How many isomers of monobromo derivatives are obtained on the bromination of the following compound?

Which of the following statements is incorrect regarding the members of the homologous series of alkanes?

Consider the following reaction,$CH_3-CH(D)-CH(CH_3)-CH_3 + \dot{Br} \to X + HBr$. Identify the structure of major product $X$.

In which of the following reactions does the carbon number not change on product formation?
$(i)$ Hydrogenation
$(ii)$ Alkyl halide reduction
$(iii)$ Wurtz reaction
$(iv)$ Decarboxylation
$(v)$ Kolbe reaction

Identify the major product $'E'$ in the following reaction sequence:
Cyclohexane $\xrightarrow{Br_2, h\nu} (A)$ $\xrightarrow{Na, D.E.} (B)$ $\xrightarrow{Br_2, h\nu} (C)$ $\xrightarrow{H_2O} (D)$ $\xrightarrow{conc. H_2SO_4} (E)$

Only two isomers of monochloro product are possible for which of the following?