1.

Write the products formed when benzaldehde reacts with the following reagents: (i) CH_3CHO is presence of dilute NaOH (ii) (iii) Conc.NaOH (b) Distinguish between the following: (i) CH_3-CH=CH-CO-CH_3 andCH_3-CH_2-CO-CH=CH_2 (ii) Benzaldehyde and Benzoic acid.

Answer»

Solution :(a) (i) `C_6H_5 -overset(OH)overset|CH-CH_2CHO`
(II)
(iii) `C_6H_5CH_2OH and C_6H_5COONa`
Benzyl alcohol Sodium BENZOATE
(b) (i) `CH_3-CH=CH-CO-CH_3` gives a yellow precipitate of `CHI_3` when treated with `I_2` and NaOH solution as it is a methyl ketone.
`CH_3-CH_2-CO-CH=CH_2` does not give the TEST.
(ii) 2,4-DNP test: BENZALDEHYDE gives a yellow ppt. with 2,4-DNP solution.
Benzoic acid does not give the test.


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