Chapter 20

The addition of HBr to an alkene in the presence of peroxide is the example of (a) electrophilic addition reaction (b) nucleophilic addition reaction (c) free radical addition reaction (d) the formation of carbocation as an intermediate

Which of the following may yield a racemic monochlorinated product? (a) \(n\)-Butane (b) 2,2-Dimethylpropane (c) Isobutane (d) \(2,2,3,3\)-Tetramethylbutane

Propene on reaction with \(\mathrm{Br}_{2}\) in \(\mathrm{CCl}_{4}\) yields (a) 1,2 -dibromopropane (b) trans-1,2-dibromopropane (c) (\pm) 1.2-dibromoprpane (d) 3 -bromopropane

2-Butyne is allowed to react with \(\mathrm{H}_{2}\) in the presence of Lindlar catalyst. The major proutics formed is (a) cis-2-butene (b) trans-2butene

2-Butene on reductive ozonolysis will gives: (a) Acetaldehyde (b) Acetic Acid (c) Mixture of acetaldehyde and acetic acid \((2: 1\) ratio) (d) Mixture of acetaldehyde and acetic acid \((1: 2\) ratio)

Which among the following alkenes will be most stable? (a) Ithene (b) 2-Methylpropene (c) 2. 3. Dimethyl-but-2-ene (d) 2.Butene

Ethylene reacts with \(\mathrm{O}_{2}\) at \(200^{\circ} \mathrm{C}\) in the presence of silver powder to produce (a) ethanol (b) cthanal (c) cthanoic acid (d) oxirane

The addition of \(\mathrm{HCl}\) to \(3,3.3\)-trichloropropene gives (a) \(\mathrm{Cl}_{3} \mathrm{CCH}_{2} \mathrm{CH}_{2} \mathrm{Cl}\) (b) \(\mathrm{Cl}_{3} \mathrm{CCH}(\mathrm{Cl}) \mathrm{CH}_{3}\) (c) \(\mathrm{Cl}_{2} \mathrm{CHCH}(\mathrm{Cl}) \mathrm{CH}_{2} \mathrm{Cl}\) (d) \(\mathrm{CL}_{2} \mathrm{CHCH}_{2} \mathrm{CHCl}_{2}\)

2-Butyne is treated with sodium in liquid \(\mathrm{NH}_{3}\). The major product formed is (a) cis-2-butene (b) trans-2-butene (c) butane (d) \(1.3\)-butadiene

An alkene on reductive ozonolysis gives 2 molecules of \(\mathrm{CH}_{2}(\mathrm{CHO})_{2}\). The compound is (a) 2, 4 -hexadiene (b) 1, 3-cyclohexadiene (c) \(1.4\)-cyclohexadiene (d) 1 -methyl-1,3-cyclopentadiene

Which of the following reactions will result in the formation of a chiral center in the product? (a) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}+\mathrm{HBr} \rightarrow\) (b) \(\mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{HOBr} \rightarrow\)

Fumaric acid is allowed to react with dilute, slightly alkaline \(\mathrm{KMnO}_{4}\) solution in the cold. The produet formed is (a) ( \(\pm\) ) lactic acid (b) succinic acid (c) meso-tartaric acid (d) ( \(\pm\) ) tartaric acid

Potassium salt of 2,3 -dimethylmaleic acid on electrolysis gives: (a) acetylene (b) propyne (c) 2 -butyne (d) 1 -butyne

Propyne is produced during the hydrolysis of (a) \(\mathrm{CaC}_{2}\) (b) \(\mathrm{Al}_{4} \mathrm{C}_{3}\) (c) \(\mathrm{Mg}_{2} \mathrm{C}_{3}\) (d) SIC

The dehydration of 2 -methylbutanol with concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) produces (a) 2-methylbutene as the major product (b) 2 -methylbut-2-ene as the major product (c) pentene (d) pent-2-ene

Which of the following will give two isomeric monochloro derivatives ? (a) 2, 3-Dimethylbutane (b) \(n\)-Hexane (c) Isopentane (d) Ethane

Which among the following compounds will give mixture of two ketones on hydration with \(\mathrm{HOH} / \mathrm{H}_{2} \mathrm{SO}_{4} / \mathrm{HgSO}_{4}\) : (a) \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C}=\mathrm{C}-\mathrm{CH}_{3}\) b) \(\mathrm{CH}_{3}-\mathrm{C}=\mathrm{C}-\mathrm{CH}_{3}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{C}=\mathrm{C}-\mathrm{C}_{2} \mathrm{H}_{5}\) d) All of these

Calcium carbide reacts with water to produce (a) Ethane (b) Methane (c) Ethylene (d) Acetylene

The product of acid catalyzed hydration of 2 -phenyl propene is (a) 3-pheny12-propanol (b) 1-phenyl-2-propanol (c) 2-phenyl-2-propanol (d) 2-phenyl-1-propanol

HBr reacts with \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{OCH}_{3}\) under anhydrous conditions at \(\pi\) give (a) \(\mathrm{CH}_{3} \mathrm{CHO}\) and \(\mathrm{CH}_{3} \mathrm{Br}\) (d) \(\mathrm{H}_{3} \mathrm{C}-\mathrm{CHBr}-\mathrm{OCH}_{3}\) (c) \(\mathrm{BrCH}_{2} \mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{3}\)

Of the five isomeric hexanes, the isomer which can give two monochlorinated colnp is \(\quad\) (b) 2, 3 -dimethyl butane (a) \(n\)-hexane (d) 2-methyl pentane (c) 2, 2-dimethyl butane.

\(\stackrel{\mathrm{CH}}{\mathrm{CH}} \frac{2 \mathrm{CH}_{3} \mathrm{COOH}}{\mathrm{Hg}^{2+}} \stackrel{\mathrm{A}}{\mathrm{A}} \longrightarrow \mathrm{B}+\mathrm{C}\) In the above sequence of reactions, \(\mathrm{B}\) and \(\mathrm{C}\) respectively are (a) acid, ester (b) anhydride, ester (c) aldehyde, anhydride (d) acid, aldehyde