A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of -hydroxy acid. The carbonyl compound is
1. acetaldehyde
2. acetone
3. diethyl ketone
4. formaldehyde
A and B in the following reactions are A
1. A=, B=NaOH
2. A=, B=
3. A=, B=
4. A=, B=
An ester is boiled with KOH. The product is cooled and acidified with conc. HCl. A white crystalline acid separates. The ester is
1. methyl acetate
2. ethyl acetate
3. ethyl formate
4. ethyl benzoate
The compound formed when malonic acid heated with urea, is
1. cinnamic acid
2. butyric acid
3. barbituric acid
4. crotonic acid
Formaldehyde can be distinguished from acetaldehyde by:
1. Fehling's solution
2. Schiff's reagent
3. Ammonia
4. Ammoniacal
Aldol condensation will not take place in [1999]
1. HCHO
2. CH3CHO
3. CH3COCH3
4. CH3CH2CHO
Dry distillation of barium salt of Hexane-1,6-dicarboxylic acid gives:
1.
2.
3.
4.
Nucleophilic addition reaction will be most favoured in [2006]
1.
2.
3.
4.
Ethyl acetate on reaction with excess of methyl magnesium chloride and dil. H2SO4 gives
1. dimethyl ketone
2. iso propyl alcohol
3. ethyl aceto acetate
4. t-butyl alcohol
A mixture of benzaldehyde and formaldehyde on heating with aqueous (conc.)NaOH solution gives
1. benzyl alcohol and sodium formate
2. sodium benzoate and methyl alcohol
3. sodium benzoate and sodium formate
4. none of these
The compound Y in the above sequence of reactions is:
1. 1-Phenylethene
2. 2-Phenyl-2-propanol
3. Acetophenone
4. Benzaldehyde
The compound A can be exclusively oxidized into B by:
1. NaCN, followed by hydrolysis
2. NaOI, followed by H3O+
3. KMnO4(hot), followed by hydrolysis
4. K2Cr2O7, followed by H3O+
A B;B is
(1)
(2)
(3)
(4)
Consider the following reaction,
Product
Product is?
1. | 2. | ||
3. | 4. |
Which of the following acid is most easily decarboxylate :-
1.
2.
3.
4.
For the following reactions sequence
The structure consistent with X and Y are:
'Y' | 'X' | |
(1) | ||
(2) | ||
(3) | ||
(4) |
The product is :
(1) | |
(2) | |
(3) | |
(4) | None |
The product R is :
(1) | |
(2) | |
(3) | |
(4) |
The product 'C' is
(1) | |
(2) | |
(3) | |
(4) |
The product B is
(1) PhCH = CHCH2Br
(2)
(3) PhCH2CH(Br)COOH
(4) PhCH = CH − Cobr
W is
(1) | CH2 = CH − CH = CH2 |
(2) | CH3 − CH = CH − CH = CH2 |
(3) | |
(4) | CH3 − CH = CH − CH = CH − CH3 |
PhCOOH, PhMe can be separated by
(1) KMnO4
(2) aq. NaHCO3 + n–hexane
(3) H2O
(4) All of these
(1) CH3CH(OH)2, CH3CH(OH)COOH
(2) CH3CHO, CH3CH(OH)COOH
(3) CH3CH2COOH, CH3CH2OH
(4) CH3CH(OH)COOH, CH3CH2OH
Which statement is correct about the following reaction
(1) There is inversion of configuration at asymmetric C* atom
(2) There is No change of configuration at asymmetric C* atom
(3) There is 100% racemisation at C* atom
(4) % inversion > % retention at C* atom
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