Review midterm 2 - the 11th Chemistry

Hydrocarbon are organic compounds with a general formula of

• A. CH.

• B. CnH2n.

• C. CnH2n+2.

• D. CxHy.

Alkene are open-chain hydrocarbons, in the molecule

• A. only have single bonds.

• B. have 1 double bond.

• C. have 1 triple bond.

• D. have a benzene ring.

The number of pi* (π) bonds in an alkyne molecule is

• A. 2.

• B. 3.

• C. 1.

• D. 4.

The number of structural isomers corresponding to the molecular formula C5H12 is

• A. 3.

• B. 4.

• C. 5.

• D. 6.

The name of the organic compound with the formula CH3-CH=C(CH3)-CH2-CH3 is

• A. 2-methylpent-2-ene.

• B. 2-methylbut-2-ene.

• C. 3-methylbut-2-ene.

• D. 3-methylpent-2-ene.

The structural formula of 2-bromopropane is

• A. CH3-CH2-CH2-Br.

• B. Br-CH2-CH2-Br.

• C. CH3-CH(Br)-CH3.

• D. CH3-CH2-Br.

The main product of the reaction of HBr with but-1-ene is

• A. 2-bromobutane.

• B. 1-bromobutane.

• C. 2-bromobut-1-ene.

• D. 1-bromobut-2-ene.

Which of the following structural formulas has geometric isomers?

• A. CH3-CH=CH-CH3.

• B. CH3-CH2-CH2-CH3.

• C. CH3-C≡C-CH3.

• D. CH2=CH-CH2-CH3.

Complete combustion of an open-chain hydrocarbon X produces 0.4 mol of CO2 and 0.4 mol of H2O. X belongs to the type

• A. alkene.

• B. alkyne.

• C. alkane.

• D. arene.

Which of the following substances does not react with KMnO4 solution under any conditions?

• A. toluene.

• B. styrene.

• C. benzene.

• D. acetylene.