Question

Identify A and B in the reaction

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is D

Identify A and B in the Reaction 

Step 1: Elimination Reaction with Alcoholic KOH
When 1-bromopropane (CH₃CH₂CH₂Br) is heated with alcoholic KOH, it undergoes β-elimination to form propene (CH₃CH=CH₂).

Reaction:
CH₃CH₂CH₂Br + alc. KOH → CH₃CH=CH₂ + H₂O + KBr

So, A is: CH₃CH=CH₂ (Propene)

Step 2: Electrophilic Addition with Br₂
Propene reacts with bromine to give 1,2-dibromopropane.

Reaction:
CH₃CH=CH₂ + Br₂ → CH₃CHBrCH₂Br

So, B is: CH₃CHBrCH₂Br (1,2-Dibromopropane)

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Final Answer:

• A = CH₃CH=CH₂ (Propene)
• B = CH₃CHBrCH₂Br (1,2-Dibromopropane)