[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f3kJl3-nFgVhR9ZChDsKhiJ4PJZuiO-TkRXGvkn126bw":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":11,"question":18,"related":19,"source":29,"type":30},[],"2023-06-08 14:27:34",53102342,[8,9,10],"a=b=c","c>a>b","b>a>c",{"count":12,"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},48,"29c82fa2868eef3477844bafdba0af08","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F492b6379f7d5bf521e50e902cad80b47.jpg","应用波谱学","exam_93249786","Quiz 3 核磁共振谱(32)","3个不同质子Ha, Hb, Hc,其屏蔽常数的大小次序为sb>sa>sc..这3种质子的化学位移次序是",[20,31,40,43,52,61,70,79,88,97],{"answer":21,"createTime":5,"id":22,"options":23,"question":28,"source":29,"type":30},[],53102340,[24,25,26,27],"B","A","D","C","某化合物分子式C5H10Br2,1H NMR谱只有两个单峰,面积比2:3,其结构式是\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F46665195900c7981bc775cdf9e1c08b2.jpg\">","v1",0,{"answer":32,"createTime":5,"id":33,"options":34,"question":39,"source":29,"type":30},[],53102341,[35,36,37,38],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F97f4e97c85d684957a375e5b52c4412d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1d5335569ea4c7e17cd1667acefea9f8.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6413edfd46f0f93efc025c2f52aecd35.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F18b648bfe1e79bc78a0452f17ec62514.png\">","化合物 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F054f28d002309c551cf5231ef012ef55.png\"> 中的两个亚甲基属于何种自旋体系",{"answer":41,"createTime":5,"id":6,"options":42,"question":18,"source":29,"type":30},[],[8,9,10],{"answer":44,"createTime":5,"id":45,"options":46,"question":51,"source":29,"type":30},[],53102343,[47,48,49,50],"J是具有磁矩的原子核自旋偶合强弱的量度","J的大小与外磁场强度有关","J的单位是赫兹(Hz)","通过双数键的J为负值,单数键的J为正值","有关偶合常数J,以下描述不正确的是",{"answer":53,"createTime":5,"id":54,"options":55,"question":60,"source":29,"type":30},[],53102344,[56,57,58,59],"6 : 3 : 1","6 : 1 : 2","3 : 1 : 2 : 1","6 : 1 : 2 : 1","在 (CH3)2CHCH2 - OH 中核磁共振吸收峰面积之比为哪一组数据",{"answer":62,"createTime":5,"id":63,"options":64,"question":69,"source":29,"type":30},[],53102345,[65,66,67,68],"(CH3)2CHCOCH3","CH3CH2CH2COCH3","CH3CH2COCH2CH3","(CH3)3C-CHO","分子式为C5H10O的化合物,其NMR谱上只出现两个单峰,最有可能的结构式为",{"answer":71,"createTime":5,"id":72,"options":73,"question":78,"source":29,"type":30},[],53102346,[74,75,76,77],"–OCH3","–CH=CH2","-CHO","–CH2CH3","苯环上哪种取代基存在时,其芳环质子化学位移值最大",{"answer":80,"createTime":5,"id":81,"options":82,"question":87,"source":29,"type":30},[],53102347,[83,84,85,86],"苯环上p电子离域到硝基上,减少了邻对位碳上的电荷密度,使邻位和对位碳化学位移值减小","硝基的电子将离域到苯环的电子体系上,增加了邻位和对位碳上的电荷密度,使邻位和对位碳化学位移值增大","硝基的电子将离域到苯环的电子体系上,增加了邻位和对位碳上的电荷密度,使邻位和对位碳化学位移值减小","苯环上p电子离域到硝基上,减少了邻对位碳上的电荷密度,使邻位和对位碳化学位移值增大","苯环上氢被硝基取代后,碳原子的化学位移变化是有规律的",{"answer":89,"createTime":5,"id":90,"options":91,"question":96,"source":29,"type":30},[],53102348,[92,93,94,95],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F810da2e17c755e5351152971163108eb.png\">对碳核产生耦合裂分","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1a90745515b853fd2fed9895fc358416.png\">对碳核产生耦合裂分","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F81c9c66423a0051722df91c37f372748.png\">对碳核产生耦合裂分","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0b029ce38c691624135f406eadcac61c.png\">对碳核产生耦合裂分","在\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1a90745515b853fd2fed9895fc358416.png\"> NMR中,常看到溶剂的多重峰,如氘代氯仿在77 ppm附近的三重峰.溶剂产生多重峰的原因是",{"answer":98,"createTime":5,"id":99,"options":100,"question":105,"source":29,"type":30},[],53102349,[101,102,103,104],"磁场不均匀","试样的粘度增大","增大射频辐射的功率","使自旋-自旋弛豫(横向弛豫)的速率显著增大","在下列因素中, 不会使NMR谱线变宽的因素是"]