General Organic Chemistry PYQs Set 15 (PDF)

Set 15 of 22 · Questions 421-450 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 15 (Q421-450)
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421. $The increasing order of basicity for the following intermediates is (from weak to strong)$ (1) $(iii) < (iv) < (ii) < (i) < (v)$ (2) $(iii) < (i) < (ii) < (iv) < (v)$ (3) $(v) < (iii) < (ii) < (iv) < (i)$ (4) $(v) < (i) < (iv) < (ii) < (iii)$ 422. $The pair of electron in the given carbanion, CH3C \equiv C^{Θ}, is present in which of the following orbitals?$ (1) $sp$ (2) $2p$ (3) $sp3$ (4) $sp2$ 423. $Which of the following molecules does not show stereoisomerism ?$ (1) $3,4 -Dimethylhex-3-ene$ (2) $3-Methylhex-1-ene$ (3) $3-Ethylhex-3-ene$ (4) $4-Methylhex-1-ene$ 424. $The IUPAC name of the following compound is$ (1) $3-(2-Butyl) Pentane$ (2) $2-(3-Pentyl) butane$ (3) $3-Ethyl-4- methylhexane$ (4) $Methyl-4-ethylhexane$ 425. $The incorrect statement regarding the geometrical isomers of 2-butene is :$ (1) $cis-2-butene and trans-2-butene are not interconvertible at room temperature.$ (2) $cis-2-butene and trans-2-butene are stereoisomers.$ (3) $cis-2-butene has less dipole moment than trans-2-butene.$ (4) $trans-2-butene is more stable than cis-2-butene.$ 426. $Consider the following reaction: C_{2} H_{5} OH + H_{2} S O_{4} \to Product Among the following, which one cannot be formed as a product under any conditions ?$ (1) $Ethylene$ (2) $Acetylene$ (3) $Diethyl ether$ (4) $Ethyl-hydrogen sulphate$ 427. $A s p^{3} hybrid orbital contains$ (1) $1/4 s ‐character$ (2) $1/2 s ‐character$ (3) $1/3 s ‐character$ (4) $2/3 s ‐character.$ 428. $Which of the following is not chiral ?$ (1) $2-Butanol$ (2) $2, 3-Dibromo pentane$ (3) $3-Bromo pentane$ (4) $2-Hydroxy propanoic acid$ 429. $Which of the following statements are correct? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. Aniline can be purified by steam distillation as aniline is miscible in water. C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope. D. An organic compound is pure, if mixed M.P. is remained same. Choose the most appropriate answer from the options given below :$ (1) $A, B, C only$ (2) $A, C, D only$ (3) $A, B, D only$ (4) $B, C, D only$ 430. $SN2 reaction readily occurs in :$ (1) $CH3CH2-O-CH3$ (2) $C H_{3} - C (C H_{3})_{2} - O - C H_{3}$ (3) $CH2=CH-CH2-O-CH3$ (4) $Ph-CH2-O-CH2-CH3$ 431. $Which one of the following can exhibit c i s ‐trans isomerism?$ (1) $C H_{3} - C H C l —COOH$ (2) $H - C \equiv C - C l$ (3) $ClCH = CHCl$ (4) $C l C H_{2} - C H_{2} C l$ 432. $Which nomenclature is not according to IUPAC system ?$ (1) $Br-CH2-CH=CH2 , 1-Bromoprop-2-ene$ (2) $, 4-Bromo, 2, 4-dimethylhexane$ (3) $, 2-Methyl-3-phenylpentane$ (4) $5-oxohexanoic acid `$ 433. $The IUPAC name of the following compound is$ (1) $4-amino-2-formyl-5-hydroxymethylnitrobenzene$ (2) $5-amino-4-hydroxymethyl-2-nitrobenzaldehyde$ (3) $3-amino-4-formyl-5-hydroxymethyl-nitrobenzaldehyde$ (4) $2-nitro-4-hydroxymethyl-5-aminobenzaldehyde$ 434. $Bond line formula of HOCH (CN)_{2} is:$ (1) $H O - C H (C N)_{2}$ (2) $H O - C H (C \equiv N)_{2}$ (3) $H O - C H (C N)_{2}$ (4) 435. $cannot be prepared by :$ (1) $HCHO + PhCH(C H_{3}) C H_{2} Mg$ (2) $P h C O C H_{2} C H_{3} + C H_{3} MgX$ (3) $P h C O C H_{3} + C H_{3} C H_{3} MgX$ (4) $C H_{3} C H_{2} C O C H_{3} + PhMgX$ 436. $The IUPAC name ofis$ (1) $but-3-enoic acid$ (2) $but-1-enoic acid$ (3) $pent-4-enoic acid$ (4) $prop-2-enoic acid.$ 437. $What is the correct IUPAC name of?$ (1) $3-Bromo-2-hydroxy-5-nitrobenzoic acid$ (2) $2-Hydroxy-3-bromo-5-nitrobenzoic acid$ (3) $3-Bromo-4-hydroxy-1-nitrobenzoic acid$ (4) $5-Nitro-3-bromo-2-hydroxybenzoic acid$ 438. $Pricric acid is :$ (1) (2) (3) (4) 439. $The IUPAC name of is$ (1) $1‐chloro‐l‐oxo‐2,3‐dimethylpentane$ (2) $2‐ethyl‐3‐methylbutanoyl chloride$ (3) $2,3‐dimethylpentanoyl chloride$ (4) $3,4‐dimethylpentanoyl chloride.$ 440. $Isoprene (Monomer of natural rubber) is$ (1) $3-Methyl-1,2-butadiene$ (2) $2-Methyl-1,3-butadiene$ (3) $3-Chloro-1,2-butadiene$ (4) $2-Chloro-1,3-butadiene$ 441. $Mesityl oxide is a common name of :$ (1) $2, 4 - Dimethyl pentan- 3 -one$ (2) $3 - Methyl cyclohexane carbaldehyde$ (3) $2 - Methyl cyclohexanone$ (4) $4-Methyl pent - 3 - en - 2 - one$ 442. $For geometric isomers of 3-hexene :$ (1) $M.P. is high and dipole moment high for trans$ (2) $M.P. is low and dipole moment low for trans$ (3) $M.P. is high and dipole moment low for trans$ (4) $M.P. is low and dipole moment high for trans$ 443. $The IUPAC name of C_{6} H_{5} COCI is :$ (1) $Benzoyl chloride$ (2) $Benzene chloro ketone$ (3) $Benzene carbonyl chloride$ (4) $Chloro phenyl ketone$ 444. $The reaction of propene with HOCl (C l_{2} + H_{2} O) proceeds through the intermediate$ (1) $C H_{3} - C H^{+} - C H_{2} -Cl$ (2) $C H_{3} -CH(OH)-CH_{2}^{+}$ (3) $C H_{3} -CHCl-CH_{2}^{+}$ (4) $C H_{3} - C H^{+} - C H_{2} -OH$ 445. $The order of reactivity of halides towards SN1 mechanism is :$ (1) $benzyl > allyl > 1° > 2° > 3° > Me$ (2) $Me > 1° > 2° > 3° > allyl > benzyl$ (3) $3° > 2° > 1° > Me > allyl > benzyl$ (4) $benzyl > allyl > 3° > 2° > 1° > Me$ 446. $Allyl phenyl ether can be prepared by heating :$ (1) $C_{6} H_{5} Br + C H_{2} =CH- C H_{2} -ONa$ (2) $C H_{2} =CH- C H_{2} -Br + C_{6} H_{5} ONa$ (3) $C_{6} H_{5} -CH=CH-Br + C H_{3} -ONa$ (4) $C H_{2} =CH-Br + C_{6} H_{5} - C H_{2} -ONa$ 447. $The alkene that exhibits geometrical isomerism is :$ (1) $2-methyl propene$ (2) $2-butene$ (3) $2-methyl-2-butene$ (4) $propene$ 448. $The molecule having largest dipole moment among the following is:$ (1) $CHI3$ (2) $CH4$ (3) $CHCI3$ (4) $CCI4$ 449. $Which one of the following will show geometrical isomerism?$ (1) (2) (3) (4) 450. $Which one of the following statements is not correct ?$ (1) $Alcohols are weaker acids than water.$ (2) $Acid strength of alcohols decreases in the following order R C H_{2} OH > R_{2} CHOH > R_{3} COH.$ (3) $Carbon-oxygen bond length in methanol, C H_{3} OH is shorter than that of C-O bond length in phenol.$ (4) $The bond angle in methanol is 108.9º.$