are alkynes saturated hydrocarbons? isten alkanes supposed to be saturated ? but in your mind map for hydrocarbons--it is given alkynes are saturated and alkanes are not mentioned.pleas tell me which is correct and tell me the meaning of saturated and unsaturated hydrocarbons with examples

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane