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which of the ...

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which of the following will give E1CB mechanism:a)ch3-ch(f)-ch2-ch3;b)ch3-ch2-ch2-Br; c) (ch3)3c-Br; d)ch=ch-ch2-B

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Q. Select the member of each pair that shows faster rate of

S_{N} 2

K I

C H_{3} - C H_{2} - C H_{2} - C H_{2} - C l a n d C H_{3} - C H ∣ C H_{3} - C H_{2} - C l

(I) (I I)

C H_{3} - C H_{2} - C H_{2} - C l a n d C H_{3} - C H_{2} - C H_{2} - B r

(I) (I I)

C H_{3} - C H ∣ C H_{3} - C H_{2} - C H_{2} - C l a n d C H_{3} - C H_{3} ∣ C ∣ C H_{3} - C H_{2} C l

(I) (I I)

C H_{3} - C H_{2} - C H_{2} - B r ∣ C H - C H_{3} a n d C H_{3} - C H_{3} ∣ C H - C H_{2} - B r ∣ C H - C H_{3}

(I) (I I)

C H_{3} - C H_{2} - \oplus C H_{2}

C H_{3} - C H | F - \oplus C H_{2}

C H_{3} - C H | B r - \oplus C H_{2}

C H_{3} - C H | C l - \oplus C H_{2}

Arrange the following carbocations in decreasing order of their stability:

Q. The decreasing order of rate of

S_{N} 2

B r - C H_{2} - C H_{2} - B r

N = C - C H_{2} - B r

C H_{3} - C | B r H - C H_{3}

C H_{3} - C H_{2} - B r

The following reaction proceeds through which mechanism:

C H_{2} = C H_{2} + H B r \to C H_{3} - C H_{2} - B r

{CH}_{3} - {CH}_{2} - Br + {CH}_{3} - {CH}_{2} - Br Na / dry ether - ------- \to The product / s formed are

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