Identify-I effect causing group form following.

1. $-\mathrm{COOR}$
2. $-\mathrm{CH}_3$
3. $-\mathrm{C}_2 \mathrm{H}_5$
4. $-\mathrm{C}_3 \mathrm{H}_7$

Asked in: MHT CET 2021 (20 Sep Shift 1)

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