Aqueous solution of sodium salt of $2-$methylbutanedioic acid on Kolbe's electrolysis gives:

In the reaction $CH_3CH=CH_2 + H_2O + [O]$ $\xrightarrow{KMnO_4/Acid} CH_3-CH(OH)-CH_2(OH)$ $\xrightarrow{[O]} X + HCOOH$,what is $X$?

Which of the following compounds has the least heat of hydrogenation?

$CH_3-CH(CH_3)-CH=CH_2 + HBr \to X$ (major product). $X$ is:

When a tertiary alcohol $A$ $(C_4H_{10}O)$ reacts with $20\% \ H_3PO_4$ at $358 \ K$,it gives a compound $B$ $(C_4H_8)$ as a major product. The $IUPAC$ name of the compound $B$ is

Which of the following products is not formed during the reaction: $CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{Br_2/aq. NaCl}$?