Which of the following can decolorize aldehydes and ketones?

For the given reaction,find the sum of $x + y = ?$
$CH_3-CH_2-CO-CH_3 \xrightarrow[(ii) \ y \ mol \ NaNH_2]{(i) \ x \ mol \ PCl_5} CH_3-C \equiv C-CH_3$

Aldehydes and ketones give pure addition reaction with:

Which of the following sets of reagents,used in the order shown,would successfully accomplish the conversion shown?

The best reagent to convert $pent-3-en-2-ol$ into $pent-3-yn-2-one$ is

Which of the following is an example of a conjugated diketone?