Question

question 4 (1 point)
which compound is a constitutional isomer of the compound shown below?
ch3
ch3-c-ch3
ch3
a) methane
b) pentane
c) propane
d) hexane
e) butane

Explanation:

Step1: Determine the molecular formula of the given compound

The given compound is \( (CH_3)_4C \), which is neopentane. Its molecular formula is \( C_5H_{12} \).

Step2: Determine the molecular formulas of the options

• Methane (\( CH_4 \)): \( C_1H_4 \)
• Pentane (\( CH_3CH_2CH_2CH_2CH_3 \)): \( C_5H_{12} \)
• Propane (\( CH_3CH_2CH_3 \)): \( C_3H_8 \)
• Hexane (\( CH_3(CH_2)_4CH_3 \)): \( C_6H_{14} \)
• Butane (\( CH_3CH_2CH_2CH_3 \)): \( C_4H_{10} \)

Constitutional isomers have the same molecular formula but different connectivity. Since the given compound (\( C_5H_{12} \)) and pentane (\( C_5H_{12} \)) have the same molecular formula, pentane is a constitutional isomer.

Answer:

B. pentane