The correct product of the following sequence of reactions

The correct product of the following sequence of reactions
  1. $\left(\mathrm{CH}_{3}ight)_{2} \mathrm{CH} \mathrm{CH} \mathrm{Br} \mathrm{COOH}$
  2. $\left(\mathrm{CH}_{3}ight)_{2} \mathrm{CHCH}_{2} \mathrm{COOH}$
  3. $\left(\mathrm{CH}_{3}ight)_{2} \mathrm{CH} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$
  4. $\left(\mathrm{CH}_{3}ight)_{2} \mathrm{C}=\mathrm{CHCOOH}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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