(a) Write the product(s) in the following reactions :
(i)

(ii)

(ii)
CH_{3}-CH= CH-CN\; \xrightarrow[(b)H_{2}O]{(a)DIBAL-H}?
(b) Give simple chemical tests to distinguish between the following
pairs of compounds :
(i) Butanal and Butan-2-one
(ii) Benzoic acid and Phenol

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) (i)
  
(ii)
 
(iii) CH_{3}CH= CHCN \: \xrightarrow[(b)H_{2}O]{(a)DIBAL-H}CH_{3}= CHCHO


(b) (i) Butanal and Butan-2-one
Butan-2-one on heating with NaOH and I2 gives yellow precipitate of iodoform but Butanal does not gives this test
CH_{3}COCH_{2}+NaOH+I_{2} \: \xrightarrow{\Delta }CHI_{3}+ CH_{3}CH_{2}COONa
                                                                      yellow
(ii) Benzoic acid and phenol
 Benzoic acid gives effervesence of co2 on reaction with NaHCO3 but phenol doesnot gives this test.

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