Aldehydes and ketones will not form crystalline derivatives with
1. sodium bisulphite
2. phenyl hydrazine
3. semicarbazide hydrochloride
4. dihydrogen sodium phosphate
Acetone reacts with iodine to form iodoform in the presence of
1. Ca
2. NaOH
3. KH
4. Mg
Two isomeric ketones 3-Pentanones and 2-pentanone can be distinguished by
1. I2/NaOH only
2. NaHSO3 only
3. NaCN/HCl
4. both of (a) and (b)
Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore, X and Y are respectively
1. Sodalime and copper
2. Zn dust and NaOH
3. Cu and sodalime
4. Sodalime and zinc dust
The product formed in aldol condensation is
1. a beta-hydroxy acid
2. a beta-hydroxy aldehyde or a beta-hydroxy ketone
3. an alpha-hydroxy aldehyde or ketone
4. an alpha, beta unsaturated ester
Which one of the following can be oxidised to the corresponding carbonyl compound?
1. 2-hydroxy propane
2. Ortho-nitro phenol
3. Phenol
4. 2-methyl-2-hydroxy propane
Consider the following reaction,
PhenolXYZ
The product Z is
1. toluene
2. benzaldehyde
3. benzoic acid
4. benzene
Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called
1. Clemmenson reduction
2. Cope reduction
3. Dow reduction
4. Wolff-Kishner reduction
The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using
1. phosphorus pentachloride
2. hypochlorous acid
3. chlorine
4. hydrochloric acid
Acetone reacts with iodine (I2) to form iodoform in the presence of
1. CaCO3
2. NaOH
3. KOH
4. MgCO3
A and B in the following reactions are
1. A=RR'CH2CN, B=NaOH
2. A=RR'C , B=CH3
3. A=RR'C , B=CH3
4. A=RR"C, B=LiAlH4
Benzaldehyde and acetaldehyde can be distinguished by:
1. iodoform test
2. 2,4 - DNP test
3. reaction
4. Wolff-Kishner's reduction
Acetaldehyde normally reacts with
1. only electrophiles
2. only nucleophiles
3. only free radicals
4. both electrophiles and nucleophiles
Nucleophilic addition reaction will be most favoured in [2006]
1.
2.
3.
4.
The enolic form of acetone contains:
1. 9 -bonds, 1-bond and 2 lone pairs
2. 8 -bonds, 2-bonds and 2 lone pairs
3. 10 -bonds, 1-bond and 1 lone pair
4. 9 -bonds, 2-bonds and 1 lone pair
In this reaction,
CH3CHO + HCN CH3CH(OH)CN CH3CH(OH)COOH
an asymmetric compound is generated. The acid obtained would be
1. 50% D + 50% L-isomer
2. 20% D + 80% L-isomer
3. D-isomer
4. L-isomer
Cyanohydrin of which compound gives lactic acid on hydrolysis?
1. Acetone
2. Acetaldehyde
3. Propanal
4. HCHO
Formaldehyde can be distinguished from acetaldehyde by:
1. Fehling's solution
2. Schiff's reagent
3. Ammonia
4. Ammoniacal
The reaction
is fastest when X is
1. Cl
2. NH2
3. OC2H5
4. OCOR
In a set of reaction propionic acid yielded a compound D.
CH3CH2COOH B C
The structure of D would be
1. CH3CH2NHCH3
2. CH3CH2NH2
3. CH3CH2CH2NH2
4. CH3CH2CONH2
Product, Product is
1. 2.
3. 4.
Which of the following gives aldol condensation
(1)
(2)
(3)
(4)
R-Cl A
R-Cl is
(1)
(2)
(3)
(4)
A B;B is
(1)
(2)
(3)
(4)
Consider the following reaction,
Product
Product is?
1. | 2. | ||
3. | 4. |
Identify the product (c) in the series
CH3CNABC
1. CH3COOH
2. CH3CH2NHOH
3. CH3CONH2
4. CH3CHO
Product (B) of the reaction is :
1.
2.
3.
4.
Product (A) of the reaction is :
1.
2.
3.
4.
(A) and (B) is differentiated by :
1. NaH
2. 2-4 DNP
3. Tollen's reagent
4.
Which -keto acid shown will not undergo decarboxylation ?
(1)
(2)
(3)
(4)
(A) , Product (A) obtained is :
(1)
(2)
(3)
(4)
+ (A)
(71%)
In above reaction identify major product (A) of the reaction:
(a) (b)
(c) (d)
A key step in the hydrolysis of acetamide in aqueous acid proceeds by nucleophilic addition of :
(1) to
(2) to
(3) to
(4) to
Which is the major product of the following reaction?
1.
2.
3.
4.
Compound having molecular formula may be:
(1) cyclic ether
(2) carbonyl compound
(3) unsaturatd ether or unsaturatd alcohol
(4) all of the above
Which of the following would undergo aldol condensation?
(1) CHO
(2)
(3) CHO
(4) HCHO
Both acetaldehyde and ketone react with:
(1) ammoniacal AgNO3
(2) rochelle salt
(3) 2,4-dinitro phenylhydrazine
(4) all of the above
Which structural unit is possessed by aldehyde and not ketone?
(1) -H-atom
(2) H-atom and carbonyl group
(3) OH and carbonyl group
(4) None of the above
Ketones are less reactive than aldehydes because:
(1) C=O group is more polar in ketones
(2) of electromeric effect
(3) of steric hindrance to the attacking reagent
(4) none of the above
The important step in Cannizzaro's reaction is the intermolecular shift of:
(1) proton
(2) H-atom
(3) hydride ion
(4) hydronium ion
Pinacole is:
1. 2,3-dimethyl-2,3-butandiol
2. 3,3-dimethyl-2-propanone
3. 3-methylbutan-2-ol
4. None of the above
Benedict's solution provides:
(1) Ag+
(2) Cu2+
(3) Ba2+
(4) Li+
Acetaldehyde undergoes self condensation in presence of aluminium ethoxide to give ethyl acetate. This reaction is called:
(1) Perkin reaction
(2) Tischenko's reaction
(3) Cannizzaro's reaction
(4) Aldol condensation
Semicarbazide is:
(1) NH2CONH2
(2) NH2-NH2
(3) NH2CONHNH2
(4) None of these