Cross Aldol Condensation

Q.

Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither ? Write the structures of the expected products of aldol condensation or Cannizzaro reaction ?

Methanal

2-methyl pentanal

Benzaldehyde

Benzophenone

Cyclohexanone

l - phenyl propanone

Phenyl acetaldehyde

Butan - 1 - ol

2, 2 - dimethyl butanal

Q. Propionic acid with $B{r}_2|P$ yields a dibromo product. Its structure would be:

1. 
2. 
3. 
4. 

Q. $$Ph-C\equiv C-C{H}_3\stackrel{H{g}^{2+}/H^{+}}{\to }?$$
The major product of the above reaction is :

1. 
   
2. 
3. 
4. 

Q.

How will you bring about the following conversion in not more than two steps?
Propanone to propene

Benzoic acid to benzaldehyde

Ethanol to 3-hydroxy butanal

Benzene to m-ntroacetophenone

Benzaldehyde to benzophenone

Bromobenzene to l-phenylethanol

Benzaldehyde to 3-phenyl propan-1-ol

Benzaldehyde to $\alpha$-hydroxy phenyl acetic acid

Benzoic acid to m-nitrobenzyl alcohol

Q.

Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile ?

Q. An alcohol A, when heated with concentrated $H_{2}S{O}_4$ gives an alkene B. When B is bubbled through bromine water and the product obtained is dehydrohalogenated with excess of sodamide, a new compound C is obtained. The compound C gives D when treated with warm dilute $H_{2}S{O}_4$ in presence of $HgS{O}_4$. D can also be obtained either by oxidising A with $KMn{O}_4$ or from acetic acid through its calcium salt. Identify D.

1. A = Ethylene, B = Ethyl alcohol,
   C = Acetylene, D = Acetaldehyde
2. A = Ethyl alcohol, B = Ethylene,
   C = Acetylene, D = Acetaldehyde
3. A = Ethylene, B = Ethyl alcohol,
   C = Acetaldehyde, D = Acetylene
4. A = Propan-2-ol, B = Propene,
   C = Propyne, D = Acetone

Q.

What is the difference between Clemmensen reduction and Wolff Kishner reduction?

Q. The number of stereoisomers obtained by bromination of $trans-2-butene$ is:

Q.

Which of the following does not undergo Aldol condensation?

1. Propanal

2. Propanone

3. Methanal

4. Ethanal

Q. Acetone is obtained by the hydrolysis of the addition product of methyl magnesium iodide and :- (1) HCHO (2) CH3CHO (3) Acetone (4) Ethanenitrile

Q. In a set of reaction acetic acid yields a product [D]. The structure of [D] would be:
$C{H}_{3}C{H}_{2}COOH\stackrel{SOC{l}_2}{\to }A\underset{Anhy.AlC{l}_3}{\stackrel{C_6{H}_6}{}}B\stackrel{HCN}{\to }C\stackrel{HOH}{\to }D$

1. 
2. 
3. 
4. 

Q. Which of the following can give haloform test?

1. Ethyl alcohol
2. Acetaldehyde
3. Acetone
4. All of the above.

Q. The total number of alkyl bromides (including stereoisomers) formed in the reaction $M{e}_3-C-CH=C{H}_2+HBr\to$ will be

1. 1
2. No bromide forms
3. 3
4. 2

Q. What is the difference between aldol condensation, cross aldol condensation and canizzaro reaction

Q.

Which of the following does not undergo Aldol condensation?

1. Propionaldehyde

2. Acetone

3. Formaldehyde

4. Acetaldehyde

Q. Product attained on reaction with sodium ethoxide and tert butylchloride:

1. 
2. 
3. 
4. None of the above

Q. How many monochloro products are possible theoretically when n-hexane is treated with $C{l}_2$ in sunlight?

Q. Ethylcyanide on reaction with sodium and $C_2{H}_{5}OH$ forms :

1. propylamine
2. ethylamine
3. methylamine
4. None of the above

Q. What product would be formed from a $S_{N}2$ reaction between (R)-2-bromobutane and hydroxide ions?

1. 2-butanol
2. (R)-3-hexanol
3. 3-pentanol
4. (S)-2-butanol

Q.

What is the Kolbe Schmitt Reaction?

Q.

Rosenmund's reduction of an acyl chloride gives:

1. an ester

2. hydrocarbon

3. an aldehyde

4. an alcohol

Q. Sodium phenate reacts with acetyl chloride to form a) methyl benzoate b) acetyl phenol c) phenyl acetate d)chlorobenzene

Q. If formaldehyde and conc. KOH are heated, which of the following compounds is obtained?

1. Acetylene
2. Methane
3. Methyl alcohol
4. Ethyl formate

Q. What is the difference between all the possible aldol products formed by ethanal and propanal with dilute NaOH and their corresponding dehydrated $\alpha ,\beta$ unsaturated aldehydes?

Q. The product of acid catalysed hydration of $\text{2-phenyl propene}$ is:

1. $\text{3-phenyl-2-propanol}$
2. $\text{1-phenyl-2-propanol}$
3. $\text{2-phenyl-2-propanol}$
4. $\text{2-phenyl-1-propanol}$

Q. Hell-Volhard-Zelinsky reaction involves the replacement of an .......... atom from from the alkyl group of a monocarboxylic acid by a ...... atom.

1. $\alpha -$halogen, hydroxy group
2. $\alpha -$Hydrogen, hydroxy group
3. $\alpha -$Hydrogen, Halogen
4. None of these

Q. In a set of reactions, acetic acid yielded a product D.
$C{H}_{3}COOH\stackrel{SOC{l}_2}{\to }A\underset{anhydAlC{l}_2}{\stackrel{benzene}{\to }}B\stackrel{HCN}{\to }C\stackrel{H_2{O}^{+}}{\to }D$
The structure of D would be:

1. 
2. 
3. 
4. 

Q. Which of the given aldehydes will not give aldol condensation reactions?

1. 1 and 4 only
2. 1 and 2 only
3. 2, 3 and 4 only
4. 3, 4 and 5 only

Q.

Phenol on treatment with bromine water gives:

1. 2, 4, 6 Tribromo phenol

2. 2, 4 Dibromo phenol

3. 3-Bromo phenol

4. 2-Bromo phenol

Q. Aliphatic ethers are purified by shaking with a solution of ferrous salt to remove _________ which are formed on prolonged standing in contact with water.

1. peroxides
2. aliphatic alcohols
3. aromatic ethers
4. aldehydes