3 ghante pehle positive negative deviation ki trick banayi
ccl4(+ve) > chcl3(-ve) > benzene(+ve) > acetone(-ve)
basically ccl4 ke saath kuch bhi ho to positive, wahin chcl3 ke saath kuch bhi ho(except ccl4) to negative, benzene ke saath kuch bhi except the previous ones to positive, aur agar acetone ke saath kuch bhi ho except pehle wale to negative.
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