Q4 / 150 · MHT CET 2024 (15 May Shift 2) · Chemistry

The correct stability order of alkyl substituted alkenes is

  • A
    $\mathrm{R}_2 \mathrm{C}=\mathrm{CHR} \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2$
  • Correct answer
    B
    $\mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CHR} \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2$
  • C
    $\mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CHR}$
  • D
    $\mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CHR}$

Solution

Order of stability of alkyl substituted alkenes: $\mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CHR} \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2$
Greater is the number of alkyl groups attached to the doubly bonded carbon atoms, greater is the stability of alkene.

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

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