Wittig Ylid

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.

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.

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

Q.

1. 

2. 

3. 

4. 

Q.

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

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.

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.

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