Draw the cyclic polygon formulae for all the possible structural isomers having the molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$.

$0.6723$ 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.

$0.2475 \mathrm{g}$of an organic substance gave on combustion $0.495 \mathrm{g}$ of ${\mathrm{CO}}_2$ and $0.2025 \mathrm{g}$ of ${\mathrm{H}}_2\mathrm{O}$. Calculate the percentage of carbon and hydrogen in it.

$0.2046 \mathrm{g}$ of an organic compound gave $30.4 \mathrm{mL}$ of moist nitrogen measured at $288 \mathrm{K}$and $732.7 \mathrm{mm}$ pressure. Calculate the percentage of nitrogen in the substance (Aqueous tension at $288 \mathrm{K}$ is $12.7 \mathrm{mm}$).

$0.27 \mathrm{g}$ of an organic compound gave on combustion$0.396 \mathrm{g}$of ${\mathrm{CO}}_2$ and $0.216 \mathrm{g}$ of ${\mathrm{H}}_2\mathrm{O}$. $0.36 \mathrm{g}$ of the same substance gave $48.88 \mathrm{mL}$ of ${\mathrm{N}}_2$ at $290 \mathrm{K}$ and $740 \mathrm{mm}$ pressure. Calculate the percentage composition of the compound.

$0.2 \mathrm{g}$ of an organic compound on Kjeldahl’s analysis gave enough ammonia to just neutralize $20 \mathrm{mL}$ of $0.1 \mathrm{N}$ ${\mathrm{H}}_2{\mathrm{SO}}_4$. Calculate the percentage of nitrogen in the compound.

$0.4422 \mathrm{g}$ of an organic compound was Kjeldahlised and ammonia evolved was absorbed in $50 \mathrm{mL}$ of semi molar $(0.5 \mathrm{M})$ ${\mathrm{H}}_2{\mathrm{SO}}_4$. The residual acid required $131 \mathrm{mL}$ of $0.25 \mathrm{M}$ $\mathrm{NaOH}$. Determine the percentage of nitrogen in the compound.