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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 3 · Q26
(a) Write the IUPAC name of the given compound: CH_3 CH ( CH_3) CH ( Br ) CH_3; 1+1+1 (b) Define Racemisation. (c) The boiling points of the alkyl…
(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.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.