propane

butane

pentane

A) C2H6O

B) C3H8

C) C2H4O2

D) C2H5OH

Yes

No

Compounds with different molecular formula and structural formula

Compounds with the same molecular formula and structural formula

Compounds with the same structural formula but a different molecular formula

Compounds with the same molecular formula but a different structural formula.

$$C_4H_{10}$$ (n-butane)

$$C_4H_{10}$$ (isobutane)

$$C_3H_8$$ (propane)

$$C_5H_{12}$$ (pentane)

Different molecular formulas

Different physical states

Different arrangements of atoms

Different types of atoms

$$C_2H_6O$$ and $$C_2H_5OH$$

$$C_3H_6O$$ and $$C_3H_6O_2$$

$$C_4H_8$$ and $$C_4H_8$$ (cyclobutane)

$$C_5H_{12}$$ and $$C_5H_{12}$$ (neopentane)

They have identical chemical properties

They have different boiling points

They react with the same substances

They have the same melting points

They have the same structural formula

They have different molecular weights

They have the same molecular formula

They have different types of bonds

Mass spectrometry

Colorimetry

pH measurement

Conductivity test

n-pentane

isopentane

neopentane

cyclopentane

No effect

Increases solubility

Changes boiling and melting points

Decreases density

2-methylpentane

3-methylpentane

2,3-dimethylbutane

cyclohexane

Due to different molecular weights

Due to different functional groups

Due to different arrangements of atoms

Due to different types of atoms