Chapter 25

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

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) \(\mathrm{Li}-\mathrm{NH}_{3} / \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)

The addition of \(\mathrm{HCl}\) to \(3,3,3\)-trichloropropene give: (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) \(\mathrm{Cl}_{3} \mathrm{CCH}_{2} \mathrm{CH}_{2} \mathrm{Cl}=960 \quad\) Page

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

Reactivity of chlorine and bromine towards methane at \(275^{\circ} \mathrm{C}\) differs by a factor nearly (a) \(10^{3}\) (b) \(10^{4}\) (c) \(10^{2}\) (d) \(>10^{5}\)

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) \(\mathrm{CH}_{3} \mathrm{OH}\)

Antidote of Lewsite is (a) 3, 3 -dimercaptopropan-1-ol (b) 2 -mercaptopropan-1, 3 -diol (c) 2,3 -dimercaptopropan-1-ol (d) 2,2 -dimercaptopropan-1-ol

Acetylene and HCHO react in the presence of copper acetylide catalyst to form (a) 2-butyne-1, 4 -diol (b) but-2-yne-1, 2 -diol (c) but-1-yne-1, 4 -diol (d) none of these

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

Which one of these is not compatible with arenes? (a) greater stability (b) resonance (c) delocalization of \(\pi\)-electrons (d) electrophillic addition

\(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CMgCl}\) 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 ........... (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 \(\mathrm{HBr}\) to propene in the absence of peroxides, the first step involves the addition of (a) \(\mathrm{H}^{+}\) (b) \(\mathrm{Br}^{-}\) (c) \(\dot{H}\) (d) \(\mathrm{Br}\)

When ethyl bromide and \(\mathrm{n}\)-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

When ethyl bromide and \(\mathrm{n}\)-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

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 \()+\mathrm{Cl}_{2}\) uv ligh (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

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

Which of the following alkane can be prepared 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 CCCC(C)C (c) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}\)

The highest boiling point is expected for (a) iso-octane (b) \(\mathrm{n}\)-octane (c) \(2,2,3,3\)-tetramethyl butane (d) \(\mathrm{n}\)-butane

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

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

Which of th incorrect statement regarding oxymercuration-demercuration? (a) here rearrangement takes place (b) in the second step demercuration occurs that is, \(\mathrm{NaBH}_{4}\) reduces \(-\mathrm{HgOAc}_{2}\) 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 \(\mathrm{Hg}(\mathrm{OAc})_{2}\) add to double bond

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

The compound with the highest boiling point is (a) n-pentane (b) 2-methyl butane (c) 2,2 -dimethyl propane (d) n-hexane

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

Propyne \(\frac{\mathrm{HgSO}_{4}}{\mathrm{Hg}_{7} \mathrm{SO}_{4}} \rightarrow \mathrm{A} .\) Compound \(\mathrm{A}\) is (a) 2-propanal (b) propane (c) propene (d) 2 -propanone

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

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) \(\mathrm{L} \mathrm{a}_{4} \mathrm{C}_{3}\)

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

Molecular weight of an unknown compound \([\mathrm{A}]\) is 82\. Compound [A] will be (a) \(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3}\) (b) \(\mathrm{CH}_{2}=\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}\) (c) CC1=CCCC1 (d) all of these

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

vWhich of the following shows acidic character? (a) \(\mathrm{CH}_{3}-\mathrm{CH}_{3}\) (b) \(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{CH}\) (c) \(\mathrm{CH}=\mathrm{CH}_{2}\) (d) \(\mathrm{CH}_{1} \equiv \mathrm{C}-\mathrm{CH}_{3}\)

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. \(\mathrm{HCl}\) (c) conc. \(\mathrm{HBr}\) (d) conc. \(\mathrm{HCl}\) with \(\mathrm{ZnCl}_{2}\)

Reductive ozonolysis of the alkene, \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{C}=\mathrm{CH}_{2}\) will give (a) only \(\mathrm{CO}_{2}\) (b) only \(\mathrm{CH}_{2} \mathrm{O}\) (c) only \(\mathrm{CH}_{3}-\mathrm{CHO}\) (d) mixture of \(\mathrm{CH}_{3} \mathrm{CHO}, \mathrm{HCHO}\) and \(\mathrm{CO}_{2}\)

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

Which has the maximum boiling point as well as melting point out of the following: CCCCC CCC(C)C CC(C)(C)C (1) (2) (3) (a) 1 in both the cases (b) 1,2 (c) 1,3 (d) 2,1

\(\mathrm{R}-\mathrm{CH}=\mathrm{CH}_{2}+\mathrm{CCl}_{4} \stackrel{\text { Peroxide }}{\longrightarrow} \mathrm{A}\). Here, \(\mathrm{A}\) is (a) [R]C(Cl)CC(Cl)(Cl)Cl (b) (c) both are correct (d) reaction does not take place