An alkene of molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{18}$, on ozonolysis gives $2, 2-$dimethylpropanal & $2 -$butanone, then the alkene is

The oxidation of toluene with ${\mathrm{CrO}}_3$ in the presence of ${\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}$ gives a product $\mathrm{A}$, which on treatment with aqueous $\mathrm{NaOH}$ produces

Which of the following does not give formaldehyde on heating or distillation?

${\mathrm{CH}}_3\mathrm{CHO}+{\mathrm{H}}_2\mathrm{NOH}\to {\mathrm{CH}}_3\mathrm{CH}=\mathrm{NOH}+{\mathrm{H}}_2\mathrm{O}$

The above reaction occurs at

Propanal, on reaction with dilute $\mathrm{NaOH}$ forms:

Acetaldehyde reacts with phosphorus pentachloride to produce:

Which of the following reagents cannot be used to distinguish between hexanal and $2-$ hexanone?