When $HNO_3$ is reacted with $ . . . . . . $,chloropicrin is formed.

The reaction of $t-$butyl bromide with sodium methoxide mainly gives .............

Identify the products formed in the following reaction: $CH_3-CH_2-CH_2-CHBr-CH_3 \xrightarrow{KOH / C_2H_5OH} ?$

Rank the following compounds in order of decreasing rate of solvolysis with aqueous ethanol (fastest $\to$ slowest):
$(1)$ $CH_2=C(CH_3)Br$
$(2)$ $1-bromo-1-methylcyclohexane$
$(3)$ $CH_3-CH(Br)-CH_2-CH(CH_3)_2$

Benzyl bromide on reaction with magnesium in the presence of dry ether gives $'X'$. $'X'$ on reaction with ethanol gives $'Y'$. Then the compound $Y$ is

The major product of the above reaction is: