Intramolecular Aldol Condensation

Q.

Which alkyl halide from the following pairs would you expect to react more rapidly by an S_N2 mechanism? Explain your answer.

(i)

(ii)

(iii)

Q. Acetaldehyde on warming with Fehling's solution gives a red precipitate of

1. Elemental copper
2. Cuprous oxide
3. Cupric oxide
4. Mixture of all of the above

Q. Acetophenone when reacted with a base, $C_2{H}_{5}ONa$, yeilds a stable compound which has the structure.

1. 
2. 
3. 
4. 

Q. A carbonyl compound P, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intra-molecular aldol reaction to give predominantly S.

The structure of the carbonyl compound P, is

1. 
2. 
3. 
4. 

Q. In which ever cases friedel crafts alkylation/acylation will not work

Q. how many isomeric ha\log en deriivatives including stereoisomers are possible for c2h2br2

Q. Difference between SN1 and SN2 reaction mechanism.

Q.

.Suggest a mechanism for the reaction

)(-)-2-bromaooctane when treated with aqueous NaOH produces (+)-octan-2-ol

Q. What is the final major product of the following sequence of reactions?

1. 
2. 
3. 
4. 

Q. Elimination reactions of the following compound with sodium ethoxide give two alkenes, A and B, but with different selectivities. Which of the following statements best indicates the most probable outcome?

1. A will be the major product
2. B will be the major product
3. A and B will be formed in equal quantities
4. can't be predicted

Q. 55 A reaction of ethyl amine & acetic anhydride leads to the formation of??

Q. In the following reaction,
$\text{Carbonyl compound}+MeOH\stackrel{HCl}{\rightleftharpoons }\text{Acetal}$,
rate of the reaction is the highest for:

1. Acetone as substrate and methanol in stoichiometric amount
2. Acetone as substrate and methanol in excess
3. Propanal as substrate and methanol in excess
4. Propanal as substrate and methanol in stoichiometric amount

Q. 39.What happens on hydrolysis of sodium benzoate

Q. 97 Show the reaction mechanism of:- CH3-CH=CH-CHO+HBr Why does Carbocation formation does not take place beside CHO carbon?

Q.

Hydrolysis of NCl3 gives NH4OH and HOCl while PCl3 on hydrolysis gives H3PO3 and HCl. EXPLAIN.

Q. write the major product of following cross aldol condenstion : formaldehyde and propionaldehyd

Q. 30. in the presence of an acid catalyst, two alcohol molecules will undergo dehydration to give ?

Q. 45. Acetoxime reacts with P2O5 to give (1) Methyl cyanide (2) Methyl cyanate (3) Ethyl cyanide (4) Acetamide

Q.

The structure of the carbonyl compound P, which gives positive iodoform test undergoes reaction with MeMgBr followed by dehydration to give an olefin Q. Ozonolysis of Q leads to a dicarbonyl compound R, which undergoes intramolecular aldol reaction to give predominantly S.


The structure of the carbonyl compound P is:

1. 

2. 
   

3. 

4. 

Q. Why Benzophenone does not give Cannizzaro reaction? Aldol condensation product of 1 -Phenyl propanone

Q. Predict the product(s) of the reaction below.

1. 
2. 
3. 
4. All of the above

Q. Which of the following reaction will not produce $1^o$ amine as major product?

1. $H_{3}C-C{H}_2-C\equiv N\to \left(Completehydrolysis\right)H^{+}/H_{2}O$
2. $H_{3}C-C{H}_2-\stackrel{O}{\stackrel{||}{C}}-OH\underset{H^{+}}{\overset{N_{3}H}{\to }}$
3. $\text{Phthalimide}\underset{ii.C{H}_3-C{H}_2-C{H}_2-I}{\overset{i.KOH}{\to }}\stackrel{O{H}^{-}/H_{2}O}{\to }$
4. $C{H}_3-C{H}_2-Br+N{H}_3\left(excess\right)\to$

Q. The compound that does not undergo cannizaro reaction is:

1. formaldehyde
2. acetaldehyde
3. benzaldehyde
4. trimethyl acetaldehyde

Q. 39. Aldol condensation of Ch3-C(CH3)=CH-C(CH3)=O

Q. Among the following compounds, the one which can undergo aldol condensation is:

1. $(C{H}_3{)}_{2}CHCHO$
2. $HCHO$
3. $C_6{H}_{5}CHO$
4. Both (a) and (b)

Q. In the reaction given below, the major product formed is?

1. 
2. 
3. 
4. 

Q. What is the final major product of the following sequence of reactions?

1. 
2. 
3. 
4. 

Q. Find the B ?

Q. Cannizaro reaction is not given by :

1. trimethyl acetaldehyde
2. acetaldehyde
3. formaldehyde
4. benzaldehyde

Q. Ethanal$\left(C{H}_{3}CHO\right)$ undergoes aldol condensation reaction. Give reason.