Which of the following statements is false?

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(B) $HCHO$ (formaldehyde) is the most reactive aldehyde in its homologous series due to the absence of electron-donating alkyl groups and minimal ster

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$HCHO$ is least reactive in its homologous series

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(B) $HCHO$ (formaldehyde) is the most reactive aldehyde in its homologous series due to the absence of electron-donating alkyl groups and minimal steric hindrance. Therefore,the statement that $HCHO$ is the least reactive is false. $40 \%$ solution of $HCHO$ is indeed called formalin. Branching in iso-valeraldehyde decreases the surface area compared to $n$-valeraldehyde,leading to a lower boiling point. Ketones generally have higher boiling points than isomeric aldehydes due to the higher dipole moment of the carbonyl group.

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