$A$ hydrocarbon reacts with hypochlorous acid to give $1-$chloro$-2-$hydroxyethane. The hydrocarbon is

Predict the major product $A$ for the following reaction:
$2\text{-methylbuta-1,3-diene} + HBr (1 \text{ eq.}) \xrightarrow{-80^{\circ}C (1,2\text{-addition})} A$

Indirect hydration of an alkene cannot produce only one alcohol. This alcohol is $......$.

For the reaction given below,which of the following is not a possible product?
$H_2C=CH_2 + Br_{2(aq)} \xrightarrow{NaCl} \text{Products}$

In which of the following reactions does the product contain a chiral center?

Addition of $HCl$ to $3,3$-dimethyl-$1$-butene yields two products,one of which has a rearranged carbon skeleton. Among the following carbocations,select the possible intermediates in that reaction:
$1.$ $(CH_3)_3C-C^+H-CH_3$
$2.$ $(CH_3)_3C-CH_2-C^+H_2$
$3.$ $(CH_3)_2C(Cl)-C^+(CH_3)_2$
$4.$ $(CH_3)_2C^+-CH(CH_3)_2$