CBSE Class 12 · 2010 · All India · Aldehydes Ketones and Carboxylic AcidsLong Answer

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a) Illustrate the following name reactions, giving a chemical equation in each case:
i) Clemmensen reaction ii) Cannizzaro's reaction
b) Describe how the following conversions can be brought about:
i) cyclohexanol to cyclohexan-1-one ii) ethylbenzene to benzoic acid iii) bromobenzene to benzoic acid

Solution

(a)(i)

C_{6} H_{5} COC H_{3} Zn (Hg) /HCl C_{6} H_{5} C_{2} H_{5}

(ii)

2HCHO conc.NaOH C H_{3} OH + HCOONa

(b)(i)

C_{6} H_{11} OH Cr O_{3} cyclohexan - 1 - one

(ii)

C_{6} H_{5} C_{2} H_{5} KMn O_{4} /O H^{-}, Δ H^{+} C_{6} H_{5} COOH

(iii) Grignard carbonation:

C_{6} H_{5} Br Mg/ether C_{6} H_{5} MgBr C O_{2} H_{3} O^{+} C_{6} H_{5} COOH

CBSE Class 12 Board · 2010 · All India · Subjective

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