2022年英语周报初二第25期3答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

21.(14分)(1)间溴乙苯(或3-溴乙苯)(1分)溴原子、碳碳双键(2分)(2)消去反应(1分)(1分)(3)B+H2化剂△COOHBHCH3(2分)COOH(4)吸收生成的HBr,提高反应的转化率(2分,答上COOH将生成的转化为COOK”不扣分)(5)12(2分)HOCH3(1分)CHO(6)CH=CHHCNH/H O催化CH2=CHCN催化剂CH,-CHCOOH七CH2CH(2分,其COOH他合理答案也给分)【解析】由信息推知,A为BH2CH3,B为BH-CH,D为B≡CH为COOH(1)A的化学名称为间溴乙苯或3-溴乙苯;B中所含官能团为溴原子、碳碳双键(2)C发生消去反应生成D;D的结构简式为BECH(3)由F生成G的化学方程式为+COOH催化剂BCHCH3OOH(4)K2CO3能吸收生成的HBr,并将生成的COOHCOOK转化为从而提高反应的转化率COOH(5)G为由信息知,其同分异构体中含有酚—OH和—CHO,苯环上的两个取代基的组合有一OH、一 CHBrCH2CHO或一OH、BrC—CH3或一OH、一CHCH2Br或一OH、CHOCHOCH2 CHCHO,4种,每种组合在苯环上的连接方式有邻、间、对3种,共12种同分异构体;其中核磁共振氢谱中有5组吸收峰的结构简式为BHOCHO(6)由信息知,CH=CH与HCN反应生成CH2=CHCN,进一步水解可生成CH2- CHCOOH,然后发生加聚反应即可得目标产物

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