With anhydrous zinc chloride,ethylene glycol gives:

The product of the following reaction is:
$CH_3CH_2CH_2CH=CH_2 \xrightarrow[(ii) H_2O_2, OH^-]{(i) BH_3/THF} \text{Product}$

Assertion : Addition of $HBr$ on $2-$butene gives two isomeric products.
Reason : Addition of $HBr$ on $2-$butene follows Markovnikov rule.

Which of the following alkyl-substituted alkenes is the most stable?

Which one of the following organic compounds decolourizes an alkaline $KMnO_4$ solution?

$A$ hydrocarbon with molecular formula $C_6H_{10}$ absorbs only one molecule of $H_2$ upon hydrogenation. Ozonolysis of the hydrocarbon yields $OHC-CH_2-CH_2-CH_2-CH_2-CHO$. The hydrocarbon is: