(a) Write the products formed when benzaldehyde reacts with the following reagents :

(i) CH_{3}CHO in presence of dilute NaOH

(ii) H_{2}N-NH

(iii) Conc. NaOH

(b) Distinguish between following :

(i) CH_{3}-CH=CH-CO-CH_{3}  and CH_{3}-CH_{2}-CO-CH=CH_{2}

(ii) Benzaldehyde and Benzoic acid.

 

 
 
 
 
 

Answers (1)

(a) Write the products formed when benzaldehyde reacts with the following reagents :

(i) when benzaldehyde reacts with CH_{3}CHO in presence of dilute NaOH , it forms 3-hydroxy-3-phenylpropanal

(ii) Phenyl hydrazone of benzaldehyde

(iii) Sodium benzoate and benzyl alcohol

(b) 

(i) On heating with NaOH and I2 : CH_{3}-CH=CH-CO-CH_{3}  will form yellow ppt of CHI3 while other compound doesn’t

(ii) On adding NaHCO3 : Benzoic acid produces brisk effervescence while other compound doesn’t

 

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