Na / dry ether$ (2) $Reaction between two alkyl halides in the presence of Na / dry ether$ (3) $Reaction between aryl halide and alkyl halide in the presence of Na / dry ether$ (4) $Reaction between two aryl halides in the presence of Fe / dry ether$ 255. $The correct IUPAC name of$ (1) $4-ethyl-1-fluoro-2-nitrobenzene$ (2) $1-ethyl-4-fluoro-3-nitrobenzene$ (3) $3-ethyl-6-fluoronitrobenzene$ (4) $5-ethyl-2-fluoronitrobenzene.$ 256. $Acid D formed in above reaction is :$ (1) $Gluconic acid$ (2) $Succinic acid$ (3) $Oxalic acid$ (4) $Malonic acid$ 257. $(intramolecular products) B$ (1) (2) (3) (4) 258. $Chlorocyclohexane is$ (1) $Primary alkyl halide$ (2) $Tertiary alkyl halide$ (3) $Allylic halide$ (4) $Secondary alkyl halide$ 259. $In the given reaction'A' can be$ (1) $benzyl bromide$ (2) $bromobenzene$ (3) $cyclohexyl bromide$ (4) $methyl bromide$ 260. $What is A in the following reaction?$ (1) (2) (3) (4) 261. $The product ' B' is$ (1) (2) (3) (4)