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JEE Advanced levelSingle correct optionDifficulty 3 of 3si230

For the compound shown, use the molecular-formula method, DBE $= C + 1 + N /2 - (H + X) /2$ (O and S ignored). The DBE obtained is

A $3$
B $4$
C $5$
D $6$

Answer: B

The compound shown is sulfanilamide,

C X_{6} H X_{8} N X_{2} O X_{2} S

: DBE

= 6 + 1 + 1 - 4 = 4

, which is the ring plus three C=C. The S=O bonds are not counted by the formula method, so counting them as pi bonds (giving 6) is wrong here.

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