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a
CH4 > SiH4 > GeH4 > SnH4 > PbH4
b
CH4 < SiH4 < GeH4 < SnH4 < PbH4
c
CH4 > SnH4 > GeH4 > SiH4 > PbH4
d
CH4 > GeH4 > SiH4 > PbH4 > SnH4
answer is A.
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Detailed Solution
Hydride of carbon family is stable when carbon is near to nucleus, thus its attraction is more toward valence shell electron so, it is more stableCH4 > SiH4 > GeH4 > SnH4 > PbH4