MCQ
Identify $'A'$ in the following reaction :


- A

- ✓

- C

- D








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Find out the correct statement from the options given below for the above $2$ reactions.

$A\xrightarrow[(ii)\;H_3O^+]{(i)\;CH_3MgBr}B\xrightarrow[573\;K]{Cu}2-$methyl $2-$butene
The mass percentage of carbon in $A$ is