(a) The 1HNMR spectrum of compound A,C4H8Cl2, consists of the following signals: 1.60(d,3H),2.15(m,2H),3.72(t,2H), and 4.27 (m, 1H). Draw the structural formula of compound A. - You do not have to consider stereochemistry. - Explicitly draw all H atoms. (b) The 1H-NMR spectrum of compound B,C4H8O2, consists of the following signals: 1.2 ( t,3H ), 2.1 (s, 3H ), and 4.1 (quartet, 2H ); contains an ester. Draw the structural formula of compound B