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Chemistry · 2024 · 2 marks
Haloalkanes and HaloarenesChemical Reactions of Haloalkanes and Haloarenes2 marksApplyvery short answer
CBSE 2024 · Region 1 · Set 1 · Q20
(a) Draw the structures of major monohalo products in each of the following reactions: (i)
Draw the structures of major monohalo products in each of the following reactions :
(i)
Give reasons for the following :
(i)
Grignard reagent should be prepared under anhydrous conditions.
(ii)
Alkyl halides give alcohol with aqueous KOH whereas in the presence of alcoholic KOH , alkenes are formed.
Marking-scheme solution
(i)
(ii)
(i)
It reacts with water to form alkane.
(ii)
Alcoholic KOH acts as a stronger base than aqueous KOH leads to elimination reaction of alkyl halide. / alkoxide ions in alcoholic KOH acts as a stronger base due to which elimination reaction takes place.
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CBSE Class 12 Chemistry past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.