Among the given compounds,the most susceptible to nucleophilic attack at the carbonyl group is

Arrange the following in order of increasing reactivity (least $\to$ most) towards nucleophilic acyl substitution:
$1. CH_3COCH_2CH_3$,$2. CH_3COCl$,$3. CH_3CONHCH_3$

Which of the following carboxylic acids is most reactive towards esterification?

When carboxylic acid reacts with organolithium reagents to give ketones,side reactions sometimes occur. For example,
$HOCH_2CH_2CH(CH_3)CH_2CH_2COOH$ $\xrightarrow[(x) \, CH_3Li]{tetrahydro\,furan}$ $\xrightarrow[NH_4Cl]{H_2O}$ $\underset{63\%}{\text{Compound } A: HOCH_2CH_2CH(CH_3)CH_2CH_2COCH_3}$ + $\underset{37\%}{\text{Compound } (B)}$
The value of $(x)$ in the above reaction is:

In the following transformation,reagents $1$ and $2$ are:

Consider the given reaction: $RCOOAg \xrightarrow{Br_2/\Delta} R-Br$. Which one of the following acids will give the maximum yield of $R-Br$ in the above reaction?