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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 1 · Q26
(a) Write the major product in the following reactions: 1 + 1 + 1 (b) Define Racemic mixture. (c) p-dichlorobenzene has a higher melting point as…
(a)
Write the major product in the following reactions : $\displaystyle \mathbf{1}+\mathbf{1}+\mathbf{1}$
(b)
Define Racemic mixture.
(c)
p-dichlorobenzene has a higher melting point as compared to its ortho and meta isomers. Why ?
Marking-scheme solution
(a)
(b)
A mixture containing two enantiomers in equal proportions having zero optical
rotation / equimolar mixture of d and l form.
(c)
It is due to symmetry of para isomer that fits into crystal lattice better as
compared to ortho and meta isomers.
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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.