MCQ
Correct $IUPAC$ name
  • A
    $1-$ methyl $-3-$ ethykyclohexene
  • $5-$ ethyl $-1 -$ methylcyclohexene
  • C
    $2- $ ethyl $-4-$ methylcyclohexene
  • D
    $3-$ ethyl $-1-$ methylcyclohexene

Answer

Correct option: B.
$5-$ ethyl $-1 -$ methylcyclohexene
b
here, numbering is done in such a way that double bond gets first priority along  wih lowest number to the locants.
$\therefore$ There are $2$ substituents ethyl and methyl.
$IUPAC$ name $: 5-$ ethyl $-1-$ methyl cyclohexene

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