Among the following which has greater $+ I$ effect?

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

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

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C H_{3} - C H_{2} - C H_{2} - C H_{2} - C H_{2} -

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C H_{3} - C H (C H_{3}) - C H (C H_{3}) -

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Solution

The correct option is B $(C H_{3})_{3} C - C -$
$(C H_{3})_{3} C -$
$- C H_{3}$ group has electrons releasing inductive $(+ I)$ effect. Greater the number of $C H_{3} -$ groups attached to the same carbon atom, larger will be the $+ I$ effect of the molecule.
The $+ I$ effect increases in order :
$- C H_{3} < 1^{o} < 2^{o} < 3^{0}$ .

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Write the IUPAC name of $C H_{3} - C H_{2} - C H (C H_{3}) - C H_{2} - C H_{2} - C H_{2} - C H_{3}$ .

C H_{3} - C H_{2} - C H_{2} - C H (C H_{3}) - C H_{3}

C H_{3} - C H (C H_{2} - C H_{3}) - C H_{2} - C H_{2} - C H_{3}

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C H_{3} - C H_{2} - C H_{2} - C \equiv C H

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C H_{3} - C H_{2} - C \equiv C - C H_{3}

C H_{3} - C H (C H_{3}) - C H (C H_{3}) - C H = C H - C H_{2} - C H O

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