alkanes

Which is the structures with IUPAC nomenclature

2,2,4-trimethylpentane

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Give IUPAC nomenclature for this compound

• 2,7-dimethyl-5-ethyloctane

• 5-ethyl-2,7-dimethyloctane

• 2,7-dimethyl-3-ethyloctane

• 4-ethyl-2,7-dimethyloctane

Tags

NGSS.HS-PS1-1

Which correctly represents an incomplete combustion of pentane?

• C₅H₁₂ + 8O₂ ⟶ 5CO₂ + 6H₂O

• C₅H₁₂ + 8O₂ ⟶ 4CO + CO₂ + 6H₂O

• C₅H₁₂ + 6O₂ ⟶ 4CO + CO₂ + 6H₂O

• C₅H₁₂ + 5O₂ ⟶ 4CO + CO₂ + 4H₂O + 2H₂

The boiling points of alkane molecules increase as their molecular sizes increase.

• True

• False

Why do alkane not dissolve in water?

• they are less dense than water
• they have low melting points
• they are non-polar compounds 
• they are chemically less reactive

Name the following alkane:

• 2-methylpentane

• 1-methylhexane

• 1,1-dimethylpentane

• 1,2-dimethylbutane

Which of the following products may be formed from the cracking of heavy oil fraction?

(1) CO

(2) C₂H₄

(3) C₈H₁₈

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

C₁₀H₂₂ -----> C₆H₁₄ + 2 X

Which of the following concerning the above process and X is correct?

• fractional distillation and an alkane

• fractional distillation and an alkene

• cracking and an alkane

• cracking and an alkene

Which of the following statements concerning the compounds C₂H₄, C₃H₆ and C₄H₁₀ is correct?

• They belong to the same homologous series.

• They are unsaturated hydrocarbons.

• They are gases at room temperature and pressure.

• They have the same physical properties.

What process is used to separate crude oil in hydrocarbons with different chain lengths?

• distillation

• fractional distillation

• cracking

• polymerisation