An 'Assertion' and a 'Reason' are given below. Choose the correct answer from the following options :
Assertion (A) : Vinyl halides do not undergo nucleophilic substitution easily.
Reason (R) : Even though the intermediate carbocation is stabilized by loosely held p-electrons, the cleavage is difficult because of strong bonding.

The IUPAC name for the following compound is :

The C–C bond length is maximum in :

What will be the major product when m-cresol is reacted with propargyl bromide (HC$$ \equiv $$C–CH₂Br) in presence of K₂CO₃ in acetone?