Question

A new carbon-carbon bond formation is possible in(a) Cannizzaro reaction (b) Friedel–Craft alkylation(c) Clemmensen reduction(d) Reimer–Tiemann reaction

Answer 1

New carbon-carbon bond formation take place in Friedel Craft?s alkylation and Reimer-Tiemann reaction. In Friedel Craft?s alkylation following mechanism involve \[R-Cl+AlC{{l}_{3}}\] ⇌ \[\underset{\text{Alkyl carbonium ion}}{\mathop{{{R}^{\oplus }}}}\,+AlCl_{4}^{}+HCl\] Here new C-C bond formed between carbon of benzene ring and alkyl group. Similarly in Reimer-Tiemann reaction. Here new C-C bond formed between carbon of benzene ring and -CHO group.

Answer 2

refer to the attachment