for part b）why do we write AlCl3 at top of the arrow and AlCl4 at the bottom of arrow？？is it any connection between the two？does it means that AlCl 4 need to be present in order to make AlCl3 reacts to the molecule and make the reaction to process？？ 2. why when AlCl3 added，Cl was removed from the ring？what princeiple theory is that ？ 2. when SO3 is added ，SO3 attached to the ring，why ？what principle is behind this phenamonane 3.Just confused about why AlCl3 removes Cl from the ring，while HSO3 donate SO3 to the ring. Is it Something about nucleohilic or eletrciohillic？

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Alkanes and Cycloalkanes

Alkanes are saturated organic compounds which are made up of C and H atoms. Alkanes have the general formula of CnH2n+2. Alkane contains sp3 hybridized carbon atoms with four sigmas (σ) bonds & every hydrogen atom is connected with one of the carbon atoms. The size of the alkane could be determined by the number of carbon atoms located in it.