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Question

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.

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