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( a ) Draw the skeletal structure of following compounds: [ Lukiskan struktur rangka bagi sebatian - sebatian berikut: ] ( i ) Isohexane. [
a Draw the skeletal structure of following compounds:
Lukiskan struktur rangka bagi sebatiansebatian berikut:
i Isohexane.
Isoheksana
MarkMarkah
iibromochloromethylcyclohexane.
bromoklorometilsikloheksana.
MarkMarkah
iiimethylethylnonane
Imetiletilnonana
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ivtrimethylpentane.
trimetilpentana.
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b Alkane is a hydrocarbon that has only single bonds. The boiling point of an alkane depends on the strength of the attractive force between the individual molecules. Alkana merupakan hidrokarbon yang mempunyai hanya ikatan tunggal. Takat didih alkana bergantung kepada kekuatan daya tarikan antara molekul individu.
i Explain about the attractive force that held together alkane molecules.
Terangkan tentang daya tarikan yang memegang molekul alkana.
MarksMarkah
ii Hexane and dimethylbutane has similar molecular weight but different boiling point. Predict which one has lower boiling point and justify your answer.
Heksana dan dimetilbutana mempunyai berat molekul yang sama tetapi takat didih yang berbeza. Jangkakan yang manakah mempunyai takat didih yang lebih rendah dan justifikasikan jawapan anda.
MarksMarkah
c The different spatial arrangements of the atoms that result from rotation about a single bond are called conformational isomers. Chemists commonly use Newman projections to represent the threedimensional structures that result from rotation about a sigma bond.
Perbezaan susunan ruang atomatom hasil daripada putaran pada ikatan tunggal dikenali sebagai isomerisma konformasi. Kebiasaannya ahli kimia menggunakan unjuran Newman untuk mewakili struktur tiga dimensi yang terhasil daripada putaran pada ikatan sigma.
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