Hydrocarbons PYQs Set 8 (PDF)

Set 8 of 15 · Questions 211-240 of 435

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Mere Teacher · Previous Year Questions NEET Chemistry · Hydrocarbons · Set 8 (Q211-240)
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211. $Consider the following reaction : The product 'X' is used :$ (1) $in laboratory test for phenols$ (2) $in protein estimation as an alternative to ninhydrin$ (3) $in acid base titration as an indicator$ (4) $as food grade colourant$ 212. $Which of the following compounds produces an optically inactive compound on hydrogenation?$ (1) (2) (3) (4) 213. $C_{3} H_{4} + H_{2} O \to Hg 2 + / H + 333 K [X] ⇌ T automerisation Y X and Y are respectively$ (1) $unsaturated alcohol, aldehyde$ (2) $saturated alcohol, ketone$ (3) $unsaturated alcohol, ketone$ (4) $saturated alcohol, aldehyde$ 214. $The molecular formula of the product formed when benzene is reacted with excess of chlorine molecules under ultra-violet light is$ (1) $C_{6} Cl_{6}$ (2) $C_{6} H_{3} Cl_{3}$ (3) $C_{6} H_{2} Cl_{4}$ (4) $C_{6} H_{6} Cl_{6} .$ 215. $In the given reaction the product P is$ (1) (2) (3) (4) 216. $Which of the following reactions will yield 2, 2- dibromopropane?$ (1) $CH \equiv CH + 2HBr \to$ (2) $CH3 - CH = CH2 + HBr \to$ (3) $CH3 - C \equiv CH + 2HBr \to$ (4) $CH3CH = CHBr + 2HBr \to$ 217. $In the following reaction H_{3} C-C\equivCH Red Hot Iron Tube 873 K A number of (σ) bond present in product (A) is -$ (1) $21$ (2) $9$ (3) $24$ (4) $18$ 218. $The correct acidic order of the following is I.$ (1) $I > II > III$ (2) $III > I > II$ (3) $II > III > I$ (4) $I > III > II$ 219. $But-2-yne is reacted separately with one mole of Hydrogen as shown below: B Na liq NH_{3} CH_{3} - + H_{2} C \equiv C - CH_{3} Pd/C Δ A Identify the incorrect statements from the options given below: A. A is more soluble than B. B. The boiling point & melting point of A are higher and lower than B respectively. C. A is more polar than B because dipole moment of A is zero. D. B r_{2} adds easily to B than A.$ (1) $B and C only$ (2) $B, C and D only$ (3) $A, C and D only$ (4) $A and B only$ 220. $The restricted rotation about carbon carbon double bond in 2‐butene is due to$ (1) $overlap of one s and s p^{2} ‐hybridized orbitals$ (2) $overlap of two s p^{2} ‐hybridized orbitals$ (3) $overlap ofone p and one s p^{2} ‐ hybridized orbitals$ (4) $sideways overlap of two p‐orbitals.$ 221. $In the following reaction: Product ‘P’ will not give$ (1) $Tollens’ reagent test$ (2) $Brady’s reagent test$ (3) $Victor Meyer test$ (4) $Iodoform test$ 222. $Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is$ (1) $CH\equivCH$ (2) $C H_{4}$ (3) $C H_{3} - C H_{3}$ (4) $C H_{2} = C H_{2}$ 223. $The pair of electrons in the given carbanion, C H_{3} C \equiv C^{-}, is present in which of the following orbitals?$ (1) $s p^{2}$ (2) $s p$ (3) $2 p$ (4) $s p^{3}$ 224. $Which from following molecules does not contain nitrogen in it?$ (1) $Pyrrole$ (2) $Piperidine$ (3) $Pyridine$ (4) $Pyran$ 225. $Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?$ (1) $-CH2Cl$ (2) $-COOH$ (3) $-CHCl2$ (4) $-CHO$ 226. $Benzene reacts with chlorine in sunlight to give a final product$ (1) $CCl_{4}$ (2) $C_{6} H_{6} Cl_{6}$ (3) $C_{6} Cl_{6}$ (4) $C_{6} H_{5} Cl$ 227. $Acetylene and dil. H2SO4 reacts to produce :$ (1) $CH3COOH$ (2) $CH3CHO$ (3) $CH3COCH3$ (4) $None of these$ 228. $The state of hybridisation of C_{2}, C_{3}, C_{5} and C_{6} of the hydrocarbon, is in the following sequence$ (1) $s p^{3}, s p^{2}, s p^{2} and s p$ (2) $s p, s p^{2}, s p^{2} and s p^{3}$ (3) $s p, s p^{2}, s p^{3} and s p^{2}$ (4) $s p, s p^{3}, s p^{2} and s p^{3}$ 229. $Identify products A and B dil . KMn O_{4} 273 K A Cr O_{3} B$ (1) (2) (3) $A: O \| \| OHC - C H_{2} C H_{2} C H_{2} - C - C H_{3} B: O \| \| HOOC - C H_{2} C H_{2} C H_{2} - C - C H_{3}$ (4) 230. $The reactive species in the nitration of benzene is$ (1) $N O_{3}$ (2) $H N O_{3}$ (3) $N O_{2}^{+}$ (4) $N O_{2}^{-}$ 231. $Structural formula of Lewisite is :$ (1) $C H C l = C H A s C l_{3}$ (2) $C H C l = C H A s C l$ (3) $C H C l = C H A s C l_{2}$ (4) $C H_{2} = C H A s C l_{2}$ 232. $Final Product of given reaction :$ (1) (2) (3) (4) 233. $The correct statement is$ (1) $cyclohexadiene and cyclohexene cannot be isolated with ease during controlled hydrogenation of benzene$ (2) $one mole each of benzene and hydrogen when reacted gives 1/3 mole of cyclohexane and 2/3 mole unreacted hydrogen$ (3) $hydrogenation of benzene to cyclohexane is an endothermic process$ (4) $it is easier to hydrogenate benzene when compared to cyclohexene$ 234. $The following effect is known as$ (1) $inductive effect$ (2) $electromeric effect$ (3) $resonance effect$ (4) $hyperconjugation$ 235. $Electrophile that participates in nitration of benzene is$ (1) $NO^{+}$ (2) $NO_{2}^{+}$ (3) $NO$ (4) $NO_{3}^{-}$ 236. $The compound that will react most readily with gaseous bromine has the formula$ (1) $C_{3} H_{6}$ (2) $C_{2} H_{2}$ (3) $C_{4} H_{10}$ (4) $C_{2} H_{4}$ 237. $Which of the following has zero dipole moment?$ (1) $1‐Butene$ (2) $2‐Methyl‐l‐propene$ (3) $cis‐2‐Butene$ (4) $trans‐2‐Butene$ 238. $Which of the following compound is formed when CH2=CH(CH2)2 COOH react with HBr ?$ (1) $CH3CHCH2CH2BrCOOH$ (2) $CH3CHBrCH2CH2COOH$ (3) $CH2BrCH2(CH2)2COOH$ (4) $CH3CH2CH2BrCH2COOH$ 239. $Acetone can easily be converted into propane by the action of :$ (1) $HΙ$ (2) $H3PO3$ (3) $HNO3$ (4) $HΙO3$ 240. $In acetylene molecule, between the carbon atoms there are$ (1) $three pi bonds$ (2) $one sigma and two pi bonds$ (3) $two sigma and one pi bonds$ (4) $three sigma bonds.$