$CH_3-CH(NH_2)-CH_3$ $\xrightarrow{HNO_2} A$ $\xrightarrow{\text{oxidation}} B$ $\xrightarrow[(ii) H_2O]{(i) CH_3MgI} C$. $C$ is:

Grignard reagent reacts with compounds containing which of the following groups?

If formaldehyde and $KOH$ are heated,then we get

Given below are two statements:
Statement $I$: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement $II$: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.
In the light of the above statements, choose the correct answer from the options given below:

Predict the product $X$ for the following reaction:
$2\text{-oxocyclohex-3-en-1-yl} \text{ acetate derivative} \rightarrow{NaBH_4, MeOH} X$

Given below are two statements:
Statement $I:$ The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions.
Statement $II:$ The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of $H$-bonding.
In the light of the above statements,choose the most appropriate answer from the options given below: