Match the elements of Column I to elements of Column II. There can be single or multiple matches. Column I (a) \(\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}\right)_{2} \mathrm{O}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}\) (c) \(\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}\) Column II (p) Friedel-Crafts reaction (q) Benzoin condensation (r) Perkin reaction (s) Rosenmund's reduction (t) Claisen condensation

Organic compounds from Column I are: (a) Diethyl ether: \(\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}\right)_{2} \mathrm{O}\) (b) Benzoyl chloride: \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}\) (c) Ethyl propanoate: \(\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}\) (d) Benzaldehyde: \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}\)

Before matching the compounds with the appropriate reactions, let's summarize the essential properties of the reactions: (p) Friedel-Crafts reaction: This reaction involves the alkylation or acylation of aromatic compounds using alkyl halides or acyl halides in the presence of a Lewis acid catalyst like AlCl3. (q) Benzoin condensation: This reaction is a coupling reaction between two aldehydes, usually benzaldehyde, in the presence of a nucleophile like a cyanide ion, resulting in an α-hydroxyketone (benzoin). (r) Perkin reaction: This is an organic reaction used to create a cinnamic acid type compound from the reaction of acetic anhydride, an aromatic aldehyde, and an alkali salt of an acid (acetic acid). (s) Rosenmund's reduction: This reaction is used for the reduction of acyl chlorides to aldehyde, using hydrogen gas over Palladium/BaSO4 as a catalyst. (t) Claisen condensation: It is an organic reaction where the ester undergoes nucleophilic acyl substitution with another ester molecule to form a β-keto ester.

(a) Diethyl ether: This compound doesn't fit well with any of the reactions given in Column II. So, no match for this compound. (b) Benzoyl chloride: This compound is an acyl chloride and can participate in the Friedel-Crafts reaction as well as Rosenmund's reduction. So, the matches are (p) and (s). (c) Ethyl propanoate: This compound is an ester and can participate in the Claisen condensation. So, the match is (t). (d) Benzaldehyde: This compound is an aromatic aldehyde, which can participate in the Benzoin condensation as well as Perkin reaction. So, the matches are (q) and (r). In conclusion, the elements of Column I are matched to the elements of Column II as follows: (a) No match (b) (p) Friedel-Crafts reaction, (s) Rosenmund's reduction (c) (t) Claisen condensation (d) (q) Benzoin condensation, (r) Perkin reaction