General Organic Chemistry PYQs Set 4 (PDF)

Set 4 of 25 · Questions 91-120 of 724

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Mere Teacher · Previous Year Questions JEE Main Chemistry · General Organic Chemistry · Set 4 (Q91-120)
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91. $In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe^{3 +} due to the formation of$ (1) $[Fe (SCN)]^{2 +}$ (2) $Fe_{4} (Fe (CN)_{6})_{3} \cdot xH_{2} O$ (3) $NaSCN$ (4) $(Fe (CN)_{5} NOS)^{4 -}$ 92. $The strongest acid amongst the following compounds is :$ (1) $CH3COOH$ (2) $HCOOH$ (3) $CH3CH2CH(Cl)CO2H$ (4) $ClCH2CH2CH2COOH$ 93. $In a hydrocarbon, mass ratio of hydrogen and carbon is 1:3, the empirical formula of hydrocarbon is$ (1) $CH4$ (2) $CH2$ (3) $C2H$ (4) $CH3$ 94. $Which of the following acid has the lowest value of acid dissociation constant$ (1) $C H_{3} CHFCOOH$ (2) $F C H_{2} C H_{2} COOH$ (3) $B r C H_{2} C H_{2} COOH$ (4) $C H_{3} CHBrCOOH$ 95. $In which of the following hyper conjugation is not possible?$ (1) (2) (3) (4) $C H_{3} - C H_{2} - C \oplus H_{2}$ 96. $The most stable carbanion among the following is$ (1) (2) (3) (4) 97. $Statement-1 : Bromobenzene upon reaction with B r_{2} /Fe gives 1,4-dibromobenzene as the major product. Statement-2 : In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.$ (1) $Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.$ (2) $Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1$ (3) $Statement-1 is True, Statement-2 is False$ (4) $Statement-1 is False, Statement-2 is True$ 98. $The decreasing order of the ratio of HCN addition to compounds A to D is (A) HCHO (B) C H_{3} C O C H_{3} (C) P h C O C H_{3} (D) PhCOPh$ (1) $D > B > C > A$ (2) $D > C > B > A$ (3) $C > D > B > A$ (4) $A > B > C > D$ 99. $For (i) I, (ii) Cl, (iii) Br, the increasing order of nucleophilicity would be$ (1) $C 1^{-} < B r^{-} < I^{-}$ (2) $I^{-} < C 1^{-} < B r^{-}$ (3) $B r^{-} < C 1^{-} < I^{-}$ (4) $I^{-} < B r^{-} < C 1^{-}$ 100. $Which of the following is NOT a pair of functional isomers?$ (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) $C_{2} H_{5} OC_{2} H_{5} and C_{3} H_{7} OCH_{3}$ 101. $Which of the following is an example of SN2 reaction ?$ (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) $(CH3)3C - Br+OH- (CH3)3COH+ Br -$ 102. $Which of the following compounds is not aromatic?$ (1) (2) (3) (4) 103. $Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine. Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method. In the light of the above statements, choose the correct answer from the options given below$ (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) $Statement I is true but Statement II is false$ 104. $An unknown alochol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :$ (1) $secondary alcohol by S_{N} 1$ (2) $tertiary alcohol by S_{N} 1$ (3) $secondary alcohol by S_{N} 2$ (4) $tertiary alcohol by S_{N} 2$ 105. $In Carius tube, an organic compound 'X' is treated with sodium peroxide to form a mineral acid 'Y'. The solution of B a C l_{2} is added to 'Y' to form a precipitate 'Z'.'Z' is used for the quantitative estimation of an extra element.' X ' could be$ (1) $Cytosine$ (2) $A nucleotide$ (3) $Methionine$ (4) $Chloroxylenol$ 106. $The Lassaigne’s extract is boiled with conc. H N O_{3} while testing for halogens. By doing so it$ (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) $increases the concentration of N O_{3}^{-} ions$ 107. $Which among the following is a set of nucleophiles?$ (1) $H^{+}, NH_{3}, Cl^{-}$ (2) $BF_{3}, H_{2} O, NH_{3}$ (3) $AlCl_{3}, BF_{3}, NH_{3}$ (4) $CN^{-}, H_{2} O, R - OH$ 108. $Which one of the following is the strongest base in aqueous solution?$ (1) $Dimethylamine$ (2) $Methylamine$ (3) $Trimethylamine$ (4) $Aniline$ 109. $Which one of the following is not true regarding electromeric effect?$ (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) $It requires an attacking reagent.$ 110. $C H_{3} Br + N u^{-} \to C H_{3} - Nu + B r^{-} The decreasing order of the rate of the above reaction with nucleophiles (N u^{-}) A to D is : [N u^{-} = (a) P h O^{-}, (b) A c O^{-}, (c) H O^{-}, (d) C H_{3} O^{-}]$ (1) $D > C > A > B$ (2) $D > C > B > A$ (3) $A > B > C > D$ (4) $B > D > C > A$ 111. $Which one of the following orders of acid strength is correct?$ (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) $RCOOH > H C \equiv C H > H O H > R O H$ 112. $Which of the following method is adopted to obtain gasoline from crude oil?$ (1) $Vacuum distillation$ (2) $Steam distillation$ (3) $Adsorption on animal charcoal$ (4) $Fractional distillation$ 113. $Match List-I with List -II: List-I (Metal Ion) (A) Mn^{2 +} (B) As^{3 +} (c) Cu^{2 +} (d) Al^{3 +} List-II (Group in Qualitative analysis) (i) Group - III (ii) Group - IIA (iii) Group - IV (iv) Group - IIB Choose the most appropriate answer from the options given below :$ (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) $(A)-(iv), (B)-(ii), (C)-(iii), (D)-(i)$ 114. $In an SN1 reaction on chiral centres there is :$ (1) $100 % racemization$ (2) $inversion more than retention leading to partial racemization$ (3) $100 % retention$ (4) $100 % inversion$ 115. $Lassaigne's test is used for detection of :$ (1) $Nitrogen and Sulphur only$ (2) $Nitrogen, Sulphur and Phosphorous Only$ (3) $Phosphorous and halogens only$ (4) $Nitrogen, Sulphur, phosphorous and halogens$ 116. $An organic compound [A](C_{4} H_{11} N), shows optical activity and gives N_{2} gas on treatment with H N O_{2} . The compound [A] reacts with P h S O_{2} Cl producing a compound which is soluble in KOH, The structure of A is:$ (1) (2) (3) (4) 117. $Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 M H_{2} S O_{4} solution. The percentage of nitrogen in the compound is_________. (Nearest integer)$ 118. $0.400 g of an organic compound (X) gave 0. 376 g of AgBr in Carius method for estimation of bromine. % of bromine in the compound (X) is (Given: Molar mass AgBr = 188 g m o l^{- 1} Br = 80 g m o l^{- 1})$ 119. $During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is % . (Given molar mass in gmol^{- 1} of Ba : 137, S : 32, O : 16)$ 120. $0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is______. [in nearest integer](Given: Molar mass of Ag is 108 g m o l^{- 1} and that of Cl is 35. 5 g m o l^{- 1})$