Oct-1-yne has the same number of hydrogen atoms as of __________.
A
hept-1-ene
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B
hex-1-ene
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C
pent-1-ene
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D
but-1-ene
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Solution
The correct option is A hept-1-ene Oct-1-yne has eight carbon atoms and fourteen hydrogen (H) atoms as shown. General formula for alkenes is Cn H2n. ∴ For an alkene with fourteen H atoms: 2n = 14 ⇒n=7
So, the alkene should have seven carbon atoms and fourteen hydrogen atoms. Compound No. of C atoms No. of H atoms
hept-1-ene
7
14
hex-1-ene
6
12
pent-1-ene
5
10
but-1-ene
4
8
The alkene with fourteen hydrogen atoms (same as oct-1-yne) is hept-1-ene.