Question

Draw the structural diagram for each of the following organic compounds:
1. Butanal
2. Pent-2-yne
3. The isomer of n-butane

Hint:

Carbon always forms 4 bonds. When drawing structures, double-check that every carbon atom has exactly 4 lines (bonds) connected to it!

Answer 1

1. Butanal:
Butanal is a 4-carbon aldehyde. The aldehyde group (-CHO) is always at the end of the chain.

Structural formula:
CH₃ – CH₂ – CH₂ – CHO

2. Pent-2-yne:
Pent-2-yne is a 5-carbon alkyne with a triple bond between carbon 2 and carbon 3.

Structural formula:
CH₃ – C≡C – CH₂ – CH₃

3. Isomer of n-butane:
n-butane has a straight chain. Its isomer is isobutane (2-methylpropane), which has a branched structure.

Structural formula:

        CH3
         |
  CH3 – C – CH3
  

Final Answer:
1. CH₃–CH₂–CH₂–CHO
2. CH₃–C≡C–CH₂–CH₃
3. Isobutane (2-methylpropane)