Question

meaning of cyanonydrin...... (ii) Acetal (iii) semicurbazone......... ​

Answer 1

meaning of cyanonydrin..

Definition of cyanohydrin

: any of various compounds containing both cyano and hydroxyl groups

First Known Use of cyanohydrin

1925, in the meaning defined above

History and Etymology for cyanohydrin

International Scientific Vocabulary, from cyan- + hydr- + -IN entry 1

Answer 2

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(i) Cyanohydrin :

-OH group and cyano group are present on same carbon atom. Addition of HCN to carbonyl group in weakly acidic medium forms cyanohydrin.

(ii) Acetal :

Terminal C atom has two alkoxy groups. Two equivalents of monohydric alcohol add to 1 equivalent of aldehyde in presence of dry HCl gas.

(iii) Semicarbazone :

Derivative of aldehyde or ketone obtained on treatment with semicarbazide in weakly acidic medium.