Chapter 25

Natural gas is composed primarily of (a) methane (b) \(\mathrm{n}\)-butane (c) n-octane (d) a mixture of alkanes

Alkanes mainly undergo reactions having (a) free radical reaction (b) ionic elimination (c) electrophillic addition (d) heat/photochemical substitution

Carbon black, which is used in making printer's ink is obtained by the decomposition of (a) acetylene (b) benzene (c) carbon tetrahedral (d) methane

Addition of HCN to ethyne in the presence of \(\mathrm{Ba}(\mathrm{CN})_{2}\) as a catalyst gives (a) vinyl cyanide (b) ethyl cyanide (c) 1,1 -dicyanoethane (d) divinyl cyanide

The reagent used for the following conversion, \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH} \longrightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}\) is (a) \(\mathrm{LiAlH}_{4}\) (b) amalgamated zinc and concerntrated \(\mathrm{HCl}\) (c) red phosphorus and concentrated HI (d) soda lime

Acetylene reacts with acetic acid in presence of \(\mathrm{Hg}^{+}\) ions at room temperature to give (a) ethyl acetate (b) acetaldehyde (c) vinyl acetate (d) methyl acetate

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

Which of the following is used for the conversion of 2-hexyne into trans-2-hexane? (a) \(\mathrm{H}_{2} / \mathrm{Pd} / \mathrm{BaSO}_{4}\) (b) \(\mathrm{H}_{2}, \mathrm{PtO}_{2}\) (c) \(\mathrm{NaBH}_{4}\) (d) \(\mathrm{Li}-\mathrm{NH}_{3} / \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)

Which one of the following has the minimum heat of hydrogenation per mole? (a) 1-butene (b) trans-2-butene (c) cis-2-butene (d) 1,3 -butadiene

Isopropyl bromide on Wurtz reaction gives (a) hexane (b) propane (c) 2, 3 -dimethyl butane (d) neo-hexane

The product formed by acid catalysed hydration of 2-phenyl propene is (a) 3-phenyl-2-propanol (b) 1-phenyl-2-propanol (c) 2-phenyl-2-propanol (d) 2-phenyl-1-propanol

Among the following compounds, the strongest acid is (a) \(\mathrm{HC} \equiv \mathrm{CH}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{6}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (d) \(\mathrm{CH}_{3} \mathrm{OH}\)

The number of possible enantiomeric pairs that can be produced during monochlorination of 2 -methyl butane are (a) 2 (b) 3 (c) 4 (d) 1

The intermediate product formed during the addition of \(\mathrm{HCl}\) to propene in presence of peroxide is (a) \(\mathrm{CH}_{3} \mathrm{CHCH}_{2} \mathrm{Cl}\) (b) \(\mathrm{CH}_{3} \mathrm{CHCH}_{3}\) (c) \(\mathrm{CH}_{3} \dot{\mathrm{C}} \mathrm{H}_{2} \mathrm{CH}_{2}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2}\)

Which will have smallest heat of hydrogenation per mole? (a) cis-2-butene (b) trans-2-butene (c) 1,3 -butadiene (d) 1 -butene

When cyclohexane is poured on water, it floats because (a) cyclohexane is in boat form (b) cyclohexane is in chair form (c) cyclohexane is in crown form (d) cyclohexane is less dense than water

\(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CMgCl}\) on reaction with \(\mathrm{D}_{2} \mathrm{O}\) produces (a) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CD}\) (b) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{OD}\) (c) \(\left(\mathrm{CD}_{3}\right)_{3} \mathrm{CD}\) (d) \(\left(\mathrm{CD}_{3}\right)_{3} \mathrm{OD}\)

The treatment of benzene with isobutene in the presence of sulphuric acid gives (a) isobutyl benzene (b) n-butyl benzene (c) tert-butyl benzene (d) cumene

Addition of water to acetylene compounds is catalysed by .......... and \(\ldots \ldots \ldots\) (a) \(\mathrm{Ba}^{+2}\) salt and \(\mathrm{HgSO}_{4}\) (b) \(\mathrm{Hg}^{+2}\) salt and conc. acid (c) \(\mathrm{Hg}^{+2}\) salt and dil. acid (d) \(\mathrm{H}_{2} \mathrm{O} / \mathrm{H}^{+}\)

Toluene on oxidation with chromyl chloride produces (a) benzaldehyde (b) benzoic acid (c) acetophenone (d) benzyl alcohol

On the addition of HBr to propene in the absence of peroxides, the first step involves the addition of (a) \(\mathrm{H}^{+}\) (b) \(\mathrm{Br}^{-}\) (c) \(\dot{H}\) (d) \(\dot{B} \mathbf{r}\)

When ethyl bromide and n-propyl bromide is allowed to react with sodium, in ether, they form (a) mixture of four alkanes (b) mixture of three alkanes (c) mixture of two alkanes (d) single alkane

Which of the following will have the least hindered rotation around carbon- carbon bond? (a) ethane (b) ethylene (c) acetylene (d) hexachloroethane

The reaction conditions leading to provide the best yield of \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}\) are (a) \(\mathrm{C}_{2} \mathrm{H}_{6}(\) excess \()+\mathrm{Cl}_{2} \stackrel{\text { uv ligh }}{\longrightarrow}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{6}+\mathrm{Cl}_{2} \stackrel{\text { dark, room temperature }}{\longrightarrow}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{6}+\mathrm{Cl}_{2}\) (excess) \(\stackrel{\text { uv ligh }}{\longrightarrow}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{6}+\mathrm{Cl}_{2} \stackrel{\text { uv ligh }}{\longrightarrow}\)

Octane number of gasoline can be increased by the addition of BTX. BTX stands for (a) Butane, TEL, xylene (b) Butane, tetramethyl lead, xylene (c) Benzene, toluene, xylene (d) Benzene, TEL, xylene

The major product obtained on the treatment of \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{F}) \mathrm{CH}_{3}\) with \(\mathrm{CH}_{3} \mathrm{O}^{-} / \mathrm{CH}_{3} \mathrm{OH}\) is (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}\left(\mathrm{OCH}_{3}\right) \mathrm{CH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OCH}_{3}\)

Which of the following alkane can be prepared in large amounts by Wurtz reaction? (a) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}\) (b) CCC (c) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}\)

In which reaction, the product from antiMarkovnikov's rule is observed? (a) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2} \stackrel{\mathrm{HCl}}{\longrightarrow}\) (b) \(\mathrm{ClCH}=\mathrm{CH}_{2} \stackrel{2}{\mathrm{HCl}}\) (c) \(\mathrm{CH}_{3} \mathrm{OCH}=\mathrm{CH}_{2} \stackrel{\mathrm{HCl}}{\longrightarrow}\) (d) None of these

Acidic hydrogen is present in (a) ethyne (b) ethene (c) benzene (d) ethane

Which is not a product when O=C1C(O)CCC(O)C1O is treated with \(\mathrm{HIO}_{4} ?\) (a) \(\mathrm{HCOOH}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{HCHO}\) (d) \(\mathrm{CO}_{2}\)

Anti-Markovnikov's addition of HBr is not observed in (a) propene (b) but-1-ene (c) but-2-ene (d) pent-3-ene

Which is an incorrect statement regarding oxymercuration-demercuration? (a) here rearrangement takes place (b) in the second step demercuration occurs that is, \(\mathrm{NaBH}_{4}\) reduces-HgOAc \(_{2}\) group to hydrogen (c) the net reaction is addition of water according to Markovnikov's rule (d) In the first step oxymercuration occurs, that is, water and \(\mathrm{Hg}(\mathrm{OAc})\), add to double bond

Baeyer's reagent is (a) acidified permanganate solution (b) alkaline permanganate solution (c) neutral permanganate solution (d) aqueous bromine solution

Which of the following will not give an alkene when treated with \(\mathrm{Ph}_{3} \mathrm{P}=\mathrm{CH}_{2} ?\) (a) \(\mathrm{R}_{2} \mathrm{C}=\mathrm{C}=\mathrm{O}\) (b) \(\mathrm{RNCO}\) (c) RNC (d) \(\mathrm{R}_{2} \mathrm{C}=\mathrm{NR}\)

Which of the following will show geometrical isomerism? (a) 2-methyl butene (b) propene (c) vinyl chloride (d) but-2-ene

In the given reaction \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3} \stackrel{\mathrm{Na} / \mathrm{NH}_{3}(\mathrm{I})}{\longrightarrow}[\mathrm{X}]\) will be (a) butane (b) trans-2-butene (c) cis-2-butene (d) 1-butene

Which hydrocarbon has the highest octane number? (a) methane (b) ethane (c) iso-octane (d) triptane

In the reaction sequence (A) will be CC1=CCCC1 (a) 1-bromo-2- ethyl cyclopentane (b) 1 -bromo-1-methyl cyclopentane (c) 1 -bromo- 5 -methyl cyclopentane (d) 5-bromo-1-methyl cyclopentane

Which of the following gives propyne on hydrolysis? (a) \(\mathrm{Al}_{4} \mathrm{C}_{3}\) (b) \(\mathrm{Mg}_{2} \mathrm{C}_{3}\) (c) \(\mathrm{B}_{4} \mathrm{C}\) (d) \(\mathrm{La}_{4} \mathrm{C}_{3}\)

Which among the following reagents converts cyclohexene into trans diol? (a) Baeyer reagent (b) \(\mathrm{OsO}_{4}\) (c) \(\mathrm{I}_{2} / \mathrm{CH}_{3} \mathrm{COOAg}\) (wet) (d) \(\mathrm{I}, / \mathrm{CH}_{3} \mathrm{COOAg}\) (dry)

The product formed on reaction of HBr with propene is (a) 1 -bromoproapne (b) 2-bromopropane (c) 3 -bromopropane (d) no reaction occurs

Potassium salt of 2,3 -dimethyl maleic acid on electrolysis gives (a) ethyene (b) propyne (c) 2 -butyne (d) 1 -butyne

Which among the following alkyne will give an aldehyde on hydroboration oxidation reaction? (a) \(\mathrm{CH} \equiv \mathrm{CH}\) (b) \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}\) (c) \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}\) (d) all of these

Which of the reagents on reaction with cyclohexanol gives best yield of cyclohexene? (a) conc. \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (b) conc. HCl (c) conc. HBr (d) conc. \(\mathrm{HCl}\) with \(\mathrm{ZnCl}_{2}\)

Which of the reagents on reaction with cyclohexanol gives best yield of cyclohexene? (a) conc. \(\mathrm{H}_{3} \mathrm{PO}_{4}\) (b) conc. HCl (c) conc. HBr (d) conc. \(\mathrm{HCl}\) with \(\mathrm{ZnCl}_{2}\)

In the preparation of alkene from alcohol using \(\mathrm{Al}_{2} \mathrm{O}_{3}\), which is the most effective factor? (a) porosity of \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (b) temperature (c) surface area of \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (d) concentration

To \(0.037 \mathrm{~g}\) of an alcohol, \(\mathrm{R}-\mathrm{OH}\) was added to \(\mathrm{CH}_{3} \mathrm{MgI}\) and the gas evolved measured \(11.2 \mathrm{~cm}^{3}\) at STP. What is the molecular mass of \(\mathrm{R}-\mathrm{OH}\) ? (a) 46 (b) 60 (c) 74 (d) 88

In which of the following compounds, the weight percentage of \(\mathrm{C}\) and \(\mathrm{H}\) are 80 and 20 respectively? (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{CH}_{4}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{6}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{3}\)

In the reaction of phenol with \(\mathrm{CHCl}_{3}\) and aqueous \(\mathrm{NaOH}\) at \(70^{\circ} \mathrm{C}\) (343 K), the electrophile attacking the ring is (a) \(\mathrm{CHCl}_{3}\) (b) \(\mathrm{CHCl}_{2}\) (c) \(\mathrm{CCl}_{2}\) (d) \(\mathrm{COCl}_{2}\)

Benzene reacts with \(\mathrm{CH}_{3} \mathrm{COCl}\) in the presence of anhydrous \(\mathrm{AlCl}_{3}\) to give (a) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{O}_{2} \mathrm{Cl}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCH}_{3}\)