Identify product D in the following reaction sequence :
CH3−CH3|C|−CH3CH2CH2OHK2Cr2O7;H2SO4−−−−−−−−−−→H2OheatASOCl2−−−−→B(CH3)2NH−−−−−−−→(2mole)C1.LiAlH4diethylether−−−−−−−−−−−−−→2.H2OD