Hydrocarbons PYQs Set 7 (PDF)

Set 7 of 15 · Questions 181-210 of 435

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrocarbons · Set 7 (Q181-210)
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181. $Which of the following is suitable to synthesize chlorobenzene?$ (1) $Aniline (C_{6} H_{5} N H_{2}), HCl, heating$ (2) $Benzene, C l_{2}, anhydrous FeC l_{3}$ (3) $Phenol, NaN O_{2}, HCl, CuCl$ (4) $Benzene, HCl$ 182. $The non-aromatic compound among the following is$ (1) (2) (3) (4) 183. $Three isomers A, B and C ( mol. formula C_{8} H_{11} N) give the following results A and c \to Diazotization P + Q \to (ii) Oxidation (KMnO_{4} + H^{+}) (i) Hydrolysis R (product ofA) + S (product ofC) R has lower boiling point than S B \to C_{6} H_{5} SO_{2} Cl alkali-insoluble product A, B and C, respectively are$ (1) (2) (3) (4) 184. $Some meta - directing substituents in aromatic substitution are given. Which one is most deactivating ?$ (1) $-SO3H$ (2) $-COOH$ (3) $-NO2$ (4) $-C\equivN$ 185. $Which of these will not react with acetylene?$ (1) $NaOH$ (2) $ammonical AgNO3$ (3) $Na$ (4) $HCl.$ 186. $Products of the following reaction :$ (1) $C H_{3} COOH + C O_{2}$ (2) $C H_{3} COOH + H O O C C H_{2} C H_{3}$ (3) $C H_{3} C H O + C H_{3} C H_{2} C H O$ (4) $C H_{3} COOH + C H_{3} C O C H_{3}$ 187. $Water does not produce CO on reacting with:$ (1) $C_{3} H_{8}$ (2) $C$ (3) $CH_{4}$ (4) $CO_{2}$ 188. $But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd / C and (ii) Na / liq . NH_{3} to give the products X and Y respectively. But-2-yne + H_{2} Pd/C X But-2-yne + H_{2} Na/Liq.NH_{3} Y Identify the incorrect statements.(A) X and Y are stereoisomers.(B) Dipole moment of X is zero.(C) Boiling point of X is higher than Y.(D) X and Y react with O_{3} / Zn + H_{2} O to give different products. Choose the correct answer from the options given below:$ (1) $(B) and (D) Only$ (2) $(A) and (C) Only$ (3) $(A) and (B) Only$ (4) $(B) and (C) Only$ 189. (1) (2) (3) (4) 190. $Ph - CH = CH_{2} (PhCOO)_{2} HBr Product Consider the above reaction(A) The reaction proceeds through a more stable radical intermediate.(B) The role of peroxide is to generate H^{\circ} (Hydrogen radical).(C) During this reaction, benzene is formed as a byproduct.(D) 1-Bromo-2-phenylethane is formed as the minor product.(E) The same reaction in absence of peroxide proceeds via carbocation intermediate. Identify the correct statements. Choose the correct answer from the options given below:$ (1) $(C), (D) & (E) Only$ (2) $(A, (B) & (D) Only$ (3) $(A) (C) & (E) Only$ (4) $(A) & (E) Only$ 191. $Least energetic conformation of cyclohexane is$ (1) $chair conformation$ (2) $boat conformation$ (3) $cis conformation$ (4) $E - Z form.$ 192. $In the following reaction CH_{3} (CH_{2})_{4} CH_{3} Anhy. AlCl_{3} HCl Δ major product X'X' is$ (1) (2) $C H_{3} C H (C H_{3}) - (C H_{2})_{2} C H_{3}$ (3) $C H_{3} (C H_{2})_{4} C H_{2} Cl$ (4) $Cl - C H_{2} - (C H_{2})_{4} - C H_{2} - Cl$ 193. $Which of the following conformers for ethylene glycol is most stable?$ (1) (2) (3) (4) 194. $Identify (P)$ (1) (2) (3) (4) 195. $The number of σ and π bonds present in pent-1-ene-4-yne is :$ (1) $3, 10$ (2) $9, 4$ (3) $4, 9$ (4) $10, 3$ 196. $Electrophile in the case of chlorination of benzene in the presence of F e C 1_{3} is$ (1) $C 1$ (2) $F e C 1_{3}$ (3) $C 1^{+}$ (4) $C 1^{-}$ 197. $Cyclopentadienyl anion is$ (1) $benzenoid and aromatic$ (2) $non-benzenoid and aromatic$ (3) $non-benzenoid and non-aromatic$ (4) $non-benzenoid and anti-aromatic$ 198. (1) (2) (3) (4) 199. $Which of the following will be most stable diazonium salt R N_{2}^{+} X^{-} ?$ (1) $C H_{3} N_{2}^{+} X^{-}$ (2) $C_{6} H_{5} N_{2}^{+} X^{-}$ (3) $C H_{3} C H_{2} N_{2}^{+} X^{-}$ (4) $C_{6} H_{5} C H_{2} N_{2}^{+} X^{-}$ 200. $With respect to the conformers of ethane, which of the following statements is true?$ (1) $Bond angle changes but bond length remains same.$ (2) $Both bond angle and bond length change.$ (3) $Both bond angle and bond length remain same.$ (4) $Bond angle remains same but bond length changes.$ 201. $The compound which gives an oily nitrosoamine on reaction with nitrous acid at low temperature, is :$ (1) $CH3NH2$ (2) $(CH3)2CHNH2$ (3) $CH3 - NH - CH3$ (4) $(CH3)3N$ 202. $The alkane from below having two secondary hydrogens is:$ (1) $4-Ethyl-3,4-dimethyloctane$ (2) $2,2,3,3-Tetramethylpentane$ (3) $2,2,4,5-Tetramethylheptane$ (4) $2,2,4,4-Tetramethylhexane$ 203. $In a reaction, CH_{2} = CH_{2} Hypoch1orous acid M R CH_{2} OH-CH_{2} OH where, M = Molecule and R = Reagent. M and R are$ (1) $C H_{3} C H_{2} O H and H C 1$ (2) $C H_{2} = C H_{2} and heat$ (3) $C H_{3} C H_{2} C 1 and NaOH$ (4) $C H_{2} C 1 - C H_{2} O H and a q . N a H C O_{3} .$ 204. $The major product (P) formed in the below reaction is H - C \equiv C - CH_{2} - CH = CH_{2} \to Br 2 (1 mol) CCl 4, 253 K P$ (1) $H - C \equiv C - CH_{2} - CH (Br) - CH_{2} (Br)$ (2) $CH (Br)_{2} - C (Br)_{2} - CH_{2} - CH = CH_{2}$ (3) $CH_{2} (Br) - CH (Br) - CH_{2} - CH = CH_{2}$ (4) $CH_{2} = CH (Br) - CH (Br) - CH = CH$ 205. $Conversion of benzene to acetophenone can be brought by$ (1) $Wurtz reaction$ (2) $Wurtz-Fittig's reaction$ (3) $Friedel-Crafts alkylation$ (4) $Friedel-Crafts acylation.$ 206. $The reagent ' X' used for the following reaction is$ (1) $Ni$ (2) $Pd / C$ (3) $LiAlH_{4}$ (4) $Na /liquid NH_{3}$ 207. $What is the number of moles of s p^{2} hybrid carbon atoms in one mole of hexa-1,4-diyne?$ (1) $5$ (2) $3$ (3) $4$ (4) $Zero$ 208. $The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is$ (1) $10 σ bonds and 3 π bonds$ (2) $8 σ bonds and 5 π bonds$ (3) $11 σ bonds and 2 π bonds$ (4) $13 σ bonds and no π bonds$ 209. $Which of the following reagents/ reactions will convert 'A' to 'B'? 4-methyl-1-methylenecyclohexane (A) \to 4-methylcyclohexane-1-carbaldehyde (B)$ (1) $PCC oxidation$ (2) $Ozonolysis$ (3) $B H_{3}, H_{2} O_{2} /^{-} OH followed by PCC oxidation$ (4) $HBr, hydrolysis followed by oxidation by K_{2} C r_{2} O_{7} .$ 210. $Given below are two statements: Statement (I): Neopentane forms only one monosubstituted derivative. Statement (II): Melting point of neopentane is higher than n-pentane. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is incorrect but Statement II is correct$ (2) $Both Statement I and Statement II are correct$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Both Statement I and Statement II are incorrect$