Question

Which of the following reactions involves carbon-carbon bond formation

• A. Reimer-Tiemann reaction
• B. Hydroboration oxidation
• C. Cannizzaro reaction
• D. Reaction of primary alcohol with PCC

Answer 1

Answer: (A)

Reimer-Tiemann reaction

Answer 2

Ortho-para directing groups activate the benzene ring towards electrophilic substitution while meta directing groups deactivate the benzene nucleus towards electrophilic substitution. $??,??l,??r$ and $??$ (i.e., halogens) are exceptions to the above rule. These groups are $o-, p$ -directing but deactive the benzene ring