Question

أي مما يلي يمثل عدد الأيزوميرات القابلة للأكسدة للصيغة $C_4H_8O$؟

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

Answer: (A)

4

Answer 2

The given formula is $C_4H_8O$. The question asks for the number of oxidizable isomers. Oxidizable isomers include primary alcohols, secondary alcohols, and aldehydes. For $C_4H_8O$, the oxidizable isomers are:

1. Aldehydes: Oxidize to carboxylic acids.

   • Butanal: $CH_3CH_2CH_2CHO$
   • 2-Methylpropanal: $(CH_3)_2CHCHO$

2. Unsaturated Alcohols:

   • But-3-en-1-ol: $CH_2=CHCH_2CH_2OH$ (Primary alcohol)
   • But-3-en-2-ol: $CH_2=CHCH(OH)CH_3$ (Secondary alcohol)
   • But-2-en-1-ol: $CH_3CH=CHCH_2OH$ (Primary alcohol)
   • 2-Methylprop-2-en-1-ol: $CH_2=C(CH_3)CH_2OH$ (Primary alcohol)

3. Cyclic Alcohols:

   • Cyclobutanol: (Secondary alcohol)
   • Cyclopropylmethanol: (Primary alcohol)
   • 2-Methylcyclopropanol: (Secondary alcohol)

If we consider only the number of primary alcohols, there are 4: But-3-en-1-ol, But-2-en-1-ol, 2-Methylprop-2-en-1-ol, and Cyclopropylmethanol.