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Aldehydes and Ketones - 4
1.
When formaldehyde is treated with 50% solution of NaOH, at room temp
a) CH
3
OH is formed
b) CH
3
OH and HCOONa are formed
c) HCOOH is formed
d) HCOONa is formed
2.
Which of the following reagents will react with both aldhyde and ketones
a) Fehlings reagent
b) Tollens reagent
c) Benedicts reagent
d) Grignard reagent
3.
When acetone is treated with Ba(OH)
2
the product is
a) Acetic acid
b) Ethyl alcohol
c) Acetaldehyde
d) 4-Hydroxy-4-methyl-2-pentanone
4.
(CH
3
)
2
C=O + NaHSO
3
®
A A + HCl
®
B + C the identities of A,B & C are
a) (CH
3
)
2
C(OH) SO
3
Na, CH
3
CHO, SO
2
b) (CH
3
)
2
CHSO
3
Na, CH
3
CHO, SO
2
c) (CH
3
)
2
C(OH)SO
3
Na, CH
3
CH
2
OH, SO
2
d) (CH
3
)
2
CHOH, CH
3
CHO, SO
2
5.
Which of the following reaction is used for the identification of aldehydes & ketones
a) By polymerizing them with dil H
2
SO
4
b) By reaction with Benedicts solution
c) By treating them with NaBH
4
d) By reaction with 2,4 dinitrophenyl hydrazine
6.
To protect aldehyde group against alkaline oxidizing agent.
a) It is oxidized
b) An acetal is formed
c) It is treated with NaBH
4
d) It is catalytically reduced
7.
C
6
H
5
CHO
a) Aldol condensation
b) Iodoform test
c) Cannizzaros reaction
d) Acetal
8.
CH
3
CH (OC
2
H
5
)
2
a) Acetal
b) Resistant to oxidation
c) Iodoform test
d) Cannizzaros reaction
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