12th Class Chemistry Aldehydes, Ketones and Carboxylic Acids / ऐल्डिहाइड, कीटोन तथा कर्बोक्सिलिक अम्ल

  • question_answer 14)
    Predict the products formed when cyclohexane carbaldehyde reacts with following reagents. (i)  and then (ii) Tollen's reagent (iii) Semicarbazide and weak acid (iv) Excess ethanel and acid (v) Zinc amalgam and dilute hydrofluoric acid (i) Nucleophilic addition of RMgBr (Grignard reagent) to  group. Following by hydration. Carbinol is formed. (ii) Oxidation of ?CHO group to ?COOH and reduction of to Ag(silver), i.e., silver mirror is formed. (iii) Removal of from  and  group so semicarbazone is formed. (iv) Nucleophilic addition followed by substitution; Acetal is formed. (v) Conversion of ?CHO group to  i.e., Cycloalkane is formed (Clemmnesen?s reduction).  

    Answer:

    (i) (ii)     (iii)                 (iv) (v)  


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