Hydrocarbons PYQs Set 14 (PDF)

Set 14 of 16 · Questions 391-420 of 459

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrocarbons · Set 14 (Q391-420)
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391. $In a set of reactions, ethylbenzene yielded a product D . D would be$ (1) (2) (3) (4) 392. $Two isomers 'A' and ' B^{1} with molecular formula C_{4} H_{8} give different products on oxidation with K M n O_{4} in acidic medium. Isomer 'A' on reaction with K M n O_{4} / H^{+} results in effervescence of a gas and gives ketone. The compound 'A' is$ (1) $But-1 -ene$ (2) $cis-But-2-ene$ (3) $trans-But-2ene$ (4) $2-methyl propene$ 393. $Identify product [A], [B] and [C] in the following reaction sequence. CH_{3} - C \equiv CH \to Pd / C H_{2} [A] \to (i) O_{3} (ii) Zn, H_{2} O [B] + [C]$ (1) $[A] : CH_{2} = CH_{2}, [B] : H_{3} C - C - CH_{3}, [C] : HCHO$ (2) $[A] : CH_{3} - CH = CH_{2}, [B] : CH_{3} CHO, [C] : CH_{3} CH_{2} OH$ (3) $[A] : CH_{3} - CH = CH_{2}, [B] : CH_{3} CHO, [C] : HCHO$ (4) $[A] : CH_{3} CH_{2} CH_{3}, [B] : CH_{3} CHO, [C] : HCHO$ 394. $Propyne was subjected to a reaction with HgSO_{4} / dil. H_{2} SO_{4}, which resulted in a product P . The product P was heated with Ba (OH)_{2} to give the product Q . The molecular formula of the product Q is$ (1) $C_{3} H_{6} O$ (2) $C_{3} H_{8} OH$ (3) $C_{6} H_{12} O_{2}$ (4) $C_{6} H_{10} O$ 395. $When acetylene is passed through dil. H_{2} S O_{4} in the presence of H g S O_{4}, the compound formed is$ (1) $acetic acid$ (2) $ketone$ (3) $ether$ (4) $acetaldehyde$ 396. $The alkane that gives only one monochloro product on chlorination with C l_{2} in precence of diffused sunlight is$ (1) $2,2,-dimethylbutane$ (2) $neopentane$ (3) $n-pentane$ (4) $Isopentane$ 397. $Consider the given chemical reaction: Product " A " is :$ (1) $picric acid$ (2) $acetic acid$ (3) $adipic acid$ (4) $oxalic acid$ 398. $A hydrocarbon 'X' with formula C_{6} H_{8} uses two moles of H_{2} on catalytic hydrogcnation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon 'X' is :$ (1) $hexa-1, 3, 5-triene$ (2) $1-methylcyclopenta-l, 4-diene$ (3) $cyclohexa-l,3-dicne$ (4) $cyclohexa-1, 4-diene$ 399. $The major product 'P' for the following sequence of reactions is:$ (1) (2) (3) (4) 400. $The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are :$ (1) $enantiomers and mesomers$ (2) $identical mesomers$ (3) $enantiomers$ (4) $racemic and enantiomers$ 401. $Benzene on nitration gives nitrobenzene in presence of H N O_{3} and H_{2} S O_{4} mixture, where :$ (1) $both H_{2} S O_{4} and H N O_{3} act as a bases$ (2) $H N O_{3} acts as an acid and H_{2} S O_{4} acts as a base$ (3) $both H_{2} S O_{4} and H N O_{3} act as an acids$ (4) $H N O_{3} acts as a base and H_{2} S O_{4} acts as an acid$ 402. $The product B formed in the following reaction sequence is:$ (1) (2) (3) (4) 403. $Identify major product formed in the following reaction. 3-Bromo-2-methylpentane \to Alc . KOH Δ Major product$ (1) $2-Methylpentan-3-ol$ (2) $2-Methylpent-2-ene$ (3) $4-Methylpent-3-ene$ (4) $4-Methylpentan-3-ol$ 404. $The major product [R] in the following sequence of reactions as:$ (1) $H_{3} C - C (C H (C H_{3})_{2}) = C H - C H_{3}$ (2) $H_{2} C = C (C H (C H_{3})_{2}) - C H_{2} - C H_{3}$ (3) $H_{3} C - C (H_{3} C C H_{2}) = C (C H_{3})_{2}$ (4) $H_{3} C - C H (C H (C H_{3})_{2}) - C H = C H_{2}$ 405. $The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement)$ (1) $l-Bromo-2-methylbutane$ (2) $2-Bromopropane$ (3) $2-Bromopentane$ (4) $2-Bromo- 3_{?} 3-dimethyIpentane$ 406. $The aromatic compound/species with maximum number of π -electrons is$ (1) $Phenanthrene$ (2) $Naphthalene$ (3) $Cyclopentadienyl anion$ (4) $Cycloheptatrienyl cation$ 407. $Identify (B) and (C) and how are (A) and (C) related?$ (1) (2) (3) (4) 408. $The major products of the following reaction are$ (1) $C H_{3} - C (= O) - C H_{3} + C H_{3} C O O H$ (2) $C H_{3} - C (= O) - C H_{3} + C H_{3} C H O$ (3) $(C H_{3})_{2} C H - C O O H + H C O O H$ (4) $(C H_{3})_{2} C H - C H O + H C H O$ 409. $Identify Z in the sequence of reactions : CH_{3} CH_{2} CH = CH_{2} HBr/H_{2} O_{2} Y C_{2} H_{5} ONa Z$ (1) $C H_{3} - (C H_{2})_{3} - O - C H_{2} C H_{3}$ (2) $(C H_{3})_{2} C H - O - C H_{2} C H_{3}$ (3) $C H_{3} (C H_{2})_{4} - O - C H_{3}$ (4) $C H_{3} C H_{2} - C H (C H_{3}) - O - C H_{2} C H_{3}$ 410. $The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is (are)$ (1) (2) (3) (4) 411. $Which of the following is formed when propene is heated with bromine at high temperature?$ (1) $1,2-Dibromopropane$ (2) $1-Bromopropane$ (3) $2-Bromopropane$ (4) $3-Bromopropene$ 412. $What are the suitable reagent for following conversion$ (1) $B r_{2} / F e B r_{3}, K M n O_{4}, H N O_{3} / H_{2} S O_{4}$ (2) $K M n O_{4}, B r_{2} / F e B r_{3}, H N O_{3}$ (3) $H N O_{3}, B r_{2} / F e B r_{3}, K M n O_{4}$ (4) $H N O_{3}, K M n O_{4}, B r_{2} / F e B r_{3}$ 413. $The product (C) in the below mentioned reaction is:$ (1) $Propan-1-ol$ (2) $Propene$ (3) $Propyne$ (4) $Propan-2-ol$ 414. $The major product(s) obtained in the following reaction is/are : (i) KO^{1} Bu (ii) O_{3} / M e_{2} S$ (1) (2) (3) (4) 415. $The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is$ (1) $salicylaldehyde$ (2) $salicylic acid$ (3) $phthalic acid$ (4) $benzoic acid$ 416. $Consider the following reactions, The compound [P] is:$ (1) (2) (3) (4) 417. $The major product of the following reaction is P . Number of oxygen atoms present in product ' P' is_____(nearest integer)$ 418. $3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for ' A' is$ 419. $Total number of isomers (including stereoisomers) obtain on monochlorination of methylcyclohexane is________.$ 420. $Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is$