Q23 / 180 · KCET 2015 · Chemistry

Number of possible alkynes with formula \( \mathrm{C}_{5} \mathrm{H}_{8} \) is

  • A
    \( 12 \)
  • Correct answer
    B
    \( 13 \)
  • C
    \( 04 \)
  • D
    \( 05 \)

Solution

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) \( \mathrm{CH} \equiv \mathrm{C}-\underset{\mathrm{CH}_{3}}{\mathrm{C}} \mathrm{H}-\mathrm{CH}_{3} \)

Hence, the correct answer is option: 'B'.

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