ok sir and when we are able to send pictures of the question ..sir ??
Priyanshu kumar
https://drive.google.com/file/d/124-CvlIWVpZmzbQpmulmUOsctkkcFw8T/view?usp=drivesdk for more detail there is link of peter sykes book...go through it it surely helps
yes these are different, SE1 and SE2 are electrophilic substitution reaction, SN1 Aand SN2 are nucleophilic substitution reaction and E1 and E2 are elimination reaction