It required 0.7 g of a hydrocarbon (A) to react completely with $B r_{2}$ (2.0g) and form a non-resolvable product. On treatment of (A) with $H B r$ , it yielded monobromo alkane (B) The same compound (B)was obtained when (A) was treated with $H B r$ in presence of peroxide. Write down the structural formula of (A) and (B) and explain the reactions involved.

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It required 0.7 g of a hydrocarbon (A) to react completely with $B r_{2}$ (2.0g) and form a non-resolvable product. On treatment of (A) with $H B r$ , it yielded monobromo alkane (B) The same compound (B)was obtained when (A) was treated with $H B r$ in presence of peroxide. Write down the structural formula of (A) and (B) and explain the reactions involved.

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