Question

Chain Isomer of pent-2-ene
is
@ 2-Methyl-but-2-ene
b 1 - Ethylprop-i-ene
Pent -3-ene
D 2-methylpentane​

Answer 1

☆Chain isomers:

》Those which has same structural and molecular formula but differs in the number of carbon atoms in parent chain.

☆Solution:

》pent-2-ene has 5 carbon atoms in its parent chain.

• molecular formula(MF)= $\ C_5 H_{10}$

a) 2-methyl-but-2-ene

• MF = $\ C_5 H_{10}$
• parent chain includes 4-carbon atoms.
• $\rm chain\;isomer$

b) 1-Ethyl prop-1-ene

• MF = $\ C_5 H_{10}$
• after rearranging it has 5-carbons in parent chain.
• $\rm identical$

c) pent-3-ene

• MF= $\ C_5 H_{10}$
• parent chain had 5carbon atoms.(rearranging)
• $\rm Position \;isomer$

d)2-methyl pentane

• MF = $\ C_6 H_{14}$
• parent chain has 6 carbon.
• $\rm Not\;any\;isomer$

☆☆Above observations and definitions we can say 2-methyl-but-2-ene is chain isomer of pent-2-ene.

----------------