Through which of the following reactions number of carbon atoms can be increased in the chain ?

In which of the following reactions, the number of carbon atoms does not decreases

Which of the following contains largest number of carbon atoms ?

Number of carbon atoms in the main chain.

In which of the following compounds is the numbering of carbon atoms in the chain correct?

Which of the following reactions increases the number of carbon atoms In the chain Grignard reaction Cannizzaro's reaction Aldol reaction HVZ reaction Choose the correct option.