2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

1. 
2. ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_3\mathrm{C}-\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$
3. ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_2\mathrm{C}=\mathrm{C}\mathrm{H}-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_3$
4. ${\left(\mathrm{C}{\mathrm{H}}_3\right)}_2\mathrm{C}\mathrm{H}-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$

Asked in: NEET 2015 (Phase 2)

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