Which of the following pairs cannot be distinguished by Tollen's reagent?

Acetaldehyde can be converted into $C(CH_2OH)_4$ (pentaerythritol) by which reagent?

Aldehydes are more reactive than ketones towards nucleophilic attack because of?

Given below are two statements:
Statement $I$: $H_2N-CO-CH_2-CH_2-CO-CH_3$ under Clemmensen reduction conditions will give $HOOC-(CH_2)_3-CH_3$.
Statement $II$: $CH_3-CH(CH_3)-CH_2-CH(Cl)-CO-CH_3$ under Wolff-Kishner reduction conditions will give $CH_3-CH(CH_3)-CH_2-CH(Cl)-CH_2-CH_3$.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following will give a yellow precipitate $(ppt.)$ with iodine and alkali?

Which of the following aldehydes will undergo the Cannizzaro reaction with a base?