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    <pre style="white-space:pre-line"><code>12, Aldehydes and Ketones                                         eLearn.Punjab

Q. 12 What types of aldehydes give Cannizzaroâ€™s reaction? Give its mechanism.

Q. 13 Explain the mechanism of the reaction of phenylhydrazine with acetone.
Q. 14 Using ethyne as a starting material how would you get acetaldehyde,

       acetone and ethyl alcohol?

Q. 15 Give the mechanism of addition of HCN to acetone.

Q. 16 How would you bring about the following conversions?

(i) Acetone into t-butyl alcohol                        (ii) Propanal into 1-propanol

(iii) Propanone into 2-propanol                         (iv) Methanal into ethanal

(v) Ethanal into propanone                              (vi) Ethanal into 2-propanol

(vii) Ethyne into ethanal                               (viii) Ethene into ethanal

(ix) Ethanal into ethanol                               (x) Ethanol into 2-butanone

(xi) Methanol into ethanal                              (xii) Ethanol into ethanoic acid .

Q. 17 How will you distinguish between:            (ii) Ethanal and propanone
(i) Methanal and ethanal                            (iv) Acetone and ethyl alcohol
(iii) Ethanal and propanal               (vi) Acetaldehyde and benzaldehyde
(v) Butanone and 3-pentanone
(vii) 2-Pentanone and 3-pentanone

Q. 18 Discuss oxidation of (a) aldehydes (b) ketones with:

(i) K2Cr2O7/H2SO4                 (ii)Tollenâ€™s reagent      (iii) Fehlingâ€™s solution

Q. 19 Discuss reduction of (a) aldehydes (b) ketones with

(i) NaBH4/H2O                            (ii) H2/Pd

Q. 20 Give three uses for each of formaldehyde and acetaldehyde.

                                  33</code></pre>
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