Number of bromo derivatives obtained on treating ethane with excess of $\mathrm{Br}_{2}$, in diffused sunlight is...

JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Hydrocarbons

Number of bromo derivatives obtained on treating ethane with excess of

Br_{2}

, in diffused sunlight is...

Answer: 9

Solution

Free-radical bromination of ethane with excess bromine replaces hydrogen atoms successively, and every distinct structural arrangement is counted. One monobromo product,

C H_{3} C H_{2} Br

, is possible. Two dibromo products arise,

C H_{3} CHB r_{2}

and

C H_{2} BrC H_{2} Br

. Two tribromo products form,

C H_{3} CB r_{3}

and

C H_{2} BrCHB r_{2}

. Two tetrabromo products form,

CHB r_{2} CHB r_{2}

and

C H_{2} BrCB r_{3}

. One pentabromo product,

CHB r_{2} CB r_{3}

, and one hexabromo product,

CB r_{3} CB r_{3}

, complete the set. Adding these gives

1 + 2 + 2 + 2 + 1 + 1 = 9

bromo derivatives.

JEE Main · 2023 · 06 Apr 2023 · Shift 1 · Integer answer

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