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NCERT Class XII Chemistry
Chapter - Aldehydes, Ketones and Carboxylic Acids
Questions with Solutions

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Question : 8
Total: 28
How will you convert ethanal into the following compounds?
(i) Butane-1,3-diol (ii) But-2-enal (iii) But-2-enoic acid
Solution:  
(i)
2CH3CHO
Ethanal
Dil.NaOH
––––––––▶
Aldol‌condensation
4
C
H3
3
C
HOH
2
C
H2
1
C
HO
3−Hydroxybutanal
NaBH4
––––––––▶
(Reduction)
4
C
H3OH−
3
C
HOH−
2
C
H2
1
C
H2OH
Butane−1,3−diol
(ii)
2CH3CHO
Ethanal
(i)‌dil.NaOH
––––––––▶
(ii)H+,Δ
CH3CH=CHCHO
But−2−enal
2CH3CHO
aq.NaOH
––––––––▶
Δ
CH3CH=CHCHO
[Ag(NH3)]+OH+
––––––––▶
Tollens′‌reagent
CH3CH=CHCO2H
But−2−enoic‌acid
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