Friday, October 26, 2007

Study Guide TMH Chemistry 34. Exercises in Organic Chemistry

JEE question 2007 Paper II

Riemer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes.

1. Which one of the following reagents is used in the above reaction?
(A) aq.NaOH+ CH-3Cl
(B) aq.NaOH+ CH-2Cl-2
(C) aq.NaOH+ CHCl-3
(D) aq.NaOH+ CCl-4

Answer C

Reimen-Tiemann reaction takes place is presence of aq. NaOH+ CHCl3

2. The electrophile in this
(A) :CHCl
(B) +CHCl-2
(C) :CCl-2
(D) :CCl-3

Answer: C

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