Nucleophilic addition reaction will be most favoured in:

Fehling's solution is a mixture of two solutions. One of them is $CuSO_4$. What does the other solution contain?

Consider the reactions and identify $A, X, Y$ and $Z$:
$X (C_2H_6O)$ $\xrightarrow{Cu, 573 \ K} A$ $\xrightarrow{[Ag(NH_3)_2]^+, ^-OH, \Delta} \text{Silver mirror}$
$A \xrightarrow{^-OH, \Delta} Y$
$A \xrightarrow{NH_2NHCONH_2} Z$

$3 CH_3COCH_3 \xrightarrow{HCl} (CH_3)_2C = CH - CO - CH = C(CH_3)_2$
This product $B$ is obtained when acetone is saturated with hydrogen chloride gas. $B$ can be:

Compare the stability of the enolate formed from $A$ (cyclohexane$-1,3-$dione) and $B$ (cyclohexane$-1,4-$dione).
Which of the following statements is true?

Which of the following compounds does not react with Tollen's reagent?