Wittig Ylid

Q. An enzyme contains 11.2%Fe by mass. The number of Fe atoms present in 1g of enzyme is

Q. An alkyl bromide produces a single alkene when it reacts with sodium ethoxide and ethanol. This alkene undergoes hydrogenation and produces 2–methyl butane. What is the identify of the alkyl bromide

1. 1–bromobutane
2. 2–bromo–2–methylbutane
3. 1–bromo–2–methylbutane
4. 1–bromo–2, 2–dimethylpropane

Q.

Write structures of all the alkenes which on hydrogenation give 2-methylbutane.

Q. When acetone is treated with sodium bisulphite, the compound formed is:

1. 
2. 
3. 
4. 

Q. Propiophenone on reaction with hydrazine in presence of potassium hydroxide with ethylene glycol gives:

1. Reduction reaction
2. Oxidation reaction
3. Substitution reaction
4. (a) and (c) above.

Q. The major product in the following conversion is:

1. 
2. 
3. 
4. 

Q. 27. On reaction of benzamide (PhCONH2)with POCl3 the product is- (1)phenylcyanide (2)benzamine (3)chlorobenzene (4)aniline Explain with mechanism

Q.

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with b-Butyl lithium - a strong base to give a yhosphorus ylid.
Which of the following would yield the hydrocarbon:

1. None of the above

2. phenylacetaldehyde

3. 

4. 

Q.

What is Testing ?

Q. (D) gives positive Tollens' test, whereas (C) does not. The correct statement(s) given below is/are:

1. (A) and (C) are the same compound
2. (A) and (D) are the same compound
3. (B) and (E) are the same compound
4. (E) on reductive ozonolysis gives (D) as one of the products

Q. anisole react with HI to give phenol & methyl iodide& not idobenzene & methylalcohol.give reason.

Q.

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with n-Butyl lithium - a strong base to give a phosphorus ylid.
Which of the following, on treatment with the said ylid - would yield the hydrocarbon:

1. benzaldehyde

2. phenylacetaldehyde

3. hexan-1-one

4. cyclohexanone

Q.
Difference in the molar mass of (D) and (A) is: g/mol

Q. An enzyme contains 5.6% Fe calculate number of Fe atoms present in 1g of enzyme

Q.

Write structures of all the alkenes which on hydrogenation give 2-methylbutane.

Q. What will be the product of these Bayer-Villiger Oxidations ? 1) CH3-CO-CO-CH3 2) Ph-CH2-CO-CH3

Q. What happen 1)when benzene is treated with base 2 )when Toluene is treated with base

Q.

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with n-Butyl lithium - a strong base to give a phosphorus ylid.
Which of the following, on treatment with the said ylid - would yield the hydrocarbon:

1. benzaldehyde

2. phenylacetaldehyde

3. hexan-1-one

4. cyclohexanone

Q. Which of the following sentences is/are true?

1. Schrock carbene does nucleophilic reactions
2. Both (A) and (B)
3. None
4. Fischer carbene does electrophilic reactions

Q.

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with b-Butyl lithium - a strong base to give a yhosphorus ylid.
Which of the following would yield the hydrocarbon:

1. 

2. 

3. phenylacetaldehyde

4. None of the above

Q.

From the reactions shown, A and B respectively are:

1. A: Hydrazine, KOH and heat; B: Zn-Hg HCl heat

2. A: Zn-Hg HCl heat; B: cracking

3. A: Zn-Hg HCl heat; B: aldol addition

4. A: Hydrazine, KOH and heat; B: $(Ph{)}_{3}P=C{H}_2$

Q. Name the following compounds C2H5 , CH2OH - CH2OH , CH2OH-CH2OH - CH2OH

Q. 3. pyridine is less basic than triethyl amine. A)pyridine has aromatic character. B)N in pyridine is sp2 hybridised C)in Pyridine lone pair of N is decolalised

Q.

1. 

2. 

3. 

4. 

Q.

From the reactions shown, A and B respectively are:

1. A: Zn-Hg HCl heat; B: cracking

2. A: Zn-Hg HCl heat; B: aldol addition

3. A: Hydrazine, KOH and heat; B: Zn-Hg HCl heat

4. A: Hydrazine, KOH and heat; B: $(Ph{)}_{3}P=C{H}_2$

Q.

Benzyl bromide, on treatment with a nucleophile - triphenylphosphine, is then made to react with n-Butyl lithium - a strong base to give a phosphorus ylid.
Which of the following, on treatment with the said ylid - would yield the hydrocarbon:

1. benzaldehyde

2. phenylacetaldehyde

3. hexan-1-one

4. cyclohexanone

Q. Give the reagent that best accomplishes the following transformation:

1. $H_{2}S{O}_4$, Heat
2. $H_{2}S{O}_4,H_{2}O$
3. $(C{H}_{3}COO{)}_{2}Hg/NaB{H}_4/H_{2}O$
4. $B{H}_3,THF,H_2{O}_2,NaOH$

Q.

CONVERT TOLUENE TO BENZYLCHLORIDE .

Q. Fehling's test is positive for

1. Acetaldehyde
2. Benzaldehyde
3. Ether
4. Alcohol

Q. which of the following is endothermic:-
H ---> H^-1
OR
O ----> O₂^-1
give reason