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Formation of Hemiacetals

Draw structur...

Question

Draw structures of the following derivatives

The 2,4- dinitro phenyl hydrazone of benzaldehyde

Cyclopropanone oxime

Acetaldehyde dimethyl acetal

The semicarbazone of cyclobutanone

They ethylene ketal of hexan-3-one

The methyl hemiacetal of formaldehyde

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Q. Draw structures of the following derivatives.
(i) The 2,4-dinitrophenylhydrazone of benzaldehyde
(ii) Cyclopropanone oxime
(iii) Acetaldehydedimethylacetal
(iv) The semicarbazone of cyclobutanone
(v) The ethylene ketal of hexan-3-one
(vi) The methyl hemiacetal of formaldehyde

Q. What is meant by the following terms ? Give an example of the reaction in each case.
(i) Cyanohydrin (ii) Acetal (iii) Semicarbazone
(iv) Aldol (v) Hemiacetal (vi) Oxime
(vii) Ketal (vii) Imine (ix) 2,4-DNP-derivative
(x) Schiffs base

Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither ? Write the structures of the expected products of aldol condensation or Cannizzaro reaction ?

Methanal

2-methyl pentanal

Benzaldehyde

Benzophenone

Cyclohexanone

l - phenyl propanone

Phenyl acetaldehyde

Butan - 1 - ol

2, 2 - dimethyl butanal

Draw the structures of the following compounds.

3 - methyl butanal

p-nitro propiophenone

p- methyl benzaldehyde

4-methyl pent -3-en-one

4-chloro pentan-2-one

3-bromo-4-phenyl pentanoic acid

p, p' - dihydroxyl benzophenone

Hex-2-en-4-ynoic acid

Q. Draw the structure of Acetaldehyde dimethyl acetal.

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Formation of Hemiacetals

Standard XII Chemistry

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