CBSE 2026 · Region 2 · Set 3 · Q26 · 3 marks
(a)Write the IUPAC name of the given compound : \[\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_{3} \] \[1+1+1 \](b)Define Racemisation.(c)The boiling points of the alkyl halides with the same alkyl group decrease in the given order : \[\mathrm{RI}>\mathrm{RBr}>\mathrm{RC} l>\mathrm{RF} \] Explain the above statement.
(a)
Write the IUPAC name of the given compound : \[\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_{3} \] \[1+1+1 \]
(b)
Define Racemisation.
(c)
The boiling points of the alkyl halides with the same alkyl group decrease in the given order : \[\mathrm{RI}>\mathrm{RBr}>\mathrm{RC} l>\mathrm{RF} \] Explain the above statement.
Marking-scheme solution
(a)
$\displaystyle 2$-Bromo-$\displaystyle 3$-methylbutane
(b)
The process of conversion of enantiomer into a racemic mixture is known as
racemisation.
(c)
It is because with the decrease in size and mass of halogen atom, the
magnitude of van der Waal forces decreases.
Haloalkanes and HaloarenesNomenclature of Haloalkanes and HaloarenesUnderstandshort_answereasy
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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.