102年普考環化-(氯)碳氫化合物 - 普考
By Delia
at 2013-09-22T18:55
at 2013-09-22T18:55
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
【考題出處:102年普考環境化學概要】
【題目】有五種(氯)碳氫化合物,其分子式分別如下:
CCl4,CH2Cl2,CCl3CCl3,CHClCCl2,CH2CHCl,
請列出五種化合物在環境中氧化分解最難至最易之排序,並說明理由。
(20 分)
【想法】
1.這題得"0分",冏
2.我的寫法如下,不知道是哪邊錯了?
(1)以結構是否容易產生自由基,產生越多自由基者,越難被氧化分解,
來作說明。
a.結構有雙鍵較單鍵難氧化分解
CHClCCl2, CH2CHCl > CCl3CCl3 ,CH2Cl2,CCl4
b.結構碳數越多越難分解
CCl3CCl3 > CH2Cl2,CCl4
c.氯取代基越多越難分解
CCl4 > CH2Cl2
CHClCCl2 > CH2CHCl
(2)在環境中氧化分解最難至最易之排序
CHClCCl2, CH2CHCl , CCl3CCl3 ,CCl4,CH2Cl2
若您方便的話,還盼不吝解惑,謝謝您 ^^ 祝您 心想事成
-
※ 編輯: sandy18932 來自: 219.84.116.48 (09/22 18:56)
【考題出處:102年普考環境化學概要】
【題目】有五種(氯)碳氫化合物,其分子式分別如下:
CCl4,CH2Cl2,CCl3CCl3,CHClCCl2,CH2CHCl,
請列出五種化合物在環境中氧化分解最難至最易之排序,並說明理由。
(20 分)
【想法】
1.這題得"0分",冏
2.我的寫法如下,不知道是哪邊錯了?
(1)以結構是否容易產生自由基,產生越多自由基者,越難被氧化分解,
來作說明。
a.結構有雙鍵較單鍵難氧化分解
CHClCCl2, CH2CHCl > CCl3CCl3 ,CH2Cl2,CCl4
b.結構碳數越多越難分解
CCl3CCl3 > CH2Cl2,CCl4
c.氯取代基越多越難分解
CCl4 > CH2Cl2
CHClCCl2 > CH2CHCl
(2)在環境中氧化分解最難至最易之排序
CHClCCl2, CH2CHCl , CCl3CCl3 ,CCl4,CH2Cl2
若您方便的話,還盼不吝解惑,謝謝您 ^^ 祝您 心想事成
-
※ 編輯: sandy18932 來自: 219.84.116.48 (09/22 18:56)
→ davy60205:我拿3分...沒想到有人比我更慘 09/22 19:16
→ davy60205:我拿3分...沒想到有人比我更慘,看榜首願不願意出手相救 09/22 19:18
→ davy60205:我寫的順序是CHClCCl2>CH2CHCl>CCl3CCl3>CCl4>CH2Cl2 09/22 19:36
→ sandy18932:對不起,一時手誤,我的答案跟davy60205大大相同^^" 09/22 19:47
→ sandy18932:明明(1)C就已經寫CCl4 > CH2Cl2還寫錯>__< 09/22 19:49
※ 編輯: sandy18932 來自: 219.84.116.48 (09/22 19:50) → sandy18932:已更正,感謝davy60205大大的回應 ^^ 09/22 19:51
→ davy60205:我和妳寫的差不多,僅僅多畫了5個結構式出來 09/22 19:57
推 davy60205:考委這次評考卷有點狠...寫錯幾乎連墨水分數都不太給 09/22 20:00
推 Ghosts:是ㄉ~今年閱卷老師還挺嚴~我也兩三題0分 09/22 20:02
→ sandy18932:謝謝Ghosts大大的回應 ^^ 09/22 20:22
→ davy60205:斗膽猜一下是不是第二題和第三題@_+ 09/22 20:42
推 bohow1015:看到瞬間的想法是氯接越多越難分解(?) 09/22 21:16
→ bohow1015:沒看到有寫第二點了= = SORRY 09/22 21:20
推 gogobird6253:我4分.... 09/22 21:22
推 thisjay:我也0分...... 09/22 21:25
推 azuldd:我是從氧化數方向思考...拿一半分數 09/22 22:20
→ sandy18932:謝謝bohow1015,gogobird6253,thisjay,azuldd大大們回應 09/23 07:05
→ taruru:我拿19分,順序CHClCCl2>CH2Cl2>CH2CHCl>CCl4CCl4>CCl4 09/23 14:05
→ taruru:判定是雙鍵的有無跟Cl的數量,CH2Cl2我寫的時候是有雙鍵的 09/23 14:06
→ taruru:另外就是我有把五個簡易結構式寫出來,標出雙鍵.大概就這樣 09/23 14:08
推 blue497:我的判斷方法也是看雙鍵和Cl數,但我CH2Cl2是寫畫單鍵的結 09/23 15:31
→ blue497:構,然後因為CCl3CCl3的Cl數,比CCl4多,所以我判定前者比較 09/23 15:32
→ blue497:難分解,所以得0分= =,懇請樓上t大賜教!!! 09/23 15:34
→ taruru:CH2CCl2要有雙鍵結構才會比較穩定,如果兩個碳C-C之間為單鍵 09/23 15:44
→ taruru:兩個碳會各有一個電子沒有配對,而C=C則會將碳的4個電子 09/23 15:45
→ taruru:都形成鍵結,所以會形成穩定的結構,因此我覺得CH2CCl有雙鍵 09/23 15:46
→ taruru:Sorry,鬼打牆看錯了,我回一篇新的文講解好了 09/23 15:58
→ sandy18932:真是太感謝taruru大大!!祝您 一切順心 心想事成喔 ^^ 09/23 20:36
推 kenopy:是PCE、TCE、DCE、VC嗎?屬地下水處理很有挑戰性的污染物 09/23 22:39
→ sandy18932:謝謝 kenopy大大的回應,祝您 順心 ^^ 10/04 18:12
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