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【多选题】
下列关于羧酸的脱羧与羧基还原反应,正确的是( )A.
饱和一元脂肪酸难以脱羧，当α-碳上供电子基时，脱羧反应比较容易
B.
β-丁酮酸在加热条件下容易发生脱羧酸反应，生成丙酮和二氧化碳
C.
CH3CH=CHCOOH经催化氢化生成CH3CH2CH2CH2OH
D.
CH3CH=CHCOOH经LiAlH4和NaBH4还原，生成CH3CH=CHCH2OH
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举一反三
【单选题】We all see Deng Chao's performance skills, yet little ________ attention to his singing talent.
A.
do we pay
B.
we paid
C.
had we paid
D.
we have paid
【简答题】chao8课堂练习提交
【单选题】Mo Yan is one of _____ writers in the world.
A.
famous
B.
more famous
C.
most famous
D.
the most famous
【简答题】Upload your note of our class and Chao xing.
【简答题】根据图片所示内容填空。 1. Uncle Da Chao is my father's _______________. 2. Jing is my _______________. 3. Jing is my uncle Da Chao's _______________. 4. _______________ Mei Ping is my _______________ Da Chao's _...
【单选题】a low monthly income，Ni Chao makes up his mind to make a charity donation of l0000 yuan every year．
A.
In spite of
B.
In case of
C.
In terms of
D.
In possession of
【单选题】在卤素为离去基团的SN反应中,Br离去倾向比Cl大的原因是( )
A.
Br的电负性比Cl小
B.
Br的半径比Cl大
C.
溴离子的亲核性强
D.
C-Br键能比C-Cl键能小
【单选题】在卤素为离去基团的SN反应中,Br离去倾向比Cl大的原因是:
A.
Br 的电负性比 Cl 小
B.
Br 的半径比 Cl 大
C.
溴离子的亲核性强
D.
C-Br 键能键能比 C-Cl 键能小
【简答题】( ) Chao
【简答题】( ) Venga, chao
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