Question

Which reaction is used to synthesize straight-chain alkylbenzenes?

• A. Etard
• B. Rosenmund reduction
• C. Stephen's reaction
• D. Wolf kishner reduction

Hint:

Direct alkylation of benzene rearranges the carbocation. Acylation followed by reduction avoids this.

Answer 1

The Correct Option is D

Step 1: Check the Options
Etard gives an aldehyde, Rosenmund reduction gives an aldehyde from an acid chloride and Stephen reaction gives an aldehyde from a nitrile.

Step 2: Needed Change
A ketone must be turned into a $\text{CH}_2$ group.

Step 3: Select
Only Wolff-Kishner reduction does this.

Final Answer:
Only Wolff-Kishner reduction removes the carbonyl oxygen and keeps the chain straight. \[ \boxed{\text{(D) }\text{Wolf kishner reduction}} \]