CBSE 2026 · Region 4 · Set 1 · Q23 · 3 marks
What happens when :(a)Propanenitrile is treated with phenyl magnesium bromide followed by hydrolysis?(b)p-fluorotoluene is treated with $\displaystyle \mathrm{CrO}_{3}$ in the presence of acetic anhydride followed by hydrolysis with aqueous acid.(c)Phthalic acid is treated with $\displaystyle \mathrm{NH}_{3}$ followed by heating ? Write chemical reactions in support of your answer.[]
What happens when :
(a)
Propanenitrile is treated with phenyl magnesium bromide followed by hydrolysis?
(b)
p-fluorotoluene is treated with $\displaystyle \mathrm{CrO}_{3}$ in the presence of acetic anhydride followed by hydrolysis with aqueous acid.
(c)
Phthalic acid is treated with $\displaystyle \mathrm{NH}_{3}$ followed by heating ? Write chemical reactions in support of your answer.[]
Marking-scheme solution
(a)
$$\mathrm{CH_3-CH_2-C\equiv N} \;+\; \mathrm{C_6H_5MgBr} \;\xrightarrow[\mathrm{H_3O^+}]{\text{ether}}\; \mathrm{C_2H_5-\underset{\underset{\mathrm{C_6H_5}}{|}}{\overset{\overset{\mathrm{O}}{\parallel}}{C}}}$$
(b)
(c)
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic AcidsApplyshort_answerhard
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.