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2-bromopentane is heated with postassium...

2-bromopentane is heated with postassium ethoxide in ethano1 The major product obtained is .

A

Pentene-1

B

cis pentene-2

C

trans pentene-2

D

2-ethoxypentane

Text Solution

Verified by Experts

The correct Answer is:
C
`CH_3-underset(Br)underset(|)(CH)-CH_2-CH_2-CH_3-KOH overset(C_2H_5OH)underset("Elimination reaction")(rarr)underset("2-pentene")CH_3-CH=CH-CH_2-CH_3`
When alkyl halide reacts with alc. KOH then it favours elimination reaction (Dehydrohalogenation). Since, trans pent-2-ene is more symmetrical than cis isomers. Hence, it is main product.
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Knowledge Check

  • 2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is

    A
    pent-1-ene
    B
    cis pent-2-ene
    C
    trans-pent-2-ene
    D
    2-ethoxypentane

  • 1 -Bromobutane is treated with sodium ethoxide in ethanol. The major product obrained is

    A
    trans-but-`2`-ene
    B
    cis-But-`2`-ene
    C
    but-`1`-ene
    D
    `1`-ethoxybutane

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