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Chemistry · 2024 · 3 marks
Haloalkanes and HaloarenesChemical Reactions of Haloalkanes and Haloarenes3 marksUnderstandshort answer
CBSE 2024 · Region 5 · Set 1 · Q26
Account for the following: 1 × 3 (a) Haloalkanes react with AgCN to form isocyanide as main product. (b) Allyl chloride shows high reactivity towards…
Account for the following : $\displaystyle \mathbf{1} \boldsymbol{\times} \mathbf{3}$
(a)
Haloalkanes react with AgCN to form isocyanide as main product.
(b)
Allyl chloride shows high reactivity towards $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ reaction.
(c)
Haloarenes are extremely less reactive towards nucleophilic substitution reactions.
Marking-scheme solution
(a)
AgCN is mainly covalent in nature and only nitrogen is free to donate electron pair forming isocyanide as the main product.
(b)
Allyl carbocation formed isresonance stabilized./
(c)
Due to Resonance, a partial double bond is formedbetween \(\displaystyle \mathrm{C}-\mathrm{X} / \mathrm{sp}^{2}\) hybridization of carbon atom in C-X bond / Instability of phenyl cation.
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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.