General Organic Chemistry PYQs Set 5 (PDF)

Set 5 of 22 · Questions 121-150 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 5 (Q121-150)
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121. $Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?$ (1) (2) (3) $CH_{3} - CH_{2} - CH_{2} - C \equiv N$ (4) $H_{2} N - C (= O) - N H_{2}$ 122. $Mesomeric effect involves delocalisation of$ (1) $protons$ (2) $pi electrons$ (3) $sigma electrons$ (4) $none of these.$ 123. $Metamerism can be exhibited by the compounds containing$ (1) $monovalent functional group$ (2) $bivalent functional group$ (3) $double bond$ (4) $triple bond$ 124. $The delocalization of σ electrons of C - H bond of an alkyl group with the π electrons of benzene is observed in$ (1) $Inductive effect$ (2) $Hyperconjugation effect$ (3) $Resonance effect$ (4) $Electromeric effect$ 125. $Match List - I with List - II. List - I (Pair of Compounds) (A) 2-Methylpropene and but-1-ene (B) Cis-but-2-ene and trans-but-2-ene (C) 2-Butanol and diethyl ether (D) But-1-ene and but-2-ene List - II (Type of Isomers) (I) Stereoisomers (II) Position isomers (III) Chain isomers (IV) Functional group isomers Choose the correct answer from the options given below:$ (1) $A-II, B-I, C-IV, D-III$ (2) $A-III, B-I, C-II, D-IV$ (3) $A-I, B-IV, C-III, D-II$ (4) $A-III, B-I, C-IV, D-II$ 126. $Given below are two statements : Statement I : Aniline is less basic than acetamide. Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton. Choose the most appropriate option ;$ (1) $Statement I is true but statement II is false.$ (2) $Statement I is false but statement II is true.$ (3) $Both statement I and statement II are true.$ (4) $Both statement I and statement II are false.$ 127. $Which of the following statements is not correct?$ (1) $Double bond is shorter than a single bond.$ (2) $Sigma bond is weaker than a π (pi) bond.$ (3) $Double bond is stronger than a single bond.$ (4) $Covalent bond is stronger than hydrogen bond.$ 128. $Methods used for purification of organic compounds are based on :$ (1) $nature of compound and presence of impurity.$ (2) $neither on nature of compound nor on the impurity present.$ (3) $nature of compound only.$ (4) $presence of impurity only.$ 129. $Which one is a nucleophilic substitution reaction among the following?$ (1) $H_{3} C - C H = C H_{2} + H_{2} O H^{+} H_{3} C - C H (O H) - C H_{3}$ (2) $R C H O + R^{'} M g X \to R - C H (O H) R^{'}$ (3) $H_{3} C - C H_{2} - C H (C H_{3}) - C H_{2} - B r + N H_{3} \to H_{3} C - C H_{2} - C H (C H_{3}) - C H_{2} - N H_{2}$ (4) $C H_{3} C H O + H C N \to C H_{3} C H (O H) C N$ 130. $The decreasing order of priority for the following functional groups in the IUPAC Nomenclature is - SO_{3} H, - CN, - COOH, - OH, CHO$ (1) $- COOH > - SO_{3} H > - CN > - CHO > - OH$ (2) $- SO_{3} H > - COOH > - CN > - CHO > - OH$ (3) $- COOH > - SO_{3} H > - CHO > - CN > - OH$ (4) $- SO_{3} H > - COOH > - CHO > - CN > - OH$ 131. $Which one of the following conformations of cyclohexane is chiral?$ (1) $Chair$ (2) $Boat$ (3) $Twist boat$ (4) $Rigid$ 132. $A pair of compounds having the same boiling points are$ (1) $cis but-2-ene and trans but-2-ene$ (2) $n-hexane and neo-hexane$ (3) $benzene and naphthalene$ (4) $(+) butan-2-ol and (-) butan-2-ol.$ 133. $Which one of the following orders is correct regarding the —I effect of the substituents?$ (1) $- N R_{2} < - O R < - F$ (2) $- N R_{2} > - O R > - F$ (3) $- N R_{2} < - O R > - F$ (4) $- N R_{2} > - O R < - F$ 134. $Which of the following compounds does not exhibit resonance?$ (1) $C H_{3} C H_{2} O C H = C H_{2}$ (2) (3) $C H_{3} C H_{2} C H_{2} C O N H_{2}$ (4) $C H_{3} C H_{2} C H = C H C H_{2} N H_{2}$ 135. $Cyclic hydrocarbon ‘A’ has all the carbon and hydrogen atoms in a single plane. All the carbon ‐carbon bonds have the same length, less than 1.54 Å, but more than 1.34 Å. The bond angle will be$ (1) $10928’$ (2) $10 0^{o}$ (3) $18 0^{o}$ (4) $12 0^{o}$ 136. $Which of the following belongs to the homologous series of C_{5} H_{8} O_{2} N ?$ (1) $C_{6} H_{10} O_{3} N$ (2) $C_{6} H_{8} O_{2} N_{2}$ (3) $C_{6} H_{10} O_{2} N_{2}$ (4) $C_{6} H_{10} O_{2} N$ 137. $Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of$ (1) $S and Cl$ (2) $N and S$ (3) $N$ (4) $S$ 138. $An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be :$ (1) $Optically active mixture$ (2) $Pure enantiomer$ (3) $Meso compound$ (4) $Racemic mixture$ 139. $When difference in boiling points of two liquids is too small, then the separation is carried out by$ (1) $steam distillation$ (2) $simple distillation$ (3) $fractional distillation$ (4) $vacuum distillation$ 140. $In Duma’s method for estimation of nitrogen, 0.25 g of an organic compound gave 40 m L of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 Kis 25 mm, the percentage of nitrogen in the compound is$ (1) $16.76$ (2) $15.76$ (3) $17.36$ (4) $18.20$ 141. $An organic compound ‘A’ is oxidized with Na_{2} O_{2} followed by boiling with HNO_{3} . The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is :$ (1) $Nitrogen$ (2) $phosphorus$ (3) $Fluorine$ (4) $Sulphur$ 142. $Given below are two statements: Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. choose the correct answer from the options given below:$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is true but Statement II is false$ 143. $Which one of the following is most reactive towards electrophilic attack?$ (1) (2) (3) (4) 144. $An oxygen containing organic compound was found to contain 52 % carbon and 13 % of hydrogen. Its vapour density is 23 . The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is$ (1) $ethanol$ (2) $ethanal$ (3) $methoxy methane$ (4) $methoxy ethane.$ 145. $Or der nucleophilicity (i) O H^{-} (ii) H S^{-} (iii) Ph- O^{-} (iv) C_{2} H_{5} - O^{-}$ (1) $i > ii > iii > iv$ (2) $ii > iv > i > iii$ (3) $ii > iii > i > iv$ (4) $iii > iv > i > ii$ 146. $Identify correct statement/s:(A) - OCH_{3} and - NHCOCH_{3} are activating group. (B) -CN and OH are meta directing group. (C) -CN and - SO_{3} H are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below:$ (1) $(A) only$ (2) $(A), (B) and (E) only$ (3) $(A) and (C) only$ (4) $(A), (C) and (D) only$ 147. $Which will not show geometrical isomerism ?$ (1) $CH3CH = NOH$ (2) (3) $HO - N = N - OH$ (4) $(CH3)2C = NOH$ 148. $The correct order of increasing basicity of the given conjugate bases (R = CH3) is :$ (1) $R C O O - < H C \equiv C - < R - < N - H_{2}$ (2) $R - < H C \equiv C - < R C O O - < N - H_{2}$ (3) $R C O O - < N - H_{2} < H C \equiv C - < R -$ (4) $R C O O - < H C^{o} C - < N - H_{2} < R -$ 149. $Given below are four compounds:(A) n-propyl chloride (B) iso-propyl chloride(C) sec-butyl chloride (D) neo-pentyl chloride Percentage of carbon in the one which exhibits optical isomerism is:$ (1) $56$ (2) $40$ (3) $52$ (4) $46$ 150. $The functional group, which is found in amino acid is$ (1) $- COOH group$ (2) $- NH2 group$ (3) $- CH3 group$ (4) $both (a) and (b).$