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The correct chemical formula for 2, 3-dimethylbutane and 3, 3-dimethylpentane is.

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C H_{3} C H_{2} C (C H_{3})_{2} C H_{2} C H_{3}

and

(C H_{3})_{2} CHCH (C H_{3})_{2} {_{}}_{}

C H_{3} C H_{2} C (C H_{3})_{2} C H_{2} C H_{3}

and

(C H_{3})_{2} CHCH (C H_{3})_{2} {_{}}_{}

(C H_{3})_{2} CHCH (C H_{3})_{2}

and

C H_{3} C H_{2} C (C H_{3})_{2} C H_{2} C H_{3}

C H_{3} CH (C H_{2}) CH (C H_{2}) C H_{3}

and

C H_{3} C H_{2} CH (C H_{2})_{2} C H_{2} C {H_{3}}_{}_{}^{}

answer is A.

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Detailed Solution

The correct chemical formula for 2, 3-dimethylbutane and 3, 3-dimethylpentane is

(C H_{3})_{2} CHCH (C H_{3})_{2}

and

C H_{3} C H_{2} C (C H_{3})_{2} C H_{2} C H_{3}

.
2, 3-dimethylbutane is an isomer of hexane. It is a colourless liquid. It has the chemical formula

(C H_{3})_{2} CHCH (C H_{3})_{2} {_{}}_{}

.
3, 3-dimethylpentane is an isomer of heptane. It has chemical formula

C H_{3} C H_{2} C (C H_{3})_{2} C H_{2} C H_{3}

With 2 ethyl groups, the longest chain consists of 5 carbon atoms with 2 ethyl groups connected at the 3rd carbon atom; that’s why it is called 3, 3-dimethylpentane.

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