General Organic Chemistry PYQs Set 4 (PDF)

Set 4 of 22 · Questions 91-120 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 4 (Q91-120)
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91. $Which of the following is NOT a pair of functional isomers?$ (1) $CH_{3} CH_{2} OH and CH_{3} OCH_{3}$ (2) $CH_{3} CH_{2} NO_{2} and H_{2} NCH_{2} COOH$ (3) $CH_{3} COOH and HCOOCH_{3}$ (4) $C_{2} H_{5} OC_{2} H_{5} and C_{3} H_{7} OCH_{3}$ 92. $Which of the following is an example of SN2 reaction ?$ (1) $C H_{3} B r + O H^{-} \to C H_{3} O H + B r^{-}$ (2) $C H_{3} - B r C H - C H_{3} + O H^{-} ⟶ C H_{3} - O H C H - C H_{3}$ (3) $CH3CH2OHCH2 = CH2$ (4) $(CH3)3C - Br+OH- (CH3)3COH+ Br -$ 93. $Which of the following compounds is not aromatic?$ (1) (2) (3) (4) 94. $Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine. Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method. In the light of the above statements, choose the correct answer from the options given below$ (1) $Both Statement I and Statement II are true$ (2) $Both Statement I and Statement II are false$ (3) $Statement I is false but Statement II is true$ (4) $Statement I is true but Statement II is false$ 95. $An unknown alochol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :$ (1) $secondary alcohol by S_{N} 1$ (2) $tertiary alcohol by S_{N} 1$ (3) $secondary alcohol by S_{N} 2$ (4) $tertiary alcohol by S_{N} 2$ 96. $In Carius tube, an organic compound 'X' is treated with sodium peroxide to form a mineral acid 'Y'. The solution of B a C l_{2} is added to 'Y' to form a precipitate 'Z'.'Z' is used for the quantitative estimation of an extra element.' X ' could be$ (1) $Cytosine$ (2) $A nucleotide$ (3) $Methionine$ (4) $Chloroxylenol$ 97. $The Lassaigne’s extract is boiled with conc. H N O_{3} while testing for halogens. By doing so it$ (1) $decomposes N a S and NaCN, formed$ (2) $helps in the precipitation of A g C 1$ (3) $increases the solubility product of A g C 1$ (4) $increases the concentration of N O_{3}^{-} ions$ 98. $Which among the following is a set of nucleophiles?$ (1) $H^{+}, NH_{3}, Cl^{-}$ (2) $BF_{3}, H_{2} O, NH_{3}$ (3) $AlCl_{3}, BF_{3}, NH_{3}$ (4) $CN^{-}, H_{2} O, R - OH$ 99. $Which one of the following is the strongest base in aqueous solution?$ (1) $Dimethylamine$ (2) $Methylamine$ (3) $Trimethylamine$ (4) $Aniline$ 100. $Which one of the following is not true regarding electromeric effect?$ (1) $It results in the appearance of partial charges on the carbon atoms.$ (2) $It is a temporary effect.$ (3) $It operates on multiple bonds.$ (4) $It requires an attacking reagent.$ 101. $C H_{3} Br + N u^{-} \to C H_{3} - Nu + B r^{-} The decreasing order of the rate of the above reaction with nucleophiles (N u^{-}) A to D is : [N u^{-} = (a) P h O^{-}, (b) A c O^{-}, (c) H O^{-}, (d) C H_{3} O^{-}]$ (1) $D > C > A > B$ (2) $D > C > B > A$ (3) $A > B > C > D$ (4) $B > D > C > A$ 102. $Which one of the following orders of acid strength is correct?$ (1) $RCOOH > R O H > H O H > H C \equiv C H$ (2) $RCOOH > H O H > R O H > H C \equiv C H$ (3) $RCOOH > H O H > H C \equiv C H > R O H$ (4) $RCOOH > H C \equiv C H > H O H > R O H$ 103. $Which of the following method is adopted to obtain gasoline from crude oil?$ (1) $Vacuum distillation$ (2) $Steam distillation$ (3) $Adsorption on animal charcoal$ (4) $Fractional distillation$ 104. $Match List-I with List -II: List-I (Metal Ion) (A) Mn^{2 +} (B) As^{3 +} (c) Cu^{2 +} (d) Al^{3 +} List-II (Group in Qualitative analysis) (i) Group - III (ii) Group - IIA (iii) Group - IV (iv) Group - IIB Choose the most appropriate answer from the options given below :$ (1) $(A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)$ (2) $(A)-(iii), (B)-(iv), (C)-(ii), (D)-(i)$ (3) $(A)-(i), (B)-(iv), (C)-(ii), (D)-(iii)$ (4) $(A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)$ 105. $In an SN1 reaction on chiral centres there is :$ (1) $100 % racemization$ (2) $inversion more than retention leading to partial racemization$ (3) $100 % retention$ (4) $100 % inversion$ 106. $Lassaigne's test is used for detection of :$ (1) $Nitrogen and Sulphur only$ (2) $Nitrogen, Sulphur and Phosphorous Only$ (3) $Phosphorous and halogens only$ (4) $Nitrogen, Sulphur, phosphorous and halogens$ 107. $An organic compound [A](C_{4} H_{11} N), shows optical activity and gives N_{2} gas on treatment with H N O_{2} . The compound [A] reacts with P h S O_{2} Cl producing a compound which is soluble in KOH, The structure of A is:$ (1) (2) (3) (4) 108. $Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Benzene is more stable than hypothetical cyclohcxatriene. Reason R : The delocalized π electron cloud is attracted more strongly by nuclei of carbon atoms. choose the correct answer from the options given below:$ (1) $A is true but R is false.$ (2) $A is false but R is true.$ (3) $Both A and R are correct and R is the correct explanation of A.$ (4) $Both A and R are correct but R is NOT the correct explanation of A.$ 109. $The increasing order of nucleophilicity of the following nucleophiles is : (A) CH_{2} CO_{2}^{-} (B) H_{2} O (C) CH_{3} SO_{3}^{-} (D) O H$ (1) $(A) < (D) < (C) < (B)$ (2) $(B) < (C) < (D) < (A)$ (3) $(D) < (A) < (C) < (B)$ (4) $(B) < (C) < (A) < (D)$ 110. $Given below are two statement : Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding Statement II : 0-Nitrophenol has high melting point due to hydrogen bonding. choose the most appropriate answer from the options given below :$ (1) $Both Statement I and Statement II are false$ (2) $Statement I is false but Statement II is true$ (3) $Both Statement I and Statement II are true$ (4) $Statement I is true but Statement II is false$ 111. $An S_{N} 2 reaction at an asymmetric carbon of a compound always gives :$ (1) $an enantiomer of the substrate$ (2) $a product with opposite optical rotation$ (3) $a mixture of diastereomers$ (4) $a single stereoisomer$ 112. $Which of the following will most readily give the dehydrohalogenation product ?$ (1) (2) (3) (4) 113. $Identify the correct statements from the following (i) Electromeric effect is a permanent effect. (ii) Hyper conjugation is a temporary effect. (iii) Fractional distillation is used to separate two liquids from a mixture if the difference in their boiling points is less. (iv) Different compounds are adsorbed on an adsorbent different extents.$ (1) $ii, iii, iv$ (2) $i, ii, iii$ (3) $ii, iv$ (4) $iii, iv$ 114. $The correct increasing order of the reactivity of halides for SN1 reaction is :$ (1) $CH3 - CH2 - X < (CH3)2CH - X < CH2 == CH - CH2 - X < PhCH2 - X$ (2) $(CH3)2CH - X < CH3 - CH2 - X < CH2 == CH - CH2X < PhCH2 - X$ (3) $PhCH2 - X < (CH3)2CH - X < CH3 - CH2 - X < CH2 == CH - CH2 - X$ (4) $CH2=CH-CH2-X < Ph - CH2 - X < (CH3)2CH - X < CH3 - CH2 - X$ 115. $Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene. Reason R: Benzoic acid is soluble in hot water. choose the most appropriate answer from the options given below.$ (1) $Both A and R are true and R is the correct explanation of A.$ (2) $Both A and R are true but R is NOT the correct explanation of A.$ (3) $A is true but R is false.$ (4) $A is false but R is true.$ 116. $The technique used for purification of steam volatile water immiscible substance is:$ (1) $Fractional distillation$ (2) $Fractional distillation under reduced pressure$ (3) $Distillation$ (4) $Steam distillation$ 117. $Match List-I with List-II List-I (Mixture) (A) Chloroform & Aniline (B) Benzoic acid & Napthalene (C) Water & Aniline (D) Napthalene & Sodium chloride List-II (Purification Process) (I) Steam distillation (II) Sublimation (III) Distillation (IV) Crystallisation$ (1) $(A)-(IV), (B)-(III), (C)-(I), (D)-(II)$ (2) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (3) $(A)-(III), (B)-(IV), (C)-(II), (D)-(I)$ (4) $(A)-(III), (B)-(IV), (C)- (I)_{(} (D)-(II)$ 118. $Which of the following does not show geometrical isomerism ?$ (1) $1,2-Dichloro-1-pentene$ (2) $1,3-Dichloro-2-pentene$ (3) $1,1-Dichloro-1-pentene$ (4) $1,4-Dichloro-2-pentene$ 119. $The correct decreasing order for acid strength is:$ (1) $NO_{2} CH_{2} COOH > FCH_{2} COOH > CNCH_{2} COOH > ClCH_{2} COOH$ (2) $FCH_{2} COOH > NCCH_{2} COOH > NO_{2} CH_{2} COOH > ClCH_{2} COOH$ (3) $CNCH_{2} COOH > O_{2} NCH_{2} COOH > FCH_{2} COOH > ClCH_{2} COOH$ (4) $NO_{2} CH_{2} COOH > NCCH_{2} COOH > FCH_{2} COOH > ClCH_{2} COOH$ 120. $The potassium ferrocyanide solution gives a Prussian blue colour, when added to :$ (1) $C o C l_{3}$ (2) $F e C l_{2}$ (3) $C o C l_{2}$ (4) $F e C l_{3}$