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Chemistry · 2025 · 2 marks
Haloalkanes and HaloarenesChemical Reactions of Haloalkanes and Haloarenes2 marksUnderstandvery short answer
CBSE 2025 · Region 2 · Set 1 · Q21
(a) In the following pair of halogen compounds, which compound undergoes S_N 1 reaction faster and why? (b) Arrange the following compounds in…
(a)
In the following pair of halogen compounds, which compound undergoes $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ reaction faster and why ? 
(b) Arrange the following compounds in increasing order of their reactivity towards $\displaystyle \mathrm{S}_{\mathrm{N}} 2$ displacement : $\displaystyle 2$-Bromo-$\displaystyle 2$-methylbutane, $\displaystyle 1$-Bromopentane, $\displaystyle 2$-Bromopentane.
(b) Arrange the following compounds in increasing order of their reactivity towards $\displaystyle \mathrm{S}_{\mathrm{N}} 2$ displacement : $\displaystyle 2$-Bromo-$\displaystyle 2$-methylbutane, $\displaystyle 1$-Bromopentane, $\displaystyle 2$-Bromopentane.Marking-scheme solution
(a)
, due to the formation of more stable tertiary carbocation.
(b)
$\displaystyle 2$-Bromo-$\displaystyle 2$-methylbutane < $\displaystyle 2$-Bromopentane < $\displaystyle 1$-Bromopentane.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.