Total number of compounds in which $- I$ groups are present are:

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Solution

The correct option is A 3
Electron withdrawing groups $(- F, - C N$ and alkyne $)$ lead to the development of ẟ+ charge on the carbon atom sharing a bond with the electron withdrawing substituents. Electron withdrawing groups pull electron density towards it being more electronegative in nature. Therefore in options (i), (ii) and (iv), $- I$ groups are present.

Electron donating group $(- C (C H_{3})_{3})$ leads to the development of ẟ- charge on the carbon atom sharing a bond with the electron donating substituent. Therefore in option (iii), $+ I$ group is present.

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