General Organic Chemistry PYQs Set 18 (PDF)

Set 18 of 22 · Questions 511-540 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 18 (Q511-540)
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511. $Which of the following molecules represents the order of hybridization s p^{2}, s p^{2}, sp, sp from left to right atoms?$ (1) $HC \equiv C - C \equiv CH$ (2) $C H_{3} -CH = CH - C H_{3}$ (3) $C H_{2} = CH - CH = C H_{2}$ (4) $C H_{2} = CH - C \equiv CH$ 512. $A straight chain hydrocarbon has the molecular formula C_{8} H_{10} . The hybridization of the carbon atoms from one end ofthe chain to the other are respectively s p^{3}, s p^{2}, s p^{2}, s p^{3}, s p^{2}, s p^{2}, s p and s p . The structural formula of the hydrocarbon would be$ (1) $C H_{3} C \equiv C C H_{2} - C H = CHCH = C H_{2}$ (2) $C H_{3} C H_{2} - C H = CHCH = C H C \equiv C H$ (3) $CHCH = C H C H_{2} - C \equiv C C H = C H_{2}$ (4) $CHCH = C H C H_{2} - C H = C H C \equiv C H$ 513. $The increasing order of reactivity of the following compound towards reaction with alkyl halides directly is:$ (1) $(B) < (A) < (C) < (D)$ (2) $(A) < (B) < (C) < (D)$ (3) $(B) < (A) < (D) < (C)$ (4) $(A) < (C) < (D) < (B)$ 514. $Which of the following reactions will yield 2,2-dibromopropane ?$ (1) $CH3-C \equiv CH + 2HBr \to$ (2) $CH3CH=CHBr + HBr \to$ (3) $CH \equiv CH + 2HBr \to$ (4) $CH3-CH=CH2 + HBr \to$ 515. $The organic compound 5-allylcyclohex-3-ene-1-ol is reacted with cold, dilute, aqueous solution of KMnO_{4} . The total number of hydroxyl group(s) (- OH) present in the product is$ (1) $1$ (2) $2$ (3) $3$ (4) $5$ 516. $Which of the following is an aromatic compound?$ (1) (2) (3) (4) 517. $Propane molecule on chlorination under photochemical condition gives two di-chloro products, " x " and " y ". Amongst " x " and " y ", " x " is an optically active molecule. How many tri-chloro products (consider only structural isomers) will be obtained from " x " when it is further treated with chlorine under the photochemical condition?$ (1) $2$ (2) $5$ (3) $4$ (4) $3$ 518. $The number of chiral compounds produced upon monochlorination of 2-methylbutane is :$ (1) $2$ (2) $4$ (3) $6$ (4) $8$ 519. $Which of the following carbocations is most stable$ (1) (2) (3) (4) 520. $In the presence of light perchlorodiethyl ether is obtained from diethyl ether. (C_{2} H_{5})_{2} O Cl_{2} (C_{2} C l_{5})_{2} O The mechanism through which this reaction proceed.$ (1) $Addition mechanism$ (2) $Substitution mechanism$ (3) $Free radical mechanism$ (4) $Elimination mechanism$ 521. $The optically inactive compound from the following is :$ (1) $2-chloropentane$ (2) $2-chloropropanal$ (3) $2-chloro-2-methylbutane$ (4) $2-chlorobutane$ 522. $Among the following which one can have a meso form ?$ (1) $CH3CH(OH)CH(CI)C2H5$ (2) $CH3CH(OH)CH(OH)CH3$ (3) $C2H5CH(OH)CH(OH)CH3$ (4) $HOCH2CH(CI)CH3$ 523. $Which nomenclature is not according to IUPAC system?$ (1) (2) (3) (4) 524. $The number of stereoisomers obtained by bromination of trans-2-butene is :$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 525. $on mercuration-demercuration produces the major product.$ (1) (2) (3) (4) 526. $In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :$ (1) $Na_{3} PO_{4} \cdot 12 MoO_{3}$ (2) $(NH_{4})_{3} PO_{4} \cdot 12 MoO_{3}$ (3) $MoPO_{4} \cdot 21 NH_{4} NO_{3}$ (4) $(NH_{4})_{3} PO_{4} \cdot 12 (NH_{4})_{2} MoO_{4}$ 527. $When the hybridization state of carbon atom changes from s p^{3} to s p^{2} and finally to s p, the angle between the hybridized orbitals$ (1) $decreases gradually$ (2) $decreases considerably$ (3) $is not affected$ (4) $increases progressively.$ 528. $The product of the reaction give below is : X$ (1) (2) (3) (4) 529. $The IUPAC name of the following compound is :$ (1) $3-ethyl-4-methylhex-4-ene$ (2) $4,4-diethyl-3-methylbut-2-ene$ (3) $4-methyl-3-ethylhex-4-ene$ (4) $4-ethyl-3-methylhex-2-ene$ 530. $Which of the following compounds has wrong IUPAC name:$ (1) $CH3-CH2-CH2-COO-CH2CH3 \to Ethyl butanoate$ (2) $\to 3-Methylbutanal$ (3) $\to 2-Methyl-3-butanol$ (4) $\to 2-Methyl-3-pentanone$ 531. $The number of possible aromatic benzenoid isomers for C_{6} H_{4} Cl_{2} are$ (1) $2$ (2) $3$ (3) $4$ (4) $5$ 532. $The most stable carbocation among the following is$ (1) $(C H_{3})_{3} C- C H^{+} - C H_{3}$ (2) $C H_{3} - C H_{2} - C H^{+} - C H_{2} - C H_{3}$ (3) $C H_{3} - C H^{+} - C H_{2} - C H_{2} - C H_{3}$ (4) $C H_{3} - C H_{2} - C H^{+}$ 533. $HBr reacts with C H_{2} =CH- O C H_{3} under anhydrous conditions at room temperature to give$ (1) $C H_{3} CHO and C H_{3} Br$ (2) $B r C H_{2} CHO and C H_{3} Br$ (3) $B r C H_{2} - C H_{2} - O C H_{3}$ (4) $H_{3} C-CHBr- O C H_{3}$ 534. $The IUPAC name of the following compound is$ (1) $5-cyanopentan-2-onc$ (2) $5-oxohexanenitrile$ (3) $4-oxopentanenitrile$ (4) $2-oxopentanenitrile$ 535. $What is the hybridisation state of benzylcarbonium ion$ (1) $s p^{2}$ (2) $s p d^{2}$ (3) $s p^{2} d$ (4) $s p^{3}$ 536. $The major product C and D formed in the following reaction respectively are : ` H_{3} C- C H_{2} - C H_{2} -OC (C H_{3})_{2} excess HI Δ C + D$ (1) $H_{3} C- C H_{2} - C H_{2} -I and I-C (C H_{3})_{3}$ (2) $H_{3} C- C H_{2} - C H_{2} -OH and I-C (C H_{3})_{3}$ (3) $H_{3} C- C H_{2} - C H_{2} -I and HO-C (C H_{3})_{3}$ (4) $H_{3} C- C H_{2} - C H_{2} -OH and HO-C (C H_{3})_{3}$ 537. $Chlorobenzene reacts with trichloroacetaldehyde in the presence of H_{2} S O_{4} The major product formed is :$ (1) (2) (3) (4) 538. $Which of the products indicates the presence of sulphur atom in an organic compound, in qualitative elemental analysis?$ (1) $Fe_{2} SO_{4}$ (2) $ZnS$ (3) $MgS$ (4) $PbS$ 539. $A species having carbon with sextet of electrons and can act as electrophile is called$ (1) $carbon free radical$ (2) $carbanion$ (3) $carbocation$ (4) $pentavalent carbon$ 540. $Given Which of the given compounds can exhibit tautomerism ?$ (1) $I and II$ (2) $II and III$ (3) $I, II and III$ (4) $I and III$