In the reaction, How many electron donating groups are attached with the carbon atom of unsaturated part of the product ' $B$ ' ?

• Correct answer
  A

  Two
• B

  Three
• C

  Four
• D

  None of these

Solution

There are two electron donating groups present at the carbon of unsaturated part of product ' $D$ ', i.e. $C \equiv C$.

Hence, the correct answer is option: 'A'.