1.

Hydration of alkynes catalysed by H_2 SO_4 in presence of Hg^(+2) give carbonyl compounds. Which of the following is correct.

Answer»

Acetylene gives acetaldehyde
Terminal alkynes (R-C`-=`CH) GIVE aldehydes
Non-terminal alkynes give ketones
All the above

Solution :`(A) `Acetylene givesacetaldehyde`HC -= CHunderset(HG^(+))overset(H_2 SO_4) to [H_2 C= CH -OH] toCH_3 -CHO`
`(C ) ` Terminalalkynes`R-C-= CH underset(H_2SO_4) overset(Hg^(+2))to[R -underset(OH) underset(|)C=CH_2] to R- underset(O) underset(||)C-CH_3`
(D) Non-terminalalkynesgive ketons
`R-C-=C -Runderset(H_2SO_4)overset(Hg^(+2))to[R-CH= underset(OH) underset(|)C-R ] toR- CH_2 - underset(O) underset(||)C-R ` ( ketones)


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