29. Figure 7 shows the structural formulae of two organic compounds. Rajah 7 menunjukkan formula struktur bagi dua sebatian organik.
H
OH
11 - Ć=C-Ć=0
H
OI
( c¿
-&-c-6=0
Figure 7 / Rajah 7
Which of the following is true about the two compounds?
Antara berikut, yang manakah benar tentang kedua-dua sebatian itu?
A
hidrogen.
B
Both compounds react with magnesium to produce hydrogen gas.
Kedua-dua sebatian bertindak balas dengan magnesium untuk menghasilkan gas
Both compounds decolourise potassium manganate(VII).
Kedua-dua sebatian menyahwarnakan kalium manganat(VII).
Both are neutral compounds with sweet smell.
Kedua-dua merupakan sebatian neutral yang berbau harum.
Both compounds are insoluble in water.
Kedua-dua sebatian tidak terlarut dalam air.
C С
D

"the periodic table is arranged in order of atomic number."

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.