The structure of product $(A)$ is:

An isomer of $C_5H_{12}$ on reaction with $Br_2 / \text{light}$ gave only one isomer $C_5H_{11}Br(X)$. Reaction of $X$ with $AgNO_2$ gave $Y$ as the major product. What is $Y$?

The reactivity of alkyl bromides towards iodide ion in dry acetone decreases in the order:
$I. CH_3CH_2Br$
$II. CH_3-CH(CH_3)-Br$
$III. CH_3-C(CH_3)_2-Br$
$IV. CH_3Br$

The reactivity of the halogen atom is minimum in:

Indicate the correct order of bond energy for the following.

Find the reactants which on heating with alcoholic $KOH$ produce the compound $CH_3-CH_2-CH_2-CH=CH_2$.
$(i) \ CH_3-CH(Br)-CH_2-CH_2-CH_3$
$(ii) \ CH_3-CH_2-CH(Br)-CH_2-CH_3$
$(iii) \ CH_3-CH_2-CH_2-CH_2-CH_2Br$
$(iv) \ CH_3-CH_2-CH_2-CH(Br)-CH_3$