1.The correct increasing order of the reactivity of halides for SN_NN1 reaction is:a.CH3_33CH2_22X <<< (CH3_33)2_22CH−-−X <<< CH2_22=CHCH2_22X <<< PhCH2_22Xb.(CH3_33)2_22CH−-−X <<< CH3_33CH2_22X <<< CH2_22=CHCH2_22X <<< PhCH2_22Xc.PhCH2_22X <<< (CH3_33)2_22CH−-−X <<< CH3_33CH2_22X <<< CH2_22=CHCH2_22Xd.CH2_22=CHCH2_22X <<< PhCH2_22X <<< (CH3_33)2_22CH−-−X <<< CH3_33CH2_22XLogin to continueOnly logged in users canattempt or see the solution.