Identify optically active substance from the following.

Identify optically active substance from the following.
  1. $\mathrm{CH}_3 \mathrm{CH}(\mathrm{Br}) \mathrm{CH}_2 \mathrm{CH}_3$
  2. $\left(\mathrm{CH}_3\right)_2 \mathrm{C}(\mathrm{Br}) \mathrm{CH}_3$
  3. $\mathrm{CH}_3\left(\mathrm{CH}_2\right)_3 \mathrm{CH}_2 \mathrm{Br}$
  4. $\left(\mathrm{CH}_3\right)_2 \mathrm{CHCH}(\mathrm{Br}) \mathrm{CH}\left(\mathrm{CH}_3\right)_2$

Asked in: MHT CET 2022 (06 Aug Shift 2)

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