General Organic Chemistry PYQs Set 6 (PDF)

Set 6 of 25 · Questions 151-180 of 724

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Mere Teacher · Previous Year Questions JEE Main Chemistry · General Organic Chemistry · Set 6 (Q151-180)
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151. $Cyclic hydrocarbon ‘A’ has all the carbon and hydrogen atoms in a single plane. All the carbon ‐carbon bonds have the same length, less than 1.54 Å, but more than 1.34 Å. The bond angle will be$ (1) $10928’$ (2) $10 0^{o}$ (3) $18 0^{o}$ (4) $12 0^{o}$ 152. $Which of the following belongs to the homologous series of C_{5} H_{8} O_{2} N ?$ (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) $C_{6} H_{10} O_{2} N$ 153. $Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of$ (1) $S and Cl$ (2) $N and S$ (3) $N$ (4) $S$ 154. $An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be :$ (1) $Optically active mixture$ (2) $Pure enantiomer$ (3) $Meso compound$ (4) $Racemic mixture$ 155. $When difference in boiling points of two liquids is too small, then the separation is carried out by$ (1) $steam distillation$ (2) $simple distillation$ (3) $fractional distillation$ (4) $vacuum distillation$ 156. $In Duma’s method for estimation of nitrogen, 0.25 g of an organic compound gave 40 m L of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 Kis 25 mm, the percentage of nitrogen in the compound is$ (1) $16.76$ (2) $15.76$ (3) $17.36$ (4) $18.20$ 157. $The correct statement(s) about the compound H3C(HO)HC-CH=CH- C H (O H) C H_{3} (X) is(are) :$ (1) $The total number of stereoisomers possible for X is 6.$ (2) $The total number of diastereomers possible for X is 3.$ (3) $If the stereochemistry about the double bond in X is trans, the number of enantiomers possible for X is 4.$ (4) $If the stereochemistry about the double bond in X is cis, the number of enantiomers possible for X is 2.$ 158. $An organic compound ‘A’ is oxidized with Na_{2} O_{2} followed by boiling with HNO_{3} . The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is :$ (1) $Nitrogen$ (2) $phosphorus$ (3) $Fluorine$ (4) $Sulphur$ 159. $Given below are two statements: Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. choose the correct answer from the options given below:$ (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) $Statement I is true but Statement II is false$ 160. $Which one of the following is most reactive towards electrophilic attack?$ (1) (2) (3) (4) 161. $An oxygen containing organic compound was found to contain 52 % carbon and 13 % of hydrogen. Its vapour density is 23 . The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is$ (1) $ethanol$ (2) $ethanal$ (3) $methoxy methane$ (4) $methoxy ethane.$ 162. $Or der nucleophilicity (i) O H^{-} (ii) H S^{-} (iii) Ph- O^{-} (iv) C_{2} H_{5} - O^{-}$ (1) $i > ii > iii > iv$ (2) $ii > iv > i > iii$ (3) $ii > iii > i > iv$ (4) $iii > iv > i > ii$ 163. $Identify correct statement/s:(A) - OCH_{3} and - NHCOCH_{3} are activating group. (B) -CN and OH are meta directing group. (C) -CN and - SO_{3} H are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below:$ (1) $(A) only$ (2) $(A), (B) and (E) only$ (3) $(A) and (C) only$ (4) $(A), (C) and (D) only$ 164. $Which will not show geometrical isomerism ?$ (1) $CH3CH = NOH$ (2) (3) $HO - N = N - OH$ (4) $(CH3)2C = NOH$ 165. $The correct order of increasing basicity of the given conjugate bases (R = CH3) is :$ (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) $R C O O - < H C^{o} C - < N - H_{2} < R -$ 166. $Given below are four compounds:(A) n-propyl chloride (B) iso-propyl chloride(C) sec-butyl chloride (D) neo-pentyl chloride Percentage of carbon in the one which exhibits optical isomerism is:$ (1) $56$ (2) $40$ (3) $52$ (4) $46$ 167. $The functional group, which is found in amino acid is$ (1) $- COOH group$ (2) $- NH2 group$ (3) $- CH3 group$ (4) $both (a) and (b).$ 168. $Assertion : Addition of bromine to trans-2-butene yields meso-2. 3-dibromobutane. Reason : Addition of bromine to an alkene is an electrophilic addition.$ (1) $Both Assertion and Reason are true and Reason is the correct explanation of Assertion.$ (2) $Both Assertion and Reason are true but Reason is not correct explanation of Assertion.$ (3) $Assertion is true but Reason is false.$ (4) $Assertion is false but Reason is true.$ 169. $Presence of halogen in organic compounds can be detected using$ (1) $Leibigs' test$ (2) $Kjeldahl's test$ (3) $Duma's test$ (4) $Beilstein's test.$ 170. $Which one of the following shows functional isomerism?$ (1) $C_{2} H_{4}$ (2) $C_{2} H_{5} OH$ (3) $C_{3} H_{6}$ (4) $CH_{2} Cl_{2}$ 171. $Identify correct statements from the following :(A) Propanal and propanone are functional isomers.(B) Ethoxyethane and methoxypropane are metamers.(C) But-2-ene shows optical isomerism.(D) But-1-ene and but-2-ene are functional isomers.(E) Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below:$ (1) $(A) (B) and (C) only$ (2) $(B) (C) and (D) only$ (3) $(C) (D) and (E) only$ (4) $(A) (B) and (E) only$ 172. $Given below are two statements: Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with FeSO_{4} and Na_{4} (Fe (CN)_{6}) choose the correct answer from the options given below.$ (1) $Statement I is true but Statement II is false$ (2) $Both Statement I and Statement II are false$ (3) $Both Statement I and Statement II are true$ (4) $Statement I is false but Statement II is true$ 173. $In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 m L ofl M H_{2} S O_{4} . The percentage ofnitrogen in the soil is$ (1) $37.33$ (2) $45.33$ (3) $35.33$ (4) $43.33$ 174. $Which of the following will have a meso-isomer also ?$ (1) $2-Chlorobutane$ (2) $2,3-Dichlorobutane$ (3) $2,3-Dichloropentane$ (4) $2-Hydroxypropanoic acid$ 175. $The predominant form of histamine present in human blood is (p K_{a}, Histidine = 6.0)$ (1) (2) (3) (4) 176. $Consider the following reaction Identify the structure of the major product ‘X’.$ (1) $H_{3} C - C H (D) - C H (C H_{3}) - C ˙ H_{2}$ (2) $H_{3} C - C H (D) - C ˙ (C H_{3}) - C H_{3}$ (3) $H_{3} C - C ˙ (D) - C H (C H_{3}) - C H_{3}$ (4) $H_{3} C - C ˙ H - C H (C H_{3}) - C H_{3}$ 177. $The number of σ bonds, π bonds and lone pair of electrons in pyridine, respectively are$ (1) $12,2,1$ (2) $11,2,0$ (3) $12,3,0$ (4) $11,3,1$ 178. $0.25 g of an organic compound " A " containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl_{2} tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g , respectively. The percentage of oxygen in compound A is %. (Nearest integer) (Given: molar mass in gmol^{- 1} H : 1, C : 12, O : 16)$ 179. $In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is \times 10^{- 1} % . (Molar mass : O = 16, S = 32, Ba = 137 in gmol^{- 1})$ 180. $Among VO_{2}^{+}, MnO_{4}^{-} and Cr_{2} O_{7}^{2 -}, the spin-only magnetic moment value of the species with least oxidising ability is _______ BM (Nearest integer). (Given atomic member V = 23, Mn = 25, Cr = 24)$