What is the order of ease of dehydrohalogenation of alkyl halides?
What is the order of ease of dehydrohalogenation of alkyl halides?
$3^{\circ}\gt2^{\circ}\gt1^{\circ}$
$2^{\circ}\gt1^{\circ}\gt3^{\circ}$
$3^{\circ}\gt1^{\circ}\gt2^{\circ}$
$1^{\circ}\gt2^{\circ}\gt3^{\circ}$
Solution
According to Saytzeff elimination, the ease of dehydrohalogenation depends on the stability of the alkyl substituted alkenes which is given as,
$\mathrm{R}_2 \mathrm{C}=\mathrm{CR}_2 \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CHR} \gt \mathrm{R}_2 \mathrm{C}=\mathrm{CH}_2, \mathrm{RCH}=\mathrm{CHR} \gt \mathrm{RCH}=\mathrm{CH}_2$
$\therefore \quad$ The ease of $\alpha, \beta$-dehydrohalogenation is:
$3^{\circ} \gt 2^{\circ} \gt 1^{\circ}$