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8.1. Organic chemistry Nomenclature of organic compounds — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry8.1. Organic chemistry Nomenclature of organic compounds1 Mark
MCQ
The correct $IUPAC$ name of${H_2}C = CH - \mathop {\mathop {CH\,}\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{C{H_3}} - C{H_2}C \equiv CH$
  • ✓
    $3-$ methyl $-1-$ hexen $-5-$ yne
  • B
    $ 4- $ methyl $-5-$ hexen $- 1-$ yne
  • C
    $4-($ethenyl$)-1-$ pentyne
  • D
    $3-(2-$ propenyl$) $butene- $1$
✓

Answer

Correct option: A.
$3-$ methyl $-1-$ hexen $-5-$ yne
a
In the given compound the parent chair consist of $6$-carbon atoms with one double $f$ ane triple bond.

In a double and triple bond, when both of them are at a similar position, then the priority is given to double bond over the triple bond.

Thus, the numbering will be done from thatend from where double bond come first.

Thus, IUPAC name of the combound is $3$-methyl-$1$-hexen-$5$-yne

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