Which of the following statement(s) is/are tr | vedclass

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(B) $1$. $Tertiary$ alkyl halides are sterically hindered,making $S_{N}2$ reactions extremely slow or impossible. They prefer $S_{N}1$ mechanisms.$2$.

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Alkyl iodides on exposure to sunlight gradually darken.

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(B) $1$. $Tertiary$ alkyl halides are sterically hindered,making $S_{N}2$ reactions extremely slow or impossible. They prefer $S_{N}1$ mechanisms.$2$. Alkyl iodides are photosensitive. Upon exposure to sunlight,they decompose to liberate iodine $(I_2)$,which causes them to darken.$3$. Alkyl chlorides do give a positive Beilstein test (green flame),although it is less intense than bromides or iodides.$4$. Nucleophilic substitution is easiest in alkyl iodides because the $C-I$ bond is the weakest due to the large size of the iodine atom,making $I^-$ a good leaving group.

Which of the following statement$(s)$ is/are true about alkyl halides?

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Observe the following reactions. The order of reactivity of $x, y, z$ towards $S_{N}1$ reaction is:

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$(R)$ $CH_3-O-CH_2-CH_2-Cl$
$(S)$ $C_6H_5-CH_2-Cl$

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