CBSE 2026 · Region 3 · Set 1 · Q17 · 2 marks
For the compound having molecular formula $\displaystyle \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}$, write :(a)the isomer which is most reactive towards $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ displacement.(b)the isomer which, on reacting with Na metal in the presence of dry ether, gives $\displaystyle 2,5$-Dimethylhexane.
For the compound having molecular formula $\displaystyle \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{Br}$, write :
(a)
the isomer which is most reactive towards $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ displacement.
(b)
the isomer which, on reacting with Na metal in the presence of dry ether, gives $\displaystyle 2,5$-Dimethylhexane.
Marking-scheme solution
(a)
(CH3)3CBr
(b)
Haloalkanes and HaloarenesChemical Reactions of Haloalkanes and HaloarenesApplyvery_short_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.