Wittig Ylid
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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:
benzaldehyde
phenylacetaldehyde
hexan-1-one
cyclohexanone
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:
None of the above
phenylacetaldehyde
From the reactions shown, A and B respectively are:
A: Zn-Hg HCl heat; B: cracking
A: Zn-Hg HCl heat; B: aldol addition
A: Hydrazine, KOH and heat; B: Zn-Hg HCl heat
A: Hydrazine, KOH and heat; B: (Ph)3P=CH2

- (A) and (C) are the same compound
- (A) and (D) are the same compound
- (B) and (E) are the same compound
- (E) on reductive ozonolysis gives (D) as one of the products

Difference in the molar mass of (D) and (A) is:
Write structures of all the alkenes which on hydrogenation give 2-methylbutane.
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:
benzaldehyde
phenylacetaldehyde
hexan-1-one
cyclohexanone
From the reactions shown, A and B respectively are:
A: Hydrazine, KOH and heat; B: Zn-Hg HCl heat
A: Zn-Hg HCl heat; B: cracking
A: Zn-Hg HCl heat; B: aldol addition
A: Hydrazine, KOH and heat; B: (Ph)3P=CH2
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:
phenylacetaldehyde
None of the above