1.

Which of the following will give aldchyde only?

Answer»

OZONOLYSIS of alkene
Rosenmund's reaction
Stephen's reaction
Hydration of alkyne.

Solution :(a) Alkene on ozonolysis GIVES a mixture of CARBONYL compound. It is 2-butene which gives acetaldehyde only.
(b) `R-overset(O)overset(||)C-Cl overset(H_(2) // Pd-BaSO_(4))to R-CH=O` (Rosenmund reduction)
(c) `R-C-=N underset(H^(+))overset(SnCl_(2) // HCl)to R-CH=NH underset(H^(+))overset(H_(2)O)to R-CH=O` (Stephen reaction)
Any alkyne except acetylene on hydration gives KETONE not aldehyde.


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