The product obtained by dry distillation of calcium formate on reacting with ammonia yields

Give the main product of the following reactions:
$(i)$ $1, 2-$dibromopropane + alcoholic $KOH$
$(ii)$ $1, 1, 2, 2-$tetrabromoethane + zinc powder in methanol

The number of isomeric tetraenes ($NOT$ containing $sp$-hybridized carbon atoms) that can be formed from the following reaction sequence is.....

The products obtained in the above Wurtz reaction are:

Classify hydrocarbon compounds and provide examples.

Which of the following substituted benzene derivatives would furnish three isomers in significant amount when one more substituent is introduced: