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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 3 · Set 1 · Q26
Give reasons for the following: (a) Although chlorine is an electron-withdrawing group, yet it is ortho-, para-directing in electrophilic aromatic…
Give reasons for the following :
(a)
Although chlorine is an electron-withdrawing group, yet it is ortho-, para-directing in electrophilic aromatic substitution reactions.
(b)
Aryl halides cannot be prepared by reacting phenol with concentrated halogen acids or phosphorus halides.
(c)
Chloroform is stored in closed dark coloured bottles.
Marking-scheme solution
(a)
Because +R effect of chlorine stabilises the intermediate carbocation and
hence activate the benzene ring at ortho and para positions.
(b)
Because the carbon – oxygen bond in phenols has a partial double bond
character and is difficult to break being stronger than single bond.
(c)
Because chloroform in the presence of air and light forms poisonous gas
phosgene.
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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.