Write down the reactions and name the products obtained from the reaction of benzoic acid with the following
reactants:
e) H2 and Ni cat. at 200 ° C and 200 atm;
Answers
Answer:
same as
Explanation:
(a) :
(i) Ref. image
(ii) 2C
6
H
5
CHO+conc.NaOH⟶C
6
H
5
CH
2
OH+C
6
H
5
COONa
(iii) CH
3
COOH
Cl
2
/P
Cl
∣
C
H
2
−COOH
(b) :
(i) Benzaldehyde and Benzoic acid
Test -1: Through sodium bicarbonate
Benzaldehyde does not react with sodium bicarbonate. However, benzoic acid will produce brisk effervescence on reaction with sodium bicarbonate as shown in the given reaction:
C
6
H
5
COOH+NaHCO
3
⟶C
6
H
5
COONa+H
2
O−CO
2
Test -2: Through Tollen's reagent
Benzaldehyde reacts with an ammoniacal solution of sliver nitrate to form a silver mirror.
C
6
H
5
CHO+2[Ag(NH
3
)
2
]
+
3OH
−
⟶C
6
H
5
COO
−
+2Ag+2H
2
O+4NH
3
However, no such reaction is given by benzoic acid.
(ii) Test - 1: Iodoform Test
Propanone gives positive iodoform test, as it contains CH
3
CO group, whereas propanal does not give iodoform test. The reaction is as follows:
propanone
CH
3
COCH
3
+3I
2
+4NaOH
iodoform (yellow)
CH
3
+3NaI+CH
3
COONa+3H
2
O
Propanal
CH
6
CH
2
CHO
+3I
2
+4NaOH→4NaOH→No reaction