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JEE Main levelSingle correct optionDifficulty 2 of 3nm129

The molecular formula of bicyclo[4.4.0]decane is

A $C X_{10} H X_{18}$
B $C X_{10} H X_{20}$
C $C X_{10} H X_{16}$
D $C X_{10} H X_{22}$

Answer: A

The name gives 4 + 4 + 0 + 2 = 10 carbons. A saturated acyclic alkane would be

C X_{10} H X_{22}

; each ring removes two hydrogens, and there are two rings (bicyclic), so the formula is

C X_{10} H X_{18}

.

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