Answer:
Methane is produced as a new product.
Explanation:
[tex]CH_{3}MgBr[/tex] acts as a base toward -COOH group in p-methylbenzoic acid.
Hence an acid-base reaction occurs between p-methylbenzoic acid and [tex]CH_{3}MgBr[/tex] to produce methane and p-methylbenzoate.
[tex]H_{3}O^{+}[/tex]addition will convert p-methylbenzoate back to p-methylbenzoic acid.
Hence, methane is produce as a new product.
Reaction sequences are given below.
