Haloalkanes & Haloarenes PYQs Set 5 (PDF)

Set 5 of 9 · Questions 121-150 of 261

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Mere Teacher · Previous Year Questions NEET Chemistry · Haloalkanes & Haloarenes · Set 5 (Q121-150)
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121. $What is the product of the reaction given below?$ (1) $CH_{3} - CH_{2} - CH_{2} - OC_{2} H_{5}$ (2) $H_{3} C - C (C H_{3})_{2} - O C_{2} H_{5}$ (3) $C H_{3} - C H (C H_{3}) - C H (C H_{3}) - O C_{2} H_{5}$ (4) $H_{3} C - C (C H_{3})_{2} - O H$ 122. $The mechanism of S_{N} 1 reaction is given asA student writes general characteristics based on the given mechanism as(A) The reaction is favored by weak nucleophiles.(B) R^{\oplus} would be easily formed if the substituents are bulky(C) The reaction is accompanied by racemization. (D) The reaction is favored by non-polar solvents.Which observations are correct?$ (1) $(B) and (D)$ (2) $(A) and (C)$ (3) $(A) and (B)$ (4) $(a) (B) and (C)$ 123. $How many distinct alkenes obtained from the 3-Bromo3 -methylhexane upon treatment with alc. KOH ?$ (1) $2$ (2) $3$ (3) $4$ (4) $5$ 124. $The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is: Choose the correct answer from the options given below:$ (1) $A >B >D> C$ (2) $C > A > D > B$ (3) $D > C > B > A$ (4) $D > B > A > C$ 125. $Consider the reaction CH_{3} CH_{2} CH_{2} Br + NaCN ⟶ CH_{3} CH_{2} CH_{2} CN + NaBr This reaction will be fastest in [NEET 2016]$ (1) $ethanol$ (2) $methanol$ (3) $N, N^{’} -dimethylformamide (DMF)$ (4) $water$ 126. $The correct order of reactivity in electrophilic substitution reaction of the following compounds is :$ (1) $B > C > A > D$ (2) $D > C > B > A$ (3) $A > B > C > D$ (4) $B > A > C > D$ 127. $In a S_{N} 2 substitution reaction of the type R - C l + B r^{-} which one of the following has the highest relative rate?. C H_{3}$ (1) $C H_{3} - C (C H_{3})_{2} - C H_{2} B r$ (2) $C H_{3} C H_{2} B r$ (3) $C H_{3} C H_{2} C H_{2} B r$ (4) $C H_{3} - C H (C H_{3}) - C H_{2} B r$ 128. $Meso compounds do not show optical activity because$ (1) $they do not contain chiral carbon atoms$ (2) $they have non-superimposable mirror images$ (3) $they contain plane of symmetry$ (4) $they do not contain plane of symmetry.$ 129. $Considering the above reactions, the compound 'A' and compound 'B' respectively are :$ (1) (2) (3) (4) 130. $Identify the statement which is not correct?$ (1) $Dehydrobromination of 2-bromopentane gives pent1-ene as the major product.$ (2) $Freon 12 is manufactured by Swarts reaction.$ (3) $CHCl_{3} is stored in closed, dark coloured bottles.$ (4) $Chronic exposure to CHCl_{3} causes liver damage.$ 131. $The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :$ (1) $(iv) < (i) < (iii) < (ii)$ (2) $(iv) < (i) < (ii) < (iii)$ (3) $(i) < (ii) < (iii) < (iv)$ (4) $(iv) < (iii) < (ii) < (i)$ 132. $An alkyl halide X (C_{4} H_{9} Br) undergoes nucleophilic substitution by S_{N} 2 reaction. The product of X on reaction with Mg / dry ether followed by D_{2} O is$ (1) (2) (3) (4) 133. $The reaction in which two molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl is an example of$ (1) $Wurtz-Fittig reaction$ (2) $Wurtz reaction$ (3) $Rosenmund reaction$ (4) $Balz-Schiemann reaction.$ 134. $Which one of the following will be most reactive for S_{N} 1 reaction?$ (1) (2) (3) (4) 135. $The maximum number of possible optical isomers in 1-bromo-2-methyl cyclobutane is$ (1) $4$ (2) $2$ (3) $8$ (4) $16$ 136. $Which of the following compounds will form the precipitate with aq. AgNO solution most readily?$ (1) (2) (3) (4) 137. $Identify the product of the following reaction.$ (1) $C_{6} H_{5} - C H_{2} - C H (B r) - C H_{3}$ (2) $C_{6} H_{5} - C H (B r) - C H_{2} - C H_{3}$ (3) $C_{6} H_{5} - CH_{2} - CH_{2} - CH_{2} - Br$ (4) $C_{6} H_{4} (B r) - C H_{2} - C H_{2} - C H_{3}$ 138. $The rate S_{N} 1 reaction will be faster for which of the following bromides?$ (1) (2) (3) (4) $H_{3} C - C H (B r) - C H_{3}$ 139. $Match the LIST-I with LIST-II List-I (Chloro derivative) (A) Vinyl Chloride (B) Benzyl chloride (C) Alkyl chloride (D) Allyl chloride List-II (Example) (I) CH_{2} = CH - CH_{2} Cl (II) CH_{3} = CH (Cl) CH_{3} (III) CH_{2} = CHCl (IV) C_{6} H_{5} -CH(CH_{3})-Cl Choose the correct answer from the options given below:$ (1) $A-III, B-IV, C-I, D-II$ (2) $A-I, B-II, C-IV, D-III$ (3) $A-IV, B-I, C-III, D-II$ (4) $A-III, B-IV, C-II, D-I$ 140. $While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is$ (1) $CONH_{2} > COCH_{3} > CH_{2} OH > CHO$ (2) $CON H_{2} > COC H_{3} > CHO > C H_{2} OH$ (3) $COCH_{3} > CONH_{2} > CHO > CH_{2} OH$ (4) $CHO > CH_{2} OH > COCH_{3} > CONH_{2}$ 141. $The order of reactivity of the compounds C_{6} H_{5} C H_{2} B r, C_{6} H_{5} C H (C_{6} H_{5}) B r, C_{6} H_{5} C H (C H_{3}) B r and C_{6} H_{5} C (C H_{3}) (C_{6} H_{5}) B r in S_{N} 2 reaction is$ (1) $C_{6} H_{5} - C (C H_{3}) (C_{6} H_{5}) - B r < C_{6} H_{5} - C H (C_{6} H_{5}) - B r < C_{6} H_{5} - C H (C H_{3}) - B r < C_{6} H_{5} - C H_{2} - B r$ (2) $C_{6} H_{5} - C H_{2} - B r < C_{6} H_{5} - C H (C H_{3}) - B r < C_{6} H_{5} - C H (C_{6} H_{5}) - B r < C_{6} H_{5} - C (C H_{3}) (C_{6} H_{5}) - B r$ (3) $C_{6} H_{5} - C H (C H_{3}) - B r < C_{6} H_{5} - C H_{2} - B r < C_{6} H_{5} - C H (C_{6} H_{5}) - B r < C_{6} H_{5} - C (C H_{3}) (C_{6} H_{5}) - B r$ (4) $C_{6} H_{5} - C H (C_{6} H_{5}) - B r < C_{6} H_{5} - C H_{2} - B r < C_{6} H_{5} - C H (C H_{3}) - B r < C_{6} H_{5} - C (C H_{3}) (C_{6} H_{5}) - B r$ 142. $As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?(A) The magnitude of negative charge is more on chlorine atom.(B) The C-Cl bond has partial double bond character.(C) C-Cl bond is less polar.(D) C-Cl bond is longer due to repulsion between delocalised electrons of the aromatic ring and lone pairs of electrons of chlorine.(E) The C-Cl bond is formed using sp^{2} hybridised orbital of carbon. Choose the correct answer from the options given below:$ (1) $(B), (C) and (E) Only$ (2) $(A), (C) and (E) Only$ (3) $(A), (D) and (E) Only$ (4) $(B), (C) and (D) Only$ 143. $The Swarts reaction yields$ (1) $iodohydrocarbons$ (2) $fluorohydrocarbons$ (3) $bromohydrocarbons$ (4) $chlorohydrocarbons$ 144. $The major product of the following reaction is:$ (1) $C H_{3} C H_{2} - C (C O_{2} C H_{2} C H_{3}) = C H_{2}$ (2) $C O_{2} C H_{2} C H_{3} - C H_{3} = C H C H_{3}$ (3) (4) 145. $Given below are two statements: Statement I: The conversion C H_{3} C H_{2} C H_{2} C H_{2} Cl H O^{-} C H_{3} C H_{2} C H_{2} C H_{2} OH + C l^{-} proceeds well in the less polar medium. Statement II: The conversion C H_{3} C H_{2} C H_{2} C H_{2} Cl R_{3} N C H_{3} C H_{2} C H_{2} C H_{2} - N^{+} R_{3} C l^{-} proceeds well in the more polar medium. Choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are true$ (2) $Statement I is true but Statement II is false$ (3) $Statement I is false but Statement II is true$ (4) $Both Statement I and Statement II are false$ 146. $Which of the following compounds will show retention in configuration on nucleophilic substitution by O H^{-} ion?$ (1) $C H_{3} - C H (C_{6} H_{5}) - B r$ (2) $C H_{3} - C H (C H_{3}) - B r$ (3) $C H_{3} - C H (C_{2} H_{5}) - C H_{2} - B r$ (4) $C H_{3} - C (B r) (C_{6} H_{13}) - H$ 147. $Which of the following sequence of reactions is suitable to synthesize chlorobenzene? [NEET 2022]$ (1) $Phenol, NaN O_{2}, HCl, CuCl$ (2) $Benzene, HCl$ (3) $Aniline, HCl, heating$ (4) $Benzene, C l_{2}, anhydrous FeC l_{3}$ 148. $Given below are two statements : Statement (I) : S_{N} 2 reactions are 'stereospecific', indicating that they result in the formation of only one stereoisomer as the product. Statement (II) : S_{N} 1 reactions generally result in formation of product as racemic mixtures. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Both Statement I and Statement II are false$ (2) $Statement I is false but Statement II is true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are true$ 149. $In case of R, S configuration the group having highest priority is$ (1) $- NO_{2}$ (2) $- NH_{2}$ (3) $- CN$ (4) $- OH$ 150. $The compound A (major product) is$ (1) (2) (3) (4)