Write the condensed formula for the compound, methyl t-butyl ether.

Write the condensed formula for the compound, $2$-chloro-$1,1,1$-trifluoroethane.

Write the condensed formula for the compound, $2$-Methylbuta-$1,3$-diene.

Write the condensed formula for the compound, But-$2$-en-$1$-ol.

$0.6723$ grams of an organic compound gave in combustion $1.530$ grams of carbon dioxide and $0.625$ grams of water. Find the percentage if carbon and hydrogen in the compound.

$0.465$ grams of an organic substance gave on combustion $1.32$ grams of ${\mathrm{CO}}_2$ and $0.315$ grams of ${\mathrm{H}}_2\mathrm{O}$. Calculate the percentage of carbon and hydrogen in the compound.