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Organic Chemistry - Hydrocarbons
16.
The reaction of ethyne with bromine water gives
- A.cis-1,2-dibromoethene
- B.trans-1,2-dibromoethene
- C.1,1,2,2-tetrabromoethane
- D.none of these
- Answer
- Report
Answer : [B]
17.
The reduction of 4-octyne with H2 in the presence of Pd/CaCO3-
quinoline gives
- A.trans-4-octene
- B.cis-4-octene
- C.a mixture of cis- and trans-4-octene
- D.a completely reduced product C8H18
- Answer
- Report
Answer : [B]
18.
On halogenation, an alkane C5H12 gives only one monohalogenated product. The alkane is
- A.n-pentane
- B.2-methylbutane
- C.2,2-dimethylpropane
- D.cyclopentane
- Answer
- Report
Answer : [C]
19.
The angle strains at the CH2 groups in cyclopropane (I), cyclobutane (II) ,
cyclopentane (III) and cyclohexane (IV) follow the order
- A.IV > III > II > I
- B.I > II > III > IV
- C.II > I > IV > III
- D.III > II > I > IV
- Answer
- Report
Answer : [B]
20.
The order of reactivity of F, Cl, Br and I in substitution reactions is
- A.F > Cl > Br > I
- B.Cl > Br > I > F
- C.I > Br > Cl > F
- D.Cl = Br > I > F
- Answer
- Report
Answer : [A]
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