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Question : 36
Total: 37
(a) Write the products formed when benzaldehyde reacts with the following reagents :
(i)CH 3 CHO in presence of dilute NaOH
(iii)Conc.NaOH
(b) Distinguish between following:
(i)CH 3 − CH = CH − CO − CH 3 and CH 3 − CH 2 − CO − CH = CH 2
(ii) Benzaldehyde andBenzoic acid
OR
(a) Write the final products in the following:
CH 2 = CH − CH 2 − CN
(b) Arrange the following in the increasing order of their reactivitytowards nucleophilic addition reaction:
(i)
(iii)Conc.
(b) Distinguish between following:
(i)
(ii) Benzaldehyde andBenzoic acid
OR
(a) Write the final products in the following:
(iii)
(b) Arrange the following in the increasing order of their reactivitytowards nucleophilic addition reaction:
(c) Draw the structure of 2, 4 DNP derivative of acetaldehyde.
Solution:
(a) CH 3 − CH = CH − CO − CH 3 gives iodoform test while CH 3 − CH 2 − CO − CH = CH 2 does not give.
CH 3 − CH = CH −
− CH 3 + 3 NaOI →
+ 2 NaOH + CH 3 − CH = CHCOONa
CH 3 CHCOCH = CH 2 + 3 NaOI → No ppt
(ii) ● Benzaldehyde reacts with tollen's reagent to form silver mirror. Benzoic acid does not give this reaction.
● WithNaHCO 3 benzaldehyde does not react while benzoic acid produces brisk effervescences.
OR
(a)
(iii)CH 2 = CH − CH 2 − CN
CH 2 = CH − CH 2 −
− H
(b) (i)
(ii) ● Benzaldehyde reacts with tollen's reagent to form silver mirror. Benzoic acid does not give this reaction.
● With
OR
(a)
(iii)
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