KCET · Chemistry · General Organic Chemistry
Number of possible alkynes with formula \( \mathrm{C}_{5} \mathrm{H}_{8} \) is
- A \( 12 \)
- B \( 13 \)
- C \( 04 \)
- D \( 05 \)
Answer & Solution
Correct Answer
(B) \( 13 \)
Step-by-step Solution
Detailed explanation
There are only three isomers possible with formula \( \mathrm{CH}_{5} \mathrm{H}_{8} \) having structure:
(I) \( \mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \)
(II) \( \mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \)
(III) \( \mathrm{CH} \equiv \mathrm{C}-\underset{\mathrm{CH}_{3}}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_{3} \)
(I) \( \mathrm{CH} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \)
(II) \( \mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \)
(III) \( \mathrm{CH} \equiv \mathrm{C}-\underset{\mathrm{CH}_{3}}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_{3} \)
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