Worksheet: Homologous Series

In this worksheet, we will practice identifying a homologous group of organic chemicals.

Q1:

In a part of the homologous series of alkanes, from methane to hexane, what happens to the flammability as the number of carbon atoms increases?

  • AIt decreases then increases.
  • BIt increases then decreases.
  • CIt stays the same.
  • DIt increases.
  • EIt decreases.

Q2:

Why do the three molecules below all belong to the same homologous series?

CHCHHH
CCHHCHHHH
CHHCHCHHCHHH

  • AThey are all unsaturated.
  • BThe ratio of hydrogen atoms to carbon atoms is 21.
  • CThey have increasing numbers of carbon atoms.
  • DThey are all hydrocarbons.
  • EThey all contain the same functional group.

Q3:

In a part of the homologous series of alkanes, from methane to hexane, what happens to viscosity as the number of carbon atoms increases?

  • AIt decreases then increases.
  • BIt increases then decreases.
  • CIt stays the same.
  • DIt decreases.
  • EIt increases.

Q4:

What is the formula for the next alkene in this homologous series? CH24, CH36, CH48

  • ACH614
  • BCH410
  • CCH512
  • DCH612
  • ECH510

Q5:

In a part of the homologous series of alkanes, from methane to hexane, what happens to the boiling point as the number of carbon atoms increases?

  • AIt increases then decreases.
  • BIt decreases then increases.
  • CIt stays the same.
  • DIt increases.
  • EIt decreases.

Q6:

Which type of organic compound does the part of homologous series shown by the following molecules belong to?

COOHHCOCOHHHHCHHHCHHCOOH
  • AHaloalkanes
  • BAldehydes
  • CKetones
  • DCarboxylic acids
  • EAlcohols

Q7:

Fill in the blank: A homologous series could be described as a family of compounds that have the same .

  • Amolecular mass
  • Bnumber of carbon atoms
  • Cphysical properties
  • Dchemical properties
  • Emolecular formula

Q8:

Which of the following describes the general formula for an alkane?

  • ACH
  • BCH
  • CCH
  • DCH
  • ECHOH

Q9:

Which of the following describes the general formula for an alcohol?

  • ACHOH
  • BCH
  • CCH
  • DCH
  • ECHOH

Q10:

Which of the following describes the general formula for an alkene?

  • ACH
  • BCH
  • CCHOH
  • DCH
  • ECH

Q11:

Why is ethane a member of the homologous series of alkanes, but methanol is not?

  • AEthane has a smaller molecular mass.
  • BEthane is obtained from crude oil.
  • CEthane is a gas, but methanol is a liquid.
  • DEthane has two carbon atoms, but methanol only has one.
  • EEthane contains the same functional group as other alkanes.

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